Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6

* 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6:
  [S390] Poison init section before freeing it.
  [S390] Use add_active_range() and free_area_init_nodes().
  [S390] Virtual memmap for s390.
  [S390] Update documentation for dynamic subchannel mapping.
  [S390] Use dev->groups for adding/removing the subchannel attribute group.
  [S390] Support for disconnected devices reappearing on another subchannel.
  [S390] subchannel lock conversion.
  [S390] Some preparations for the dynamic subchannel mapping patch.
  [S390] runtime switch for qdio performance statistics
  [S390] New DASD feature for ERP related logging
  [S390] add reset call handler to the ap bus.
  [S390] more workqueue fixes.
  [S390] workqueue fixes.
  [S390] uaccess_pt: add missing down_read() and convert to is_init().

22 files changed, 777 insertions, 378 deletions

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 2af2d9b53d1..492b68bcd7c 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -1050,10 +1050,10 @@ dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
                 }
         } else {                /* error */
                 memcpy(&cqr->irb, irb, sizeof (struct irb));
-#ifdef ERP_DEBUG
-                /* dump sense data */
-                dasd_log_sense(cqr, irb);
-#endif
+                if (device->features & DASD_FEATURE_ERPLOG) {
+                        /* dump sense data */
+                        dasd_log_sense(cqr, irb);
+                }
                 switch (era) {
                 case dasd_era_fatal:
                         cqr->status = DASD_CQR_FAILED;
diff --git a/drivers/s390/block/dasd_3990_erp.c b/drivers/s390/block/dasd_3990_erp.c
index 669805d4402..4d01040c2c6 100644
--- a/drivers/s390/block/dasd_3990_erp.c
+++ b/drivers/s390/block/dasd_3990_erp.c
@@ -2641,14 +2641,12 @@ dasd_3990_erp_action(struct dasd_ccw_req * cqr)
         struct dasd_ccw_req *erp = NULL;
         struct dasd_device *device = cqr->device;
         __u32 cpa = cqr->irb.scsw.cpa;
+        struct dasd_ccw_req *temp_erp = NULL;
 
-#ifdef ERP_DEBUG
-        /* print current erp_chain */
-        DEV_MESSAGE(KERN_ERR, device, "%s",
-                    "ERP chain at BEGINNING of ERP-ACTION");
-        {
-                struct dasd_ccw_req *temp_erp = NULL;
-
+        if (device->features & DASD_FEATURE_ERPLOG) {
+                /* print current erp_chain */
+                DEV_MESSAGE(KERN_ERR, device, "%s",
+                            "ERP chain at BEGINNING of ERP-ACTION");
                 for (temp_erp = cqr;
                      temp_erp != NULL; temp_erp = temp_erp->refers) {
 
@@ -2658,7 +2656,6 @@ dasd_3990_erp_action(struct dasd_ccw_req * cqr)
                                     temp_erp->refers);
                 }
         }
-#endif                          /* ERP_DEBUG */
 
         /* double-check if current erp/cqr was successfull */
         if ((cqr->irb.scsw.cstat == 0x00) &&
@@ -2695,11 +2692,10 @@ dasd_3990_erp_action(struct dasd_ccw_req * cqr)
                 erp = dasd_3990_erp_handle_match_erp(cqr, erp);
         }
 
-#ifdef ERP_DEBUG
-        /* print current erp_chain */
-        DEV_MESSAGE(KERN_ERR, device, "%s", "ERP chain at END of ERP-ACTION");
-        {
-                struct dasd_ccw_req *temp_erp = NULL;
+        if (device->features & DASD_FEATURE_ERPLOG) {
+                /* print current erp_chain */
+                DEV_MESSAGE(KERN_ERR, device, "%s",
+                            "ERP chain at END of ERP-ACTION");
                 for (temp_erp = erp;
                      temp_erp != NULL; temp_erp = temp_erp->refers) {
 
@@ -2709,7 +2705,6 @@ dasd_3990_erp_action(struct dasd_ccw_req * cqr)
                                     temp_erp->refers);
                 }
         }
-#endif                          /* ERP_DEBUG */
 
         if (erp->status == DASD_CQR_FAILED)
                 dasd_log_ccw(erp, 1, cpa);
diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c
index cf28ccc5794..5943266152f 100644
--- a/drivers/s390/block/dasd_devmap.c
+++ b/drivers/s390/block/dasd_devmap.c
@@ -202,6 +202,8 @@ dasd_feature_list(char *str, char **endp)
                         features |= DASD_FEATURE_READONLY;
                 else if (len == 4 && !strncmp(str, "diag", 4))
                         features |= DASD_FEATURE_USEDIAG;
+                else if (len == 6 && !strncmp(str, "erplog", 6))
+                        features |= DASD_FEATURE_ERPLOG;
                 else {
                         MESSAGE(KERN_WARNING,
                                 "unsupported feature: %*s, "
@@ -709,6 +711,52 @@ dasd_ro_store(struct device *dev, struct device_attribute *attr,
 }
 
 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
+/*
+ * erplog controls the logging of ERP related data
+ * (e.g. failing channel programs).
+ */
+static ssize_t
+dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct dasd_devmap *devmap;
+        int erplog;
+
+        devmap = dasd_find_busid(dev->bus_id);
+        if (!IS_ERR(devmap))
+                erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
+        else
+                erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
+        return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
+}
+
+static ssize_t
+dasd_erplog_store(struct device *dev, struct device_attribute *attr,
+              const char *buf, size_t count)
+{
+        struct dasd_devmap *devmap;
+        int val;
+        char *endp;
+
+        devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
+        if (IS_ERR(devmap))
+                return PTR_ERR(devmap);
+
+        val = simple_strtoul(buf, &endp, 0);
+        if (((endp + 1) < (buf + count)) || (val > 1))
+                return -EINVAL;
+
+        spin_lock(&dasd_devmap_lock);
+        if (val)
+                devmap->features |= DASD_FEATURE_ERPLOG;
+        else
+                devmap->features &= ~DASD_FEATURE_ERPLOG;
+        if (devmap->device)
+                devmap->device->features = devmap->features;
+        spin_unlock(&dasd_devmap_lock);
+        return count;
+}
+
+static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
 
 /*
  * use_diag controls whether the driver should use diag rather than ssch
@@ -896,6 +944,7 @@ static struct attribute * dasd_attrs[] = {
         &dev_attr_uid.attr,
         &dev_attr_use_diag.attr,
         &dev_attr_eer_enabled.attr,
+        &dev_attr_erplog.attr,
         NULL,
 };
 
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h
index dc5dd509434..fb725e3b08f 100644
--- a/drivers/s390/block/dasd_int.h
+++ b/drivers/s390/block/dasd_int.h
@@ -13,10 +13,6 @@
 
 #ifdef __KERNEL__
 
-/* erp debugging in dasd.c and dasd_3990_erp.c */
-#define ERP_DEBUG
-
-
 /* we keep old device allocation scheme; IOW, minors are still in 0..255 */
 #define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS))
 #define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1)
diff --git a/drivers/s390/char/ctrlchar.c b/drivers/s390/char/ctrlchar.c
index 49e9628d929..c6cbcb3f925 100644
--- a/drivers/s390/char/ctrlchar.c
+++ b/drivers/s390/char/ctrlchar.c
@@ -16,14 +16,15 @@
 
 #ifdef CONFIG_MAGIC_SYSRQ
 static int ctrlchar_sysrq_key;
+static struct tty_struct *sysrq_tty;
 
 static void
-ctrlchar_handle_sysrq(void *tty)
+ctrlchar_handle_sysrq(struct work_struct *work)
 {
-        handle_sysrq(ctrlchar_sysrq_key, (struct tty_struct *) tty);
+        handle_sysrq(ctrlchar_sysrq_key, sysrq_tty);
 }
 
-static DECLARE_WORK(ctrlchar_work, ctrlchar_handle_sysrq, NULL);
+static DECLARE_WORK(ctrlchar_work, ctrlchar_handle_sysrq);
 #endif
 
 
@@ -53,7 +54,7 @@ ctrlchar_handle(const unsigned char *buf, int len, struct tty_struct *tty)
         /* racy */
         if (len == 3 && buf[1] == '-') {
                 ctrlchar_sysrq_key = buf[2];
-                ctrlchar_work.data = tty;
+                sysrq_tty = tty;
                 schedule_work(&ctrlchar_work);
                 return CTRLCHAR_SYSRQ;
         }
diff --git a/drivers/s390/char/tape.h b/drivers/s390/char/tape.h
index 1f4c89967be..c9f1c4c8bb1 100644
--- a/drivers/s390/char/tape.h
+++ b/drivers/s390/char/tape.h
@@ -179,6 +179,7 @@ struct tape_char_data {
 /* Block Frontend Data */
 struct tape_blk_data
 {
+        struct tape_device *    device;
         /* Block device request queue. */
         request_queue_t *       request_queue;
         spinlock_t              request_queue_lock;
@@ -240,7 +241,7 @@ struct tape_device {
 #endif
 
         /* Function to start or stop the next request later. */
-        struct work_struct              tape_dnr;
+        struct delayed_work             tape_dnr;
 };
 
 /* Externals from tape_core.c */
diff --git a/drivers/s390/char/tape_34xx.c b/drivers/s390/char/tape_34xx.c
index 7b95dab913d..e765875e8db 100644
--- a/drivers/s390/char/tape_34xx.c
+++ b/drivers/s390/char/tape_34xx.c
@@ -95,6 +95,12 @@ tape_34xx_medium_sense(struct tape_device *device)
         return rc;
 }
 
+struct tape_34xx_work {
+        struct tape_device      *device;
+        enum tape_op             op;
+        struct work_struct       work;
+};
+
 /*
  * These functions are currently used only to schedule a medium_sense for
  * later execution. This is because we get an interrupt whenever a medium
@@ -103,13 +109,10 @@ tape_34xx_medium_sense(struct tape_device *device)
  * interrupt handler.
  */
 static void
-tape_34xx_work_handler(void *data)
+tape_34xx_work_handler(struct work_struct *work)
 {
-        struct {
-                struct tape_device      *device;
-                enum tape_op             op;
-                struct work_struct       work;
-        } *p = data;
+        struct tape_34xx_work *p =
+                container_of(work, struct tape_34xx_work, work);
 
         switch(p->op) {
                 case TO_MSEN:
@@ -126,17 +129,13 @@ tape_34xx_work_handler(void *data)
 static int
 tape_34xx_schedule_work(struct tape_device *device, enum tape_op op)
 {
-        struct {
-                struct tape_device      *device;
-                enum tape_op             op;
-                struct work_struct       work;
-        } *p;
+        struct tape_34xx_work *p;
 
         if ((p = kmalloc(sizeof(*p), GFP_ATOMIC)) == NULL)
                 return -ENOMEM;
 
         memset(p, 0, sizeof(*p));
-        INIT_WORK(&p->work, tape_34xx_work_handler, p);
+        INIT_WORK(&p->work, tape_34xx_work_handler);
 
         p->device = tape_get_device_reference(device);
         p->op     = op;
diff --git a/drivers/s390/char/tape_3590.c b/drivers/s390/char/tape_3590.c
index 928cbefc49d..9df912f6318 100644
--- a/drivers/s390/char/tape_3590.c
+++ b/drivers/s390/char/tape_3590.c
@@ -236,9 +236,10 @@ struct work_handler_data {
 };
 
 static void
-tape_3590_work_handler(void *data)
+tape_3590_work_handler(struct work_struct *work)
 {
-        struct work_handler_data *p = data;
+        struct work_handler_data *p =
+                container_of(work, struct work_handler_data, work);
 
         switch (p->op) {
         case TO_MSEN:
@@ -263,7 +264,7 @@ tape_3590_schedule_work(struct tape_device *device, enum tape_op op)
         if ((p = kzalloc(sizeof(*p), GFP_ATOMIC)) == NULL)
                 return -ENOMEM;
 
-        INIT_WORK(&p->work, tape_3590_work_handler, p);
+        INIT_WORK(&p->work, tape_3590_work_handler);
 
         p->device = tape_get_device_reference(device);
         p->op = op;
diff --git a/drivers/s390/char/tape_block.c b/drivers/s390/char/tape_block.c
index 3225fcd1dcb..c8a89b3b87d 100644
--- a/drivers/s390/char/tape_block.c
+++ b/drivers/s390/char/tape_block.c
@@ -15,6 +15,7 @@
 #include <linux/blkdev.h>
 #include <linux/interrupt.h>
 #include <linux/buffer_head.h>
+#include <linux/kernel.h>
 
 #include <asm/debug.h>
 
@@ -143,7 +144,8 @@ tapeblock_start_request(struct tape_device *device, struct request *req)
  * queue.
  */
 static void
-tapeblock_requeue(void *data) {
+tapeblock_requeue(struct work_struct *work) {
+        struct tape_blk_data *  blkdat;
         struct tape_device *    device;
         request_queue_t *       queue;
         int                     nr_queued;
@@ -151,7 +153,8 @@ tapeblock_requeue(void *data) {
         struct list_head *      l;
         int                     rc;
 
-        device = (struct tape_device *) data;
+        blkdat = container_of(work, struct tape_blk_data, requeue_task);
+        device = blkdat->device;
         if (!device)
                 return;
 
@@ -212,6 +215,7 @@ tapeblock_setup_device(struct tape_device * device)
         int                     rc;
 
         blkdat = &device->blk_data;
+        blkdat->device = device;
         spin_lock_init(&blkdat->request_queue_lock);
         atomic_set(&blkdat->requeue_scheduled, 0);
 
@@ -255,8 +259,8 @@ tapeblock_setup_device(struct tape_device * device)
 
         add_disk(disk);
 
-        INIT_WORK(&blkdat->requeue_task, tapeblock_requeue,
-                tape_get_device_reference(device));
+        tape_get_device_reference(device);
+        INIT_WORK(&blkdat->requeue_task, tapeblock_requeue);
 
         return 0;
 
@@ -271,7 +275,7 @@ void
 tapeblock_cleanup_device(struct tape_device *device)
 {
         flush_scheduled_work();
-        device->blk_data.requeue_task.data = tape_put_device(device);
+        tape_put_device(device);
 
         if (!device->blk_data.disk) {
                 PRINT_ERR("(%s): No gendisk to clean up!\n",
diff --git a/drivers/s390/char/tape_core.c b/drivers/s390/char/tape_core.c
index 2826aed9104..c6c2e918b99 100644
--- a/drivers/s390/char/tape_core.c
+++ b/drivers/s390/char/tape_core.c
@@ -28,7 +28,7 @@
 #define PRINTK_HEADER "TAPE_CORE: "
 
 static void __tape_do_irq (struct ccw_device *, unsigned long, struct irb *);
-static void tape_delayed_next_request(void * data);
+static void tape_delayed_next_request(struct work_struct *);
 
 /*
  * One list to contain all tape devices of all disciplines, so
@@ -272,7 +272,7 @@ __tape_cancel_io(struct tape_device *device, struct tape_request *request)
                                 return 0;
                         case -EBUSY:
                                 request->status = TAPE_REQUEST_CANCEL;
-                                schedule_work(&device->tape_dnr);
+                                schedule_delayed_work(&device->tape_dnr, 0);
                                 return 0;
                         case -ENODEV:
                                 DBF_EXCEPTION(2, "device gone, retry\n");
@@ -470,7 +470,7 @@ tape_alloc_device(void)
         *device->modeset_byte = 0;
         device->first_minor = -1;
         atomic_set(&device->ref_count, 1);
-        INIT_WORK(&device->tape_dnr, tape_delayed_next_request, device);
+        INIT_DELAYED_WORK(&device->tape_dnr, tape_delayed_next_request);
 
         return device;
 }
@@ -724,7 +724,7 @@ __tape_start_io(struct tape_device *device, struct tape_request *request)
         } else if (rc == -EBUSY) {
                 /* The common I/O subsystem is currently busy. Retry later. */
                 request->status = TAPE_REQUEST_QUEUED;
-                schedule_work(&device->tape_dnr);
+                schedule_delayed_work(&device->tape_dnr, 0);
                 rc = 0;
         } else {
                 /* Start failed. Remove request and indicate failure. */
@@ -790,11 +790,11 @@ __tape_start_next_request(struct tape_device *device)
 }
 
 static void
-tape_delayed_next_request(void *data)
+tape_delayed_next_request(struct work_struct *work)
 {
-        struct tape_device *    device;
+        struct tape_device *device =
+                container_of(work, struct tape_device, tape_dnr.work);
 
-        device = (struct tape_device *) data;
         DBF_LH(6, "tape_delayed_next_request(%p)\n", device);
         spin_lock_irq(get_ccwdev_lock(device->cdev));
         __tape_start_next_request(device);
diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c
index dbfb77b0392..cbab8d2ce5c 100644
--- a/drivers/s390/cio/chsc.c
+++ b/drivers/s390/cio/chsc.c
@@ -183,7 +183,7 @@ css_get_ssd_info(struct subchannel *sch)
         page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
         if (!page)
                 return -ENOMEM;
-        spin_lock_irq(&sch->lock);
+        spin_lock_irq(sch->lock);
         ret = chsc_get_sch_desc_irq(sch, page);
         if (ret) {
                 static int cio_chsc_err_msg;
@@ -197,7 +197,7 @@ css_get_ssd_info(struct subchannel *sch)
                         cio_chsc_err_msg = 1;
                 }
         }
-        spin_unlock_irq(&sch->lock);
+        spin_unlock_irq(sch->lock);
         free_page((unsigned long)page);
         if (!ret) {
                 int j, chpid, mask;
@@ -233,7 +233,7 @@ s390_subchannel_remove_chpid(struct device *dev, void *data)
         if (j >= 8)
                 return 0;
 
-        spin_lock_irq(&sch->lock);
+        spin_lock_irq(sch->lock);
 
         stsch(sch->schid, &schib);
         if (!schib.pmcw.dnv)
@@ -265,10 +265,10 @@ s390_subchannel_remove_chpid(struct device *dev, void *data)
         else if (sch->lpm == mask)
                 goto out_unreg;
 out_unlock:
-        spin_unlock_irq(&sch->lock);
+        spin_unlock_irq(sch->lock);
         return 0;
 out_unreg:
-        spin_unlock_irq(&sch->lock);
+        spin_unlock_irq(sch->lock);
         sch->lpm = 0;
         if (css_enqueue_subchannel_slow(sch->schid)) {
                 css_clear_subchannel_slow_list();
@@ -378,12 +378,12 @@ __s390_process_res_acc(struct subchannel_id schid, void *data)
                 /* Check if a subchannel is newly available. */
                 return s390_process_res_acc_new_sch(schid);
 
-        spin_lock_irq(&sch->lock);
+        spin_lock_irq(sch->lock);
 
         chp_mask = s390_process_res_acc_sch(res_data, sch);
 
         if (chp_mask == 0) {
-                spin_unlock_irq(&sch->lock);
+                spin_unlock_irq(sch->lock);
                 put_device(&sch->dev);
                 return 0;
         }
@@ -397,7 +397,7 @@ __s390_process_res_acc(struct subchannel_id schid, void *data)
         else if (sch->driver && sch->driver->verify)
                 sch->driver->verify(&sch->dev);
 
-        spin_unlock_irq(&sch->lock);
+        spin_unlock_irq(sch->lock);
         put_device(&sch->dev);
         return 0;
 }
@@ -635,21 +635,21 @@ __chp_add(struct subchannel_id schid, void *data)
         if (!sch)
                 /* Check if the subchannel is now available. */
                 return __chp_add_new_sch(schid);
-        spin_lock_irq(&sch->lock);
+        spin_lock_irq(sch->lock);
         for (i=0; i<8; i++) {
                 mask = 0x80 >> i;
                 if ((sch->schib.pmcw.pim & mask) &&
                     (sch->schib.pmcw.chpid[i] == chp->id)) {
                         if (stsch(sch->schid, &sch->schib) != 0) {
                                 /* Endgame. */
-                                spin_unlock_irq(&sch->lock);
+                                spin_unlock_irq(sch->lock);
                                 return -ENXIO;
                         }
                         break;
                 }
         }
         if (i==8) {
-                spin_unlock_irq(&sch->lock);
+                spin_unlock_irq(sch->lock);
                 return 0;
         }
         sch->lpm = ((sch->schib.pmcw.pim &
@@ -660,7 +660,7 @@ __chp_add(struct subchannel_id schid, void *data)
         if (sch->driver && sch->driver->verify)
                 sch->driver->verify(&sch->dev);
 
-        spin_unlock_irq(&sch->lock);
+        spin_unlock_irq(sch->lock);
         put_device(&sch->dev);
         return 0;
 }
@@ -750,7 +750,7 @@ __s390_subchannel_vary_chpid(struct subchannel *sch, __u8 chpid, int on)
         if (!sch->ssd_info.valid)
                 return;
         
-        spin_lock_irqsave(&sch->lock, flags);
+        spin_lock_irqsave(sch->lock, flags);
         old_lpm = sch->lpm;
         for (chp = 0; chp < 8; chp++) {
                 if (sch->ssd_info.chpid[chp] != chpid)
@@ -785,7 +785,7 @@ __s390_subchannel_vary_chpid(struct subchannel *sch, __u8 chpid, int on)
                         sch->driver->verify(&sch->dev);
                 break;
         }
-        spin_unlock_irqrestore(&sch->lock, flags);
+        spin_unlock_irqrestore(sch->lock, flags);
 }
 
 static int
diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index 20aee278384..7835a714a40 100644
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -143,11 +143,11 @@ cio_tpi(void)
                 return 1;
         local_bh_disable();
         irq_enter ();
-        spin_lock(&sch->lock);
+        spin_lock(sch->lock);
         memcpy (&sch->schib.scsw, &irb->scsw, sizeof (struct scsw));
         if (sch->driver && sch->driver->irq)
                 sch->driver->irq(&sch->dev);
-        spin_unlock(&sch->lock);
+        spin_unlock(sch->lock);
         irq_exit ();
         _local_bh_enable();
         return 1;
@@ -415,6 +415,8 @@ cio_enable_subchannel (struct subchannel *sch, unsigned int isc)
         CIO_TRACE_EVENT (2, "ensch");
         CIO_TRACE_EVENT (2, sch->dev.bus_id);
 
+        if (sch_is_pseudo_sch(sch))
+                return -EINVAL;
         ccode = stsch (sch->schid, &sch->schib);
         if (ccode)
                 return -ENODEV;
@@ -462,6 +464,8 @@ cio_disable_subchannel (struct subchannel *sch)
         CIO_TRACE_EVENT (2, "dissch");
         CIO_TRACE_EVENT (2, sch->dev.bus_id);
 
+        if (sch_is_pseudo_sch(sch))
+                return 0;
         ccode = stsch (sch->schid, &sch->schib);
         if (ccode == 3)         /* Not operational. */
                 return -ENODEV;
@@ -496,6 +500,15 @@ cio_disable_subchannel (struct subchannel *sch)
         return ret;
 }
 
+int cio_create_sch_lock(struct subchannel *sch)
+{
+        sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL);
+        if (!sch->lock)
+                return -ENOMEM;
+        spin_lock_init(sch->lock);
+        return 0;
+}
+
 /*
  * cio_validate_subchannel()
  *
@@ -513,6 +526,7 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
 {
         char dbf_txt[15];
         int ccode;
+        int err;
 
         sprintf (dbf_txt, "valsch%x", schid.sch_no);
         CIO_TRACE_EVENT (4, dbf_txt);
@@ -520,9 +534,15 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
         /* Nuke all fields. */
         memset(sch, 0, sizeof(struct subchannel));
 
-        spin_lock_init(&sch->lock);
+        sch->schid = schid;
+        if (cio_is_console(schid)) {
+                sch->lock = cio_get_console_lock();
+        } else {
+                err = cio_create_sch_lock(sch);
+                if (err)
+                        goto out;
+        }
         mutex_init(&sch->reg_mutex);
-
         /* Set a name for the subchannel */
         snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid,
                   schid.sch_no);
@@ -534,10 +554,10 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
          *  is not valid.
          */
         ccode = stsch_err (schid, &sch->schib);
-        if (ccode)
-                return (ccode == 3) ? -ENXIO : ccode;
-
-        sch->schid = schid;
+        if (ccode) {
+                err = (ccode == 3) ? -ENXIO : ccode;
+                goto out;
+        }
         /* Copy subchannel type from path management control word. */
         sch->st = sch->schib.pmcw.st;
 
@@ -550,14 +570,16 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
                           "non-I/O subchannel type %04X\n",
                           sch->schid.ssid, sch->schid.sch_no, sch->st);
                 /* We stop here for non-io subchannels. */
-                return sch->st;
+                err = sch->st;
+                goto out;
         }
 
         /* Initialization for io subchannels. */
-        if (!sch->schib.pmcw.dnv)
+        if (!sch->schib.pmcw.dnv) {
                 /* io subchannel but device number is invalid. */
-                return -ENODEV;
-
+                err = -ENODEV;
+                goto out;
+        }
         /* Devno is valid. */
         if (is_blacklisted (sch->schid.ssid, sch->schib.pmcw.dev)) {
                 /*
@@ -567,7 +589,8 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
                 CIO_MSG_EVENT(0, "Blacklisted device detected "
                               "at devno %04X, subchannel set %x\n",
                               sch->schib.pmcw.dev, sch->schid.ssid);
-                return -ENODEV;
+                err = -ENODEV;
+                goto out;
         }
         sch->opm = 0xff;
         if (!cio_is_console(sch->schid))
@@ -595,6 +618,11 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
         if ((sch->lpm & (sch->lpm - 1)) != 0)
                 sch->schib.pmcw.mp = 1; /* multipath mode */
         return 0;
+out:
+        if (!cio_is_console(schid))
+                kfree(sch->lock);
+        sch->lock = NULL;
+        return err;
 }
 
 /*
@@ -637,7 +665,7 @@ do_IRQ (struct pt_regs *regs)
                 }
                 sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
                 if (sch)
-                        spin_lock(&sch->lock);
+                        spin_lock(sch->lock);
                 /* Store interrupt response block to lowcore. */
                 if (tsch (tpi_info->schid, irb) == 0 && sch) {
                         /* Keep subchannel information word up to date. */
@@ -648,7 +676,7 @@ do_IRQ (struct pt_regs *regs)
                                 sch->driver->irq(&sch->dev);
                 }
                 if (sch)
-                        spin_unlock(&sch->lock);
+                        spin_unlock(sch->lock);
                 /*
                  * Are more interrupts pending?
                  * If so, the tpi instruction will update the lowcore
@@ -687,10 +715,10 @@ wait_cons_dev (void)
         __ctl_load (cr6, 6, 6);
 
         do {
-                spin_unlock(&console_subchannel.lock);
+                spin_unlock(console_subchannel.lock);
                 if (!cio_tpi())
                         cpu_relax();
-                spin_lock(&console_subchannel.lock);
+                spin_lock(console_subchannel.lock);
         } while (console_subchannel.schib.scsw.actl != 0);
         /*
          * restore previous isc value
diff --git a/drivers/s390/cio/cio.h b/drivers/s390/cio/cio.h
index 4541c1af4b6..35154a21035 100644
--- a/drivers/s390/cio/cio.h
+++ b/drivers/s390/cio/cio.h
@@ -87,7 +87,7 @@ struct orb {
 /* subchannel data structure used by I/O subroutines */
 struct subchannel {
         struct subchannel_id schid;
-        spinlock_t lock;        /* subchannel lock */
+        spinlock_t *lock;       /* subchannel lock */
         struct mutex reg_mutex;
         enum {
                 SUBCHANNEL_TYPE_IO = 0,
@@ -131,15 +131,19 @@ extern int cio_set_options (struct subchannel *, int);
 extern int cio_get_options (struct subchannel *);
 extern int cio_modify (struct subchannel *);
 
+int cio_create_sch_lock(struct subchannel *);
+
 /* Use with care. */
 #ifdef CONFIG_CCW_CONSOLE
 extern struct subchannel *cio_probe_console(void);
 extern void cio_release_console(void);
 extern int cio_is_console(struct subchannel_id);
 extern struct subchannel *cio_get_console_subchannel(void);
+extern spinlock_t * cio_get_console_lock(void);
 #else
 #define cio_is_console(schid) 0
 #define cio_get_console_subchannel() NULL
+#define cio_get_console_lock() NULL;
 #endif
 
 extern int cio_show_msg;
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 26cf2f5ae2e..4c81d890791 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -91,9 +91,9 @@ css_free_subchannel(struct subchannel *sch)
                 /* Reset intparm to zeroes. */
                 sch->schib.pmcw.intparm = 0;
                 cio_modify(sch);
+                kfree(sch->lock);
                 kfree(sch);
         }
-        
 }
 
 static void
@@ -102,8 +102,10 @@ css_subchannel_release(struct device *dev)
         struct subchannel *sch;
 
         sch = to_subchannel(dev);
-        if (!cio_is_console(sch->schid))
+        if (!cio_is_console(sch->schid)) {
+                kfree(sch->lock);
                 kfree(sch);
+        }
 }
 
 extern int css_get_ssd_info(struct subchannel *sch);
@@ -135,14 +137,16 @@ css_register_subchannel(struct subchannel *sch)
         sch->dev.parent = &css[0]->device;
         sch->dev.bus = &css_bus_type;
         sch->dev.release = &css_subchannel_release;
-        
+        sch->dev.groups = subch_attr_groups;
+
         /* make it known to the system */
         ret = css_sch_device_register(sch);
-        if (ret)
+        if (ret) {
                 printk (KERN_WARNING "%s: could not register %s\n",
                         __func__, sch->dev.bus_id);
-        else
-                css_get_ssd_info(sch);
+                return ret;
+        }
+        css_get_ssd_info(sch);
         return ret;
 }
 
@@ -201,18 +205,18 @@ static int css_evaluate_known_subchannel(struct subchannel *sch, int slow)
         unsigned long flags;
         enum { NONE, UNREGISTER, UNREGISTER_PROBE, REPROBE } action;
 
-        spin_lock_irqsave(&sch->lock, flags);
+        spin_lock_irqsave(sch->lock, flags);
         disc = device_is_disconnected(sch);
         if (disc && slow) {
                 /* Disconnected devices are evaluated directly only.*/
-                spin_unlock_irqrestore(&sch->lock, flags);
+                spin_unlock_irqrestore(sch->lock, flags);
                 return 0;
         }
         /* No interrupt after machine check - kill pending timers. */
         device_kill_pending_timer(sch);
         if (!disc && !slow) {
                 /* Non-disconnected devices are evaluated on the slow path. */
-                spin_unlock_irqrestore(&sch->lock, flags);
+                spin_unlock_irqrestore(sch->lock, flags);
                 return -EAGAIN;
         }
         event = css_get_subchannel_status(sch);
@@ -237,9 +241,9 @@ static int css_evaluate_known_subchannel(struct subchannel *sch, int slow)
                 /* Ask driver what to do with device. */
                 action = UNREGISTER;
                 if (sch->driver && sch->driver->notify) {
-                        spin_unlock_irqrestore(&sch->lock, flags);
+                        spin_unlock_irqrestore(sch->lock, flags);
                         ret = sch->driver->notify(&sch->dev, event);
-                        spin_lock_irqsave(&sch->lock, flags);
+                        spin_lock_irqsave(sch->lock, flags);
                         if (ret)
                                 action = NONE;
                 }
@@ -264,9 +268,9 @@ static int css_evaluate_known_subchannel(struct subchannel *sch, int slow)
         case UNREGISTER:
         case UNREGISTER_PROBE:
                 /* Unregister device (will use subchannel lock). */
-                spin_unlock_irqrestore(&sch->lock, flags);
+                spin_unlock_irqrestore(sch->lock, flags);
                 css_sch_device_unregister(sch);
-                spin_lock_irqsave(&sch->lock, flags);
+                spin_lock_irqsave(sch->lock, flags);
 
                 /* Reset intparm to zeroes. */
                 sch->schib.pmcw.intparm = 0;
@@ -278,7 +282,7 @@ static int css_evaluate_known_subchannel(struct subchannel *sch, int slow)
         default:
                 break;
         }
-        spin_unlock_irqrestore(&sch->lock, flags);
+        spin_unlock_irqrestore(sch->lock, flags);
         /* Probe if necessary. */
         if (action == UNREGISTER_PROBE)
                 ret = css_probe_device(sch->schid);
@@ -573,12 +577,24 @@ css_cm_enable_store(struct device *dev, struct device_attribute *attr,
 
 static DEVICE_ATTR(cm_enable, 0644, css_cm_enable_show, css_cm_enable_store);
 
-static inline void __init
-setup_css(int nr)
+static inline int __init setup_css(int nr)
 {
         u32 tod_high;
+        int ret;
 
         memset(css[nr], 0, sizeof(struct channel_subsystem));
+        css[nr]->pseudo_subchannel =
+                kzalloc(sizeof(*css[nr]->pseudo_subchannel), GFP_KERNEL);
+        if (!css[nr]->pseudo_subchannel)
+                return -ENOMEM;
+        css[nr]->pseudo_subchannel->dev.parent = &css[nr]->device;
+        css[nr]->pseudo_subchannel->dev.release = css_subchannel_release;
+        sprintf(css[nr]->pseudo_subchannel->dev.bus_id, "defunct");
+        ret = cio_create_sch_lock(css[nr]->pseudo_subchannel);
+        if (ret) {
+                kfree(css[nr]->pseudo_subchannel);
+                return ret;
+        }
         mutex_init(&css[nr]->mutex);
         css[nr]->valid = 1;
         css[nr]->cssid = nr;
@@ -586,6 +602,7 @@ setup_css(int nr)
         css[nr]->device.release = channel_subsystem_release;
         tod_high = (u32) (get_clock() >> 32);
         css_generate_pgid(css[nr], tod_high);
+        return 0;
 }
 
 /*
@@ -622,10 +639,12 @@ init_channel_subsystem (void)
                         ret = -ENOMEM;
                         goto out_unregister;
                 }
-                setup_css(i);
-                ret = device_register(&css[i]->device);
+                ret = setup_css(i);
                 if (ret)
                         goto out_free;
+                ret = device_register(&css[i]->device);
+                if (ret)
+                        goto out_free_all;
                 if (css_characteristics_avail &&
                     css_chsc_characteristics.secm) {
                         ret = device_create_file(&css[i]->device,
@@ -633,6 +652,9 @@ init_channel_subsystem (void)
                         if (ret)
                                 goto out_device;
                 }
+                ret = device_register(&css[i]->pseudo_subchannel->dev);
+                if (ret)
+                        goto out_file;
         }
         css_init_done = 1;
 
@@ -640,13 +662,19 @@ init_channel_subsystem (void)
 
         for_each_subchannel(__init_channel_subsystem, NULL);
         return 0;
+out_file:
+        device_remove_file(&css[i]->device, &dev_attr_cm_enable);
 out_device:
         device_unregister(&css[i]->device);
+out_free_all:
+        kfree(css[i]->pseudo_subchannel->lock);
+        kfree(css[i]->pseudo_subchannel);
 out_free:
         kfree(css[i]);
 out_unregister:
         while (i > 0) {
                 i--;
+                device_unregister(&css[i]->pseudo_subchannel->dev);
                 if (css_characteristics_avail && css_chsc_characteristics.secm)
                         device_remove_file(&css[i]->device,
                                            &dev_attr_cm_enable);
@@ -658,6 +686,11 @@ out:
         return ret;
 }
 
+int sch_is_pseudo_sch(struct subchannel *sch)
+{
+        return sch == to_css(sch->dev.parent)->pseudo_subchannel;
+}
+
 /*
  * find a driver for a subchannel. They identify by the subchannel
  * type with the exception that the console subchannel driver has its own
diff --git a/drivers/s390/cio/css.h b/drivers/s390/cio/css.h
index 9ff064e7176..3464c5b875c 100644
--- a/drivers/s390/cio/css.h
+++ b/drivers/s390/cio/css.h
@@ -73,6 +73,8 @@ struct senseid {
 }  __attribute__ ((packed,aligned(4)));
 
 struct ccw_device_private {
+        struct ccw_device *cdev;
+        struct subchannel *sch;
         int state;              /* device state */
         atomic_t onoff;
         unsigned long registered;
@@ -158,6 +160,8 @@ struct channel_subsystem {
         int cm_enabled;
         void *cub_addr1;
         void *cub_addr2;
+        /* for orphaned ccw devices */
+        struct subchannel *pseudo_subchannel;
 };
 #define to_css(dev) container_of(dev, struct channel_subsystem, device)
 
@@ -185,6 +189,11 @@ void css_clear_subchannel_slow_list(void);
 int css_slow_subchannels_exist(void);
 extern int need_rescan;
 
+int sch_is_pseudo_sch(struct subchannel *);
+
 extern struct workqueue_struct *slow_path_wq;
 extern struct work_struct slow_path_work;
+
+int subchannel_add_files (struct device *);
+extern struct attribute_group *subch_attr_groups[];
 #endif
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index d3d3716ff84..803579053c2 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -23,6 +23,7 @@
 #include <asm/param.h>          /* HZ */
 
 #include "cio.h"
+#include "cio_debug.h"
 #include "css.h"
 #include "device.h"
 #include "ioasm.h"
@@ -234,9 +235,11 @@ chpids_show (struct device * dev, struct device_attribute *attr, char * buf)
         ssize_t ret = 0;
         int chp;
 
-        for (chp = 0; chp < 8; chp++)
-                ret += sprintf (buf+ret, "%02x ", ssd->chpid[chp]);
-
+        if (ssd)
+                for (chp = 0; chp < 8; chp++)
+                        ret += sprintf (buf+ret, "%02x ", ssd->chpid[chp]);
+        else
+                ret += sprintf (buf, "n/a");
         ret += sprintf (buf+ret, "\n");
         return min((ssize_t)PAGE_SIZE, ret);
 }
@@ -294,14 +297,44 @@ online_show (struct device *dev, struct device_attribute *attr, char *buf)
         return sprintf(buf, cdev->online ? "1\n" : "0\n");
 }
 
+int ccw_device_is_orphan(struct ccw_device *cdev)
+{
+        return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent));
+}
+
+static void ccw_device_unregister(struct work_struct *work)
+{
+        struct ccw_device_private *priv;
+        struct ccw_device *cdev;
+
+        priv = container_of(work, struct ccw_device_private, kick_work);
+        cdev = priv->cdev;
+        if (test_and_clear_bit(1, &cdev->private->registered))
+                device_unregister(&cdev->dev);
+        put_device(&cdev->dev);
+}
+
 static void
 ccw_device_remove_disconnected(struct ccw_device *cdev)
 {
         struct subchannel *sch;
+        unsigned long flags;
         /*
          * Forced offline in disconnected state means
          * 'throw away device'.
          */
+        if (ccw_device_is_orphan(cdev)) {
+                /* Deregister ccw device. */
+                spin_lock_irqsave(cdev->ccwlock, flags);
+                cdev->private->state = DEV_STATE_NOT_OPER;
+                spin_unlock_irqrestore(cdev->ccwlock, flags);
+                if (get_device(&cdev->dev)) {
+                        PREPARE_WORK(&cdev->private->kick_work,
+                                     ccw_device_unregister);
+                        queue_work(ccw_device_work, &cdev->private->kick_work);
+                }
+                return ;
+        }
         sch = to_subchannel(cdev->dev.parent);
         css_sch_device_unregister(sch);
         /* Reset intparm to zeroes. */
@@ -462,6 +495,8 @@ available_show (struct device *dev, struct device_attribute *attr, char *buf)
         struct ccw_device *cdev = to_ccwdev(dev);
         struct subchannel *sch;
 
+        if (ccw_device_is_orphan(cdev))
+                return sprintf(buf, "no device\n");
         switch (cdev->private->state) {
         case DEV_STATE_BOXED:
                 return sprintf(buf, "boxed\n");
@@ -498,11 +533,10 @@ static struct attribute_group subch_attr_group = {
         .attrs = subch_attrs,
 };
 
-static inline int
-subchannel_add_files (struct device *dev)
-{
-        return sysfs_create_group(&dev->kobj, &subch_attr_group);
-}
+struct attribute_group *subch_attr_groups[] = {
+        &subch_attr_group,
+        NULL,
+};
 
 static struct attribute * ccwdev_attrs[] = {
         &dev_attr_devtype.attr,
@@ -563,11 +597,10 @@ match_devno(struct device * dev, void * data)
 
         cdev = to_ccwdev(dev);
         if ((cdev->private->state == DEV_STATE_DISCONNECTED) &&
+            !ccw_device_is_orphan(cdev) &&
             ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) &&
-            (cdev != d->sibling)) {
-                cdev->private->state = DEV_STATE_NOT_OPER;
+            (cdev != d->sibling))
                 return 1;
-        }
         return 0;
 }
 
@@ -584,13 +617,36 @@ static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id,
         return dev ? to_ccwdev(dev) : NULL;
 }
 
-static void
-ccw_device_add_changed(void *data)
+static int match_orphan(struct device *dev, void *data)
+{
+        struct ccw_dev_id *dev_id;
+        struct ccw_device *cdev;
+
+        dev_id = data;
+        cdev = to_ccwdev(dev);
+        return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id);
+}
+
+static struct ccw_device *
+get_orphaned_ccwdev_by_dev_id(struct channel_subsystem *css,
+                              struct ccw_dev_id *dev_id)
 {
+        struct device *dev;
 
+        dev = device_find_child(&css->pseudo_subchannel->dev, dev_id,
+                                match_orphan);
+
+        return dev ? to_ccwdev(dev) : NULL;
+}
+
+static void
+ccw_device_add_changed(struct work_struct *work)
+{
+        struct ccw_device_private *priv;
         struct ccw_device *cdev;
 
-        cdev = data;
+        priv = container_of(work, struct ccw_device_private, kick_work);
+        cdev = priv->cdev;
         if (device_add(&cdev->dev)) {
                 put_device(&cdev->dev);
                 return;
@@ -602,64 +658,21 @@ ccw_device_add_changed(void *data)
         }
 }
 
-extern int css_get_ssd_info(struct subchannel *sch);
-
-void
-ccw_device_do_unreg_rereg(void *data)
+void ccw_device_do_unreg_rereg(struct work_struct *work)
 {
+        struct ccw_device_private *priv;
         struct ccw_device *cdev;
         struct subchannel *sch;
-        int need_rename;
 
-        cdev = data;
+        priv = container_of(work, struct ccw_device_private, kick_work);
+        cdev = priv->cdev;
         sch = to_subchannel(cdev->dev.parent);
-        if (cdev->private->dev_id.devno != sch->schib.pmcw.dev) {
-                /*
-                 * The device number has changed. This is usually only when
-                 * a device has been detached under VM and then re-appeared
-                 * on another subchannel because of a different attachment
-                 * order than before. Ideally, we should should just switch
-                 * subchannels, but unfortunately, this is not possible with
-                 * the current implementation.
-                 * Instead, we search for the old subchannel for this device
-                 * number and deregister so there are no collisions with the
-                 * newly registered ccw_device.
-                 * FIXME: Find another solution so the block layer doesn't
-                 *        get possibly sick...
-                 */
-                struct ccw_device *other_cdev;
-                struct ccw_dev_id dev_id;
-
-                need_rename = 1;
-                dev_id.devno = sch->schib.pmcw.dev;
-                dev_id.ssid = sch->schid.ssid;
-                other_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev);
-                if (other_cdev) {
-                        struct subchannel *other_sch;
-
-                        other_sch = to_subchannel(other_cdev->dev.parent);
-                        if (get_device(&other_sch->dev)) {
-                                stsch(other_sch->schid, &other_sch->schib);
-                                if (other_sch->schib.pmcw.dnv) {
-                                        other_sch->schib.pmcw.intparm = 0;
-                                        cio_modify(other_sch);
-                                }
-                                css_sch_device_unregister(other_sch);
-                        }
-                }
-                /* Update ssd info here. */
-                css_get_ssd_info(sch);
-                cdev->private->dev_id.devno = sch->schib.pmcw.dev;
-        } else
-                need_rename = 0;
+
         device_remove_files(&cdev->dev);
         if (test_and_clear_bit(1, &cdev->private->registered))
                 device_del(&cdev->dev);
-        if (need_rename)
-                snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x",
-                          sch->schid.ssid, sch->schib.pmcw.dev);
         PREPARE_WORK(&cdev->private->kick_work,
-                     ccw_device_add_changed, cdev);
+                     ccw_device_add_changed);
         queue_work(ccw_device_work, &cdev->private->kick_work);
 }
 
@@ -673,18 +686,194 @@ ccw_device_release(struct device *dev)
         kfree(cdev);
 }
 
+static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch)
+{
+        struct ccw_device *cdev;
+
+        cdev  = kzalloc(sizeof(*cdev), GFP_KERNEL);
+        if (cdev) {
+                cdev->private = kzalloc(sizeof(struct ccw_device_private),
+                                        GFP_KERNEL | GFP_DMA);
+                if (cdev->private)
+                        return cdev;
+        }
+        kfree(cdev);
+        return ERR_PTR(-ENOMEM);
+}
+
+static int io_subchannel_initialize_dev(struct subchannel *sch,
+                                        struct ccw_device *cdev)
+{
+        cdev->private->cdev = cdev;
+        atomic_set(&cdev->private->onoff, 0);
+        cdev->dev.parent = &sch->dev;
+        cdev->dev.release = ccw_device_release;
+        INIT_LIST_HEAD(&cdev->private->kick_work.entry);
+        /* Do first half of device_register. */
+        device_initialize(&cdev->dev);
+        if (!get_device(&sch->dev)) {
+                if (cdev->dev.release)
+                        cdev->dev.release(&cdev->dev);
+                return -ENODEV;
+        }
+        return 0;
+}
+
+static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch)
+{
+        struct ccw_device *cdev;
+        int ret;
+
+        cdev = io_subchannel_allocate_dev(sch);
+        if (!IS_ERR(cdev)) {
+                ret = io_subchannel_initialize_dev(sch, cdev);
+                if (ret) {
+                        kfree(cdev);
+                        cdev = ERR_PTR(ret);
+                }
+        }
+        return cdev;
+}
+
+static int io_subchannel_recog(struct ccw_device *, struct subchannel *);
+
+static void sch_attach_device(struct subchannel *sch,
+                              struct ccw_device *cdev)
+{
+        spin_lock_irq(sch->lock);
+        sch->dev.driver_data = cdev;
+        cdev->private->schid = sch->schid;
+        cdev->ccwlock = sch->lock;
+        device_trigger_reprobe(sch);
+        spin_unlock_irq(sch->lock);
+}
+
+static void sch_attach_disconnected_device(struct subchannel *sch,
+                                           struct ccw_device *cdev)
+{
+        struct subchannel *other_sch;
+        int ret;
+
+        other_sch = to_subchannel(get_device(cdev->dev.parent));
+        ret = device_move(&cdev->dev, &sch->dev);
+        if (ret) {
+                CIO_MSG_EVENT(2, "Moving disconnected device 0.%x.%04x failed "
+                              "(ret=%d)!\n", cdev->private->dev_id.ssid,
+                              cdev->private->dev_id.devno, ret);
+                put_device(&other_sch->dev);
+                return;
+        }
+        other_sch->dev.driver_data = NULL;
+        /* No need to keep a subchannel without ccw device around. */
+        css_sch_device_unregister(other_sch);
+        put_device(&other_sch->dev);
+        sch_attach_device(sch, cdev);
+}
+
+static void sch_attach_orphaned_device(struct subchannel *sch,
+                                       struct ccw_device *cdev)
+{
+        int ret;
+
+        /* Try to move the ccw device to its new subchannel. */
+        ret = device_move(&cdev->dev, &sch->dev);
+        if (ret) {
+                CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage "
+                              "failed (ret=%d)!\n",
+                              cdev->private->dev_id.ssid,
+                              cdev->private->dev_id.devno, ret);
+                return;
+        }
+        sch_attach_device(sch, cdev);
+}
+
+static void sch_create_and_recog_new_device(struct subchannel *sch)
+{
+        struct ccw_device *cdev;
+
+        /* Need to allocate a new ccw device. */
+        cdev = io_subchannel_create_ccwdev(sch);
+        if (IS_ERR(cdev)) {
+                /* OK, we did everything we could... */
+                css_sch_device_unregister(sch);
+                return;
+        }
+        spin_lock_irq(sch->lock);
+        sch->dev.driver_data = cdev;
+        spin_unlock_irq(sch->lock);
+        /* Start recognition for the new ccw device. */
+        if (io_subchannel_recog(cdev, sch)) {
+                spin_lock_irq(sch->lock);
+                sch->dev.driver_data = NULL;
+                spin_unlock_irq(sch->lock);
+                if (cdev->dev.release)
+                        cdev->dev.release(&cdev->dev);
+                css_sch_device_unregister(sch);
+        }
+}
+
+
+void ccw_device_move_to_orphanage(struct work_struct *work)
+{
+        struct ccw_device_private *priv;
+        struct ccw_device *cdev;
+        struct ccw_device *replacing_cdev;
+        struct subchannel *sch;
+        int ret;
+        struct channel_subsystem *css;
+        struct ccw_dev_id dev_id;
+
+        priv = container_of(work, struct ccw_device_private, kick_work);
+        cdev = priv->cdev;
+        sch = to_subchannel(cdev->dev.parent);
+        css = to_css(sch->dev.parent);
+        dev_id.devno = sch->schib.pmcw.dev;
+        dev_id.ssid = sch->schid.ssid;
+
+        /*
+         * Move the orphaned ccw device to the orphanage so the replacing
+         * ccw device can take its place on the subchannel.
+         */
+        ret = device_move(&cdev->dev, &css->pseudo_subchannel->dev);
+        if (ret) {
+                CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed "
+                              "(ret=%d)!\n", cdev->private->dev_id.ssid,
+                              cdev->private->dev_id.devno, ret);
+                return;
+        }
+        cdev->ccwlock = css->pseudo_subchannel->lock;
+        /*
+         * Search for the replacing ccw device
+         * - among the disconnected devices
+         * - in the orphanage
+         */
+        replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev);
+        if (replacing_cdev) {
+                sch_attach_disconnected_device(sch, replacing_cdev);
+                return;
+        }
+        replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id);
+        if (replacing_cdev) {
+                sch_attach_orphaned_device(sch, replacing_cdev);
+                return;
+        }
+        sch_create_and_recog_new_device(sch);
+}
+
 /*
  * Register recognized device.
  */
 static void
-io_subchannel_register(void *data)
+io_subchannel_register(struct work_struct *work)
 {
+        struct ccw_device_private *priv;
         struct ccw_device *cdev;
         struct subchannel *sch;
         int ret;
         unsigned long flags;
 
-        cdev = data;
+        priv = container_of(work, struct ccw_device_private, kick_work);
+        cdev = priv->cdev;
         sch = to_subchannel(cdev->dev.parent);
 
         /*
@@ -709,9 +898,9 @@ io_subchannel_register(void *data)
                 printk (KERN_WARNING "%s: could not register %s\n",
                         __func__, cdev->dev.bus_id);
                 put_device(&cdev->dev);
-                spin_lock_irqsave(&sch->lock, flags);
+                spin_lock_irqsave(sch->lock, flags);
                 sch->dev.driver_data = NULL;
-                spin_unlock_irqrestore(&sch->lock, flags);
+                spin_unlock_irqrestore(sch->lock, flags);
                 kfree (cdev->private);
                 kfree (cdev);
                 put_device(&sch->dev);
@@ -719,11 +908,6 @@ io_subchannel_register(void *data)
                         wake_up(&ccw_device_init_wq);
                 return;
         }
-
-        ret = subchannel_add_files(cdev->dev.parent);
-        if (ret)
-                printk(KERN_WARNING "%s: could not add attributes to %s\n",
-                       __func__, sch->dev.bus_id);
         put_device(&cdev->dev);
 out:
         cdev->private->flags.recog_done = 1;
@@ -734,11 +918,14 @@ out:
 }
 
 void
-ccw_device_call_sch_unregister(void *data)
+ccw_device_call_sch_unregister(struct work_struct *work)
 {
-        struct ccw_device *cdev = data;
+        struct ccw_device_private *priv;
+        struct ccw_device *cdev;
         struct subchannel *sch;
 
+        priv = container_of(work, struct ccw_device_private, kick_work);
+        cdev = priv->cdev;
         sch = to_subchannel(cdev->dev.parent);
         css_sch_device_unregister(sch);
         /* Reset intparm to zeroes. */
@@ -768,7 +955,7 @@ io_subchannel_recog_done(struct ccw_device *cdev)
                         break;
                 sch = to_subchannel(cdev->dev.parent);
                 PREPARE_WORK(&cdev->private->kick_work,
-                             ccw_device_call_sch_unregister, cdev);
+                             ccw_device_call_sch_unregister);
                 queue_work(slow_path_wq, &cdev->private->kick_work);
                 if (atomic_dec_and_test(&ccw_device_init_count))
                         wake_up(&ccw_device_init_wq);
@@ -783,7 +970,7 @@ io_subchannel_recog_done(struct ccw_device *cdev)
                 if (!get_device(&cdev->dev))
                         break;
                 PREPARE_WORK(&cdev->private->kick_work,
-                             io_subchannel_register, cdev);
+                             io_subchannel_register);
                 queue_work(slow_path_wq, &cdev->private->kick_work);
                 break;
         }
@@ -797,7 +984,7 @@ io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
 
         sch->dev.driver_data = cdev;
         sch->driver = &io_subchannel_driver;
-        cdev->ccwlock = &sch->lock;
+        cdev->ccwlock = sch->lock;
 
         /* Init private data. */
         priv = cdev->private;
@@ -817,9 +1004,9 @@ io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
         atomic_inc(&ccw_device_init_count);
 
         /* Start async. device sensing. */
-        spin_lock_irq(&sch->lock);
+        spin_lock_irq(sch->lock);
         rc = ccw_device_recognition(cdev);
-        spin_unlock_irq(&sch->lock);
+        spin_unlock_irq(sch->lock);
         if (rc) {
                 if (atomic_dec_and_test(&ccw_device_init_count))
                         wake_up(&ccw_device_init_wq);
@@ -827,12 +1014,55 @@ io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
         return rc;
 }
 
+static void ccw_device_move_to_sch(struct work_struct *work)
+{
+        struct ccw_device_private *priv;
+        int rc;
+        struct subchannel *sch;
+        struct ccw_device *cdev;
+        struct subchannel *former_parent;
+
+        priv = container_of(work, struct ccw_device_private, kick_work);
+        sch = priv->sch;
+        cdev = priv->cdev;
+        former_parent = ccw_device_is_orphan(cdev) ?
+                NULL : to_subchannel(get_device(cdev->dev.parent));
+        mutex_lock(&sch->reg_mutex);
+        /* Try to move the ccw device to its new subchannel. */
+        rc = device_move(&cdev->dev, &sch->dev);
+        mutex_unlock(&sch->reg_mutex);
+        if (rc) {
+                CIO_MSG_EVENT(2, "Moving device 0.%x.%04x to subchannel "
+                              "0.%x.%04x failed (ret=%d)!\n",
+                              cdev->private->dev_id.ssid,
+                              cdev->private->dev_id.devno, sch->schid.ssid,
+                              sch->schid.sch_no, rc);
+                css_sch_device_unregister(sch);
+                goto out;
+        }
+        if (former_parent) {
+                spin_lock_irq(former_parent->lock);
+                former_parent->dev.driver_data = NULL;
+                spin_unlock_irq(former_parent->lock);
+                css_sch_device_unregister(former_parent);
+                /* Reset intparm to zeroes. */
+                former_parent->schib.pmcw.intparm = 0;
+                cio_modify(former_parent);
+        }
+        sch_attach_device(sch, cdev);
+out:
+        if (former_parent)
+                put_device(&former_parent->dev);
+        put_device(&cdev->dev);
+}
+
 static int
 io_subchannel_probe (struct subchannel *sch)
 {
         struct ccw_device *cdev;
         int rc;
         unsigned long flags;
+        struct ccw_dev_id dev_id;
 
         if (sch->dev.driver_data) {
                 /*
@@ -843,7 +1073,6 @@ io_subchannel_probe (struct subchannel *sch)
                 cdev = sch->dev.driver_data;
                 device_initialize(&cdev->dev);
                 ccw_device_register(cdev);
-                subchannel_add_files(&sch->dev);
                 /*
                  * Check if the device is already online. If it is
                  * the reference count needs to be corrected
@@ -856,33 +1085,37 @@ io_subchannel_probe (struct subchannel *sch)
                         get_device(&cdev->dev);
                 return 0;
         }
-        cdev = kzalloc (sizeof(*cdev), GFP_KERNEL);
+        /*
+         * First check if a fitting device may be found amongst the
+         * disconnected devices or in the orphanage.
+         */
+        dev_id.devno = sch->schib.pmcw.dev;
+        dev_id.ssid = sch->schid.ssid;
+        cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL);
         if (!cdev)
-                return -ENOMEM;
-        cdev->private = kzalloc(sizeof(struct ccw_device_private),
-                                GFP_KERNEL | GFP_DMA);
-        if (!cdev->private) {
-                kfree(cdev);
-                return -ENOMEM;
-        }
-        atomic_set(&cdev->private->onoff, 0);
-        cdev->dev.parent = &sch->dev;
-        cdev->dev.release = ccw_device_release;
-        INIT_LIST_HEAD(&cdev->private->kick_work.entry);
-        /* Do first half of device_register. */
-        device_initialize(&cdev->dev);
-
-        if (!get_device(&sch->dev)) {
-                if (cdev->dev.release)
-                        cdev->dev.release(&cdev->dev);
-                return -ENODEV;
+                cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent),
+                                                     &dev_id);
+        if (cdev) {
+                /*
+                 * Schedule moving the device until when we have a registered
+                 * subchannel to move to and succeed the probe. We can
+                 * unregister later again, when the probe is through.
+                 */
+                cdev->private->sch = sch;
+                PREPARE_WORK(&cdev->private->kick_work,
+                             ccw_device_move_to_sch);
+                queue_work(slow_path_wq, &cdev->private->kick_work);
+                return 0;
         }
+        cdev = io_subchannel_create_ccwdev(sch);
+        if (IS_ERR(cdev))
+                return PTR_ERR(cdev);
 
         rc = io_subchannel_recog(cdev, sch);
         if (rc) {
-                spin_lock_irqsave(&sch->lock, flags);
+                spin_lock_irqsave(sch->lock, flags);
                 sch->dev.driver_data = NULL;
-                spin_unlock_irqrestore(&sch->lock, flags);
+                spin_unlock_irqrestore(sch->lock, flags);
                 if (cdev->dev.release)
                         cdev->dev.release(&cdev->dev);
         }
@@ -890,17 +1123,6 @@ io_subchannel_probe (struct subchannel *sch)
         return rc;
 }
 
-static void
-ccw_device_unregister(void *data)
-{
-        struct ccw_device *cdev;
-
-        cdev = (struct ccw_device *)data;
-        if (test_and_clear_bit(1, &cdev->private->registered))
-                device_unregister(&cdev->dev);
-        put_device(&cdev->dev);
-}
-
 static int
 io_subchannel_remove (struct subchannel *sch)
 {
@@ -921,7 +1143,7 @@ io_subchannel_remove (struct subchannel *sch)
          */
         if (get_device(&cdev->dev)) {
                 PREPARE_WORK(&cdev->private->kick_work,
-                             ccw_device_unregister, cdev);
+                             ccw_device_unregister);
                 queue_work(ccw_device_work, &cdev->private->kick_work);
         }
         return 0;
@@ -1003,6 +1225,13 @@ static struct ccw_device console_cdev;
 static struct ccw_device_private console_private;
 static int console_cdev_in_use;
 
+static DEFINE_SPINLOCK(ccw_console_lock);
+
+spinlock_t * cio_get_console_lock(void)
+{
+        return &ccw_console_lock;
+}
+
 static int
 ccw_device_console_enable (struct ccw_device *cdev, struct subchannel *sch)
 {
@@ -1048,6 +1277,7 @@ ccw_device_probe_console(void)
         memset(&console_cdev, 0, sizeof(struct ccw_device));
         memset(&console_private, 0, sizeof(struct ccw_device_private));
         console_cdev.private = &console_private;
+        console_private.cdev = &console_cdev;
         ret = ccw_device_console_enable(&console_cdev, sch);
         if (ret) {
                 cio_release_console();
diff --git a/drivers/s390/cio/device.h b/drivers/s390/cio/device.h
index 9233b5c0bcc..29db6341d63 100644
--- a/drivers/s390/cio/device.h
+++ b/drivers/s390/cio/device.h
@@ -78,8 +78,10 @@ void io_subchannel_recog_done(struct ccw_device *cdev);
 
 int ccw_device_cancel_halt_clear(struct ccw_device *);
 
-void ccw_device_do_unreg_rereg(void *);
-void ccw_device_call_sch_unregister(void *);
+void ccw_device_do_unreg_rereg(struct work_struct *);
+void ccw_device_call_sch_unregister(struct work_struct *);
+void ccw_device_move_to_orphanage(struct work_struct *);
+int ccw_device_is_orphan(struct ccw_device *);
 
 int ccw_device_recognition(struct ccw_device *);
 int ccw_device_online(struct ccw_device *);
diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c
index 09c7672eb3f..eed14572fc3 100644
--- a/drivers/s390/cio/device_fsm.c
+++ b/drivers/s390/cio/device_fsm.c
@@ -186,15 +186,14 @@ ccw_device_handle_oper(struct ccw_device *cdev)
         /*
          * Check if cu type and device type still match. If
          * not, it is certainly another device and we have to
-         * de- and re-register. Also check here for non-matching devno.
+         * de- and re-register.
          */
         if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
             cdev->id.cu_model != cdev->private->senseid.cu_model ||
             cdev->id.dev_type != cdev->private->senseid.dev_type ||
-            cdev->id.dev_model != cdev->private->senseid.dev_model ||
-            cdev->private->dev_id.devno != sch->schib.pmcw.dev) {
+            cdev->id.dev_model != cdev->private->senseid.dev_model) {
                 PREPARE_WORK(&cdev->private->kick_work,
-                             ccw_device_do_unreg_rereg, cdev);
+                             ccw_device_do_unreg_rereg);
                 queue_work(ccw_device_work, &cdev->private->kick_work);
                 return 0;
         }
@@ -329,19 +328,21 @@ ccw_device_sense_id_done(struct ccw_device *cdev, int err)
 }
 
 static void
-ccw_device_oper_notify(void *data)
+ccw_device_oper_notify(struct work_struct *work)
 {
+        struct ccw_device_private *priv;
         struct ccw_device *cdev;
         struct subchannel *sch;
         int ret;
 
-        cdev = data;
+        priv = container_of(work, struct ccw_device_private, kick_work);
+        cdev = priv->cdev;
         sch = to_subchannel(cdev->dev.parent);
         ret = (sch->driver && sch->driver->notify) ?
                 sch->driver->notify(&sch->dev, CIO_OPER) : 0;
         if (!ret)
                 /* Driver doesn't want device back. */
-                ccw_device_do_unreg_rereg(cdev);
+                ccw_device_do_unreg_rereg(work);
         else {
                 /* Reenable channel measurements, if needed. */
                 cmf_reenable(cdev);
@@ -377,8 +378,7 @@ ccw_device_done(struct ccw_device *cdev, int state)
 
         if (cdev->private->flags.donotify) {
                 cdev->private->flags.donotify = 0;
-                PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify,
-                             cdev);
+                PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify);
                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
         }
         wake_up(&cdev->private->wait_q);
@@ -528,13 +528,15 @@ ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 
 
 static void
-ccw_device_nopath_notify(void *data)
+ccw_device_nopath_notify(struct work_struct *work)
 {
+        struct ccw_device_private *priv;
         struct ccw_device *cdev;
         struct subchannel *sch;
         int ret;
 
-        cdev = data;
+        priv = container_of(work, struct ccw_device_private, kick_work);
+        cdev = priv->cdev;
         sch = to_subchannel(cdev->dev.parent);
         /* Extra sanity. */
         if (sch->lpm)
@@ -547,8 +549,7 @@ ccw_device_nopath_notify(void *data)
                         cio_disable_subchannel(sch);
                         if (get_device(&cdev->dev)) {
                                 PREPARE_WORK(&cdev->private->kick_work,
-                                             ccw_device_call_sch_unregister,
-                                             cdev);
+                                             ccw_device_call_sch_unregister);
                                 queue_work(ccw_device_work,
                                            &cdev->private->kick_work);
                         } else
@@ -607,7 +608,7 @@ ccw_device_verify_done(struct ccw_device *cdev, int err)
                 /* Reset oper notify indication after verify error. */
                 cdev->private->flags.donotify = 0;
                 PREPARE_WORK(&cdev->private->kick_work,
-                             ccw_device_nopath_notify, cdev);
+                             ccw_device_nopath_notify);
                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
                 break;
@@ -674,6 +675,10 @@ ccw_device_offline(struct ccw_device *cdev)
 {
         struct subchannel *sch;
 
+        if (ccw_device_is_orphan(cdev)) {
+                ccw_device_done(cdev, DEV_STATE_OFFLINE);
+                return 0;
+        }
         sch = to_subchannel(cdev->dev.parent);
         if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
                 return -ENODEV;
@@ -738,7 +743,7 @@ ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
         sch = to_subchannel(cdev->dev.parent);
         if (get_device(&cdev->dev)) {
                 PREPARE_WORK(&cdev->private->kick_work,
-                             ccw_device_call_sch_unregister, cdev);
+                             ccw_device_call_sch_unregister);
                 queue_work(ccw_device_work, &cdev->private->kick_work);
         }
         wake_up(&cdev->private->wait_q);
@@ -769,7 +774,7 @@ ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
         }
         if (get_device(&cdev->dev)) {
                 PREPARE_WORK(&cdev->private->kick_work,
-                             ccw_device_call_sch_unregister, cdev);
+                             ccw_device_call_sch_unregister);
                 queue_work(ccw_device_work, &cdev->private->kick_work);
         }
         wake_up(&cdev->private->wait_q);
@@ -874,7 +879,7 @@ ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
                 sch = to_subchannel(cdev->dev.parent);
                 if (!sch->lpm) {
                         PREPARE_WORK(&cdev->private->kick_work,
-                                     ccw_device_nopath_notify, cdev);
+                                     ccw_device_nopath_notify);
                         queue_work(ccw_device_notify_work,
                                    &cdev->private->kick_work);
                 } else
@@ -969,7 +974,7 @@ ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
                               ERR_PTR(-EIO));
         if (!sch->lpm) {
                 PREPARE_WORK(&cdev->private->kick_work,
-                             ccw_device_nopath_notify, cdev);
+                             ccw_device_nopath_notify);
                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
         } else if (cdev->private->flags.doverify)
                 /* Start delayed path verification. */
@@ -992,7 +997,7 @@ ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
                 sch = to_subchannel(cdev->dev.parent);
                 if (!sch->lpm) {
                         PREPARE_WORK(&cdev->private->kick_work,
-                                     ccw_device_nopath_notify, cdev);
+                                     ccw_device_nopath_notify);
                         queue_work(ccw_device_notify_work,
                                    &cdev->private->kick_work);
                 } else
@@ -1021,7 +1026,7 @@ void device_kill_io(struct subchannel *sch)
         if (ret == -ENODEV) {
                 if (!sch->lpm) {
                         PREPARE_WORK(&cdev->private->kick_work,
-                                     ccw_device_nopath_notify, cdev);
+                                     ccw_device_nopath_notify);
                         queue_work(ccw_device_notify_work,
                                    &cdev->private->kick_work);
                 } else
@@ -1033,7 +1038,7 @@ void device_kill_io(struct subchannel *sch)
                               ERR_PTR(-EIO));
         if (!sch->lpm) {
                 PREPARE_WORK(&cdev->private->kick_work,
-                             ccw_device_nopath_notify, cdev);
+                             ccw_device_nopath_notify);
                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
         } else
                 /* Start delayed path verification. */
@@ -1104,7 +1109,8 @@ device_trigger_reprobe(struct subchannel *sch)
         /* Update some values. */
         if (stsch(sch->schid, &sch->schib))
                 return;
-
+        if (!sch->schib.pmcw.dnv)
+                return;
         /*
          * The pim, pam, pom values may not be accurate, but they are the best
          * we have before performing device selection :/
@@ -1118,7 +1124,13 @@ device_trigger_reprobe(struct subchannel *sch)
                 sch->schib.pmcw.mp = 1;
         sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
         /* We should also udate ssd info, but this has to wait. */
-        ccw_device_start_id(cdev, 0);
+        /* Check if this is another device which appeared on the same sch. */
+        if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
+                PREPARE_WORK(&cdev->private->kick_work,
+                             ccw_device_move_to_orphanage);
+                queue_work(ccw_device_work, &cdev->private->kick_work);
+        } else
+                ccw_device_start_id(cdev, 0);
 }
 
 static void
diff --git a/drivers/s390/cio/device_ops.c b/drivers/s390/cio/device_ops.c
index b39c1fa48ac..d269607336e 100644
--- a/drivers/s390/cio/device_ops.c
+++ b/drivers/s390/cio/device_ops.c
@@ -316,9 +316,9 @@ __ccw_device_retry_loop(struct ccw_device *cdev, struct ccw1 *ccw, long magic, _
                         ccw_device_set_timeout(cdev, 0);
                 if (ret == -EBUSY) {
                         /* Try again later. */
-                        spin_unlock_irq(&sch->lock);
+                        spin_unlock_irq(sch->lock);
                         msleep(10);
-                        spin_lock_irq(&sch->lock);
+                        spin_lock_irq(sch->lock);
                         continue;
                 }
                 if (ret != 0)
@@ -326,12 +326,12 @@ __ccw_device_retry_loop(struct ccw_device *cdev, struct ccw1 *ccw, long magic, _
                         break;
                 /* Wait for end of request. */
                 cdev->private->intparm = magic;
-                spin_unlock_irq(&sch->lock);
+                spin_unlock_irq(sch->lock);
                 wait_event(cdev->private->wait_q,
                            (cdev->private->intparm == -EIO) ||
                            (cdev->private->intparm == -EAGAIN) ||
                            (cdev->private->intparm == 0));
-                spin_lock_irq(&sch->lock);
+                spin_lock_irq(sch->lock);
                 /* Check at least for channel end / device end */
                 if (cdev->private->intparm == -EIO) {
                         /* Non-retryable error. */
@@ -342,9 +342,9 @@ __ccw_device_retry_loop(struct ccw_device *cdev, struct ccw1 *ccw, long magic, _
                         /* Success. */
                         break;
                 /* Try again later. */
-                spin_unlock_irq(&sch->lock);
+                spin_unlock_irq(sch->lock);
                 msleep(10);
-                spin_lock_irq(&sch->lock);
+                spin_lock_irq(sch->lock);
         } while (1);
 
         return ret;
@@ -389,7 +389,7 @@ read_dev_chars (struct ccw_device *cdev, void **buffer, int length)
                 return ret;
         }
 
-        spin_lock_irq(&sch->lock);
+        spin_lock_irq(sch->lock);
         /* Save interrupt handler. */
         handler = cdev->handler;
         /* Temporarily install own handler. */
@@ -406,7 +406,7 @@ read_dev_chars (struct ccw_device *cdev, void **buffer, int length)
 
         /* Restore interrupt handler. */
         cdev->handler = handler;
-        spin_unlock_irq(&sch->lock);
+        spin_unlock_irq(sch->lock);
 
         clear_normalized_cda (rdc_ccw);
         kfree(rdc_ccw);
@@ -463,7 +463,7 @@ read_conf_data_lpm (struct ccw_device *cdev, void **buffer, int *length, __u8 lp
         rcd_ccw->count = ciw->count;
         rcd_ccw->flags = CCW_FLAG_SLI;
 
-        spin_lock_irq(&sch->lock);
+        spin_lock_irq(sch->lock);
         /* Save interrupt handler. */
         handler = cdev->handler;
         /* Temporarily install own handler. */
@@ -480,7 +480,7 @@ read_conf_data_lpm (struct ccw_device *cdev, void **buffer, int *length, __u8 lp
 
         /* Restore interrupt handler. */
         cdev->handler = handler;
-        spin_unlock_irq(&sch->lock);
+        spin_unlock_irq(sch->lock);
 
         /*
          * on success we update the user input parms
@@ -537,7 +537,7 @@ ccw_device_stlck(struct ccw_device *cdev)
                 kfree(buf);
                 return -ENOMEM;
         }
-        spin_lock_irqsave(&sch->lock, flags);
+        spin_lock_irqsave(sch->lock, flags);
         ret = cio_enable_subchannel(sch, 3);
         if (ret)
                 goto out_unlock;
@@ -559,9 +559,9 @@ ccw_device_stlck(struct ccw_device *cdev)
                 goto out_unlock;
         }
         cdev->private->irb.scsw.actl |= SCSW_ACTL_START_PEND;
-        spin_unlock_irqrestore(&sch->lock, flags);
+        spin_unlock_irqrestore(sch->lock, flags);
         wait_event(cdev->private->wait_q, cdev->private->irb.scsw.actl == 0);
-        spin_lock_irqsave(&sch->lock, flags);
+        spin_lock_irqsave(sch->lock, flags);
         cio_disable_subchannel(sch); //FIXME: return code?
         if ((cdev->private->irb.scsw.dstat !=
              (DEV_STAT_CHN_END|DEV_STAT_DEV_END)) ||
@@ -572,7 +572,7 @@ ccw_device_stlck(struct ccw_device *cdev)
 out_unlock:
         kfree(buf);
         kfree(buf2);
-        spin_unlock_irqrestore(&sch->lock, flags);
+        spin_unlock_irqrestore(sch->lock, flags);
         return ret;
 }
 
diff --git a/drivers/s390/cio/qdio.c b/drivers/s390/cio/qdio.c
index 8d5fa1b4d11..9d4ea449a60 100644
--- a/drivers/s390/cio/qdio.c
+++ b/drivers/s390/cio/qdio.c
@@ -46,6 +46,7 @@
 #include <asm/timex.h>
 
 #include <asm/debug.h>
+#include <asm/s390_rdev.h>
 #include <asm/qdio.h>
 
 #include "cio.h"
@@ -65,12 +66,12 @@ MODULE_LICENSE("GPL");
 /******************** HERE WE GO ***********************************/
 
 static const char version[] = "QDIO base support version 2";
+extern struct bus_type ccw_bus_type;
 
-#ifdef QDIO_PERFORMANCE_STATS
+static int qdio_performance_stats = 0;
 static int proc_perf_file_registration;
 static unsigned long i_p_c, i_p_nc, o_p_c, o_p_nc, ii_p_c, ii_p_nc;
 static struct qdio_perf_stats perf_stats;
-#endif /* QDIO_PERFORMANCE_STATS */
 
 static int hydra_thinints;
 static int is_passthrough = 0;
@@ -275,9 +276,8 @@ qdio_siga_sync(struct qdio_q *q, unsigned int gpr2,
         QDIO_DBF_TEXT4(0,trace,"sigasync");
         QDIO_DBF_HEX4(0,trace,&q,sizeof(void*));
 
-#ifdef QDIO_PERFORMANCE_STATS
-        perf_stats.siga_syncs++;
-#endif /* QDIO_PERFORMANCE_STATS */
+        if (qdio_performance_stats)
+                perf_stats.siga_syncs++;
 
         cc = do_siga_sync(q->schid, gpr2, gpr3);
         if (cc)
@@ -322,9 +322,8 @@ qdio_siga_output(struct qdio_q *q)
         __u32 busy_bit;
         __u64 start_time=0;
 
-#ifdef QDIO_PERFORMANCE_STATS
-        perf_stats.siga_outs++;
-#endif /* QDIO_PERFORMANCE_STATS */
+        if (qdio_performance_stats)
+                perf_stats.siga_outs++;
 
         QDIO_DBF_TEXT4(0,trace,"sigaout");
         QDIO_DBF_HEX4(0,trace,&q,sizeof(void*));
@@ -358,9 +357,8 @@ qdio_siga_input(struct qdio_q *q)
         QDIO_DBF_TEXT4(0,trace,"sigain");
         QDIO_DBF_HEX4(0,trace,&q,sizeof(void*));
 
-#ifdef QDIO_PERFORMANCE_STATS
-        perf_stats.siga_ins++;
-#endif /* QDIO_PERFORMANCE_STATS */
+        if (qdio_performance_stats)
+                perf_stats.siga_ins++;
 
         cc = do_siga_input(q->schid, q->mask);
         
@@ -954,9 +952,8 @@ __qdio_outbound_processing(struct qdio_q *q)
 
         if (unlikely(qdio_reserve_q(q))) {
                 qdio_release_q(q);
-#ifdef QDIO_PERFORMANCE_STATS
-                o_p_c++;
-#endif /* QDIO_PERFORMANCE_STATS */
+                if (qdio_performance_stats)
+                        o_p_c++;
                 /* as we're sissies, we'll check next time */
                 if (likely(!atomic_read(&q->is_in_shutdown))) {
                         qdio_mark_q(q);
@@ -964,10 +961,10 @@ __qdio_outbound_processing(struct qdio_q *q)
                 }
                 return;
         }
-#ifdef QDIO_PERFORMANCE_STATS
-        o_p_nc++;
-        perf_stats.tl_runs++;
-#endif /* QDIO_PERFORMANCE_STATS */
+        if (qdio_performance_stats) {
+                o_p_nc++;
+                perf_stats.tl_runs++;
+        }
 
         /* see comment in qdio_kick_outbound_q */
         siga_attempts=atomic_read(&q->busy_siga_counter);
@@ -1142,15 +1139,16 @@ qdio_has_inbound_q_moved(struct qdio_q *q)
 {
         int i;
 
-#ifdef QDIO_PERFORMANCE_STATS
         static int old_pcis=0;
         static int old_thinints=0;
 
-        if ((old_pcis==perf_stats.pcis)&&(old_thinints==perf_stats.thinints))
-                perf_stats.start_time_inbound=NOW;
-        else
-                old_pcis=perf_stats.pcis;
-#endif /* QDIO_PERFORMANCE_STATS */
+        if (qdio_performance_stats) {
+                if ((old_pcis==perf_stats.pcis)&&
+                    (old_thinints==perf_stats.thinints))
+                        perf_stats.start_time_inbound=NOW;
+                else
+                        old_pcis=perf_stats.pcis;
+        }
 
         i=qdio_get_inbound_buffer_frontier(q);
         if ( (i!=GET_SAVED_FRONTIER(q)) ||
@@ -1340,10 +1338,10 @@ qdio_kick_inbound_handler(struct qdio_q *q)
         q->siga_error=0;
         q->error_status_flags=0;
 
-#ifdef QDIO_PERFORMANCE_STATS
-        perf_stats.inbound_time+=NOW-perf_stats.start_time_inbound;
-        perf_stats.inbound_cnt++;
-#endif /* QDIO_PERFORMANCE_STATS */
+        if (qdio_performance_stats) {
+                perf_stats.inbound_time+=NOW-perf_stats.start_time_inbound;
+                perf_stats.inbound_cnt++;
+        }
 }
 
 static inline void
@@ -1363,9 +1361,8 @@ __tiqdio_inbound_processing(struct qdio_q *q, int spare_ind_was_set)
          */
         if (unlikely(qdio_reserve_q(q))) {
                 qdio_release_q(q);
-#ifdef QDIO_PERFORMANCE_STATS
-                ii_p_c++;
-#endif /* QDIO_PERFORMANCE_STATS */
+                if (qdio_performance_stats)
+                        ii_p_c++;
                 /* 
                  * as we might just be about to stop polling, we make
                  * sure that we check again at least once more 
@@ -1373,9 +1370,8 @@ __tiqdio_inbound_processing(struct qdio_q *q, int spare_ind_was_set)
                 tiqdio_sched_tl();
                 return;
         }
-#ifdef QDIO_PERFORMANCE_STATS
-        ii_p_nc++;
-#endif /* QDIO_PERFORMANCE_STATS */
+        if (qdio_performance_stats)
+                ii_p_nc++;
         if (unlikely(atomic_read(&q->is_in_shutdown))) {
                 qdio_unmark_q(q);
                 goto out;
@@ -1416,11 +1412,11 @@ __tiqdio_inbound_processing(struct qdio_q *q, int spare_ind_was_set)
                 irq_ptr = (struct qdio_irq*)q->irq_ptr;
                 for (i=0;i<irq_ptr->no_output_qs;i++) {
                         oq = irq_ptr->output_qs[i];
-#ifdef QDIO_PERFORMANCE_STATS
-                        perf_stats.tl_runs--;
-#endif /* QDIO_PERFORMANCE_STATS */
-                        if (!qdio_is_outbound_q_done(oq))
+                        if (!qdio_is_outbound_q_done(oq)) {
+                                if (qdio_performance_stats)
+                                        perf_stats.tl_runs--;
                                 __qdio_outbound_processing(oq);
+                        }
                 }
         }
 
@@ -1457,9 +1453,8 @@ __qdio_inbound_processing(struct qdio_q *q)
 
         if (unlikely(qdio_reserve_q(q))) {
                 qdio_release_q(q);
-#ifdef QDIO_PERFORMANCE_STATS
-                i_p_c++;
-#endif /* QDIO_PERFORMANCE_STATS */
+                if (qdio_performance_stats)
+                        i_p_c++;
                 /* as we're sissies, we'll check next time */
                 if (likely(!atomic_read(&q->is_in_shutdown))) {
                         qdio_mark_q(q);
@@ -1467,10 +1462,10 @@ __qdio_inbound_processing(struct qdio_q *q)
                 }
                 return;
         }
-#ifdef QDIO_PERFORMANCE_STATS
-        i_p_nc++;
-        perf_stats.tl_runs++;
-#endif /* QDIO_PERFORMANCE_STATS */
+        if (qdio_performance_stats) {
+                i_p_nc++;
+                perf_stats.tl_runs++;
+        }
 
 again:
         if (qdio_has_inbound_q_moved(q)) {
@@ -1516,9 +1511,8 @@ tiqdio_reset_processing_state(struct qdio_q *q, int q_laps)
 
         if (unlikely(qdio_reserve_q(q))) {
                 qdio_release_q(q);
-#ifdef QDIO_PERFORMANCE_STATS
-                ii_p_c++;
-#endif /* QDIO_PERFORMANCE_STATS */
+                if (qdio_performance_stats)
+                        ii_p_c++;
                 /* 
                  * as we might just be about to stop polling, we make
                  * sure that we check again at least once more 
@@ -1609,9 +1603,8 @@ tiqdio_tl(unsigned long data)
 {
         QDIO_DBF_TEXT4(0,trace,"iqdio_tl");
 
-#ifdef QDIO_PERFORMANCE_STATS
-        perf_stats.tl_runs++;
-#endif /* QDIO_PERFORMANCE_STATS */
+        if (qdio_performance_stats)
+                perf_stats.tl_runs++;
 
         tiqdio_inbound_checks();
 }
@@ -1918,10 +1911,10 @@ tiqdio_thinint_handler(void)
 {
         QDIO_DBF_TEXT4(0,trace,"thin_int");
 
-#ifdef QDIO_PERFORMANCE_STATS
-        perf_stats.thinints++;
-        perf_stats.start_time_inbound=NOW;
-#endif /* QDIO_PERFORMANCE_STATS */
+        if (qdio_performance_stats) {
+                perf_stats.thinints++;
+                perf_stats.start_time_inbound=NOW;
+        }
 
         /* SVS only when needed:
          * issue SVS to benefit from iqdio interrupt avoidance
@@ -1976,18 +1969,17 @@ qdio_handle_pci(struct qdio_irq *irq_ptr)
         int i;
         struct qdio_q *q;
 
-#ifdef QDIO_PERFORMANCE_STATS
-        perf_stats.pcis++;
-        perf_stats.start_time_inbound=NOW;
-#endif /* QDIO_PERFORMANCE_STATS */
+        if (qdio_performance_stats) {
+                perf_stats.pcis++;
+                perf_stats.start_time_inbound=NOW;
+        }
         for (i=0;i<irq_ptr->no_input_qs;i++) {
                 q=irq_ptr->input_qs[i];
                 if (q->is_input_q&QDIO_FLAG_NO_INPUT_INTERRUPT_CONTEXT)
                         qdio_mark_q(q);
                 else {
-#ifdef QDIO_PERFORMANCE_STATS
-                        perf_stats.tl_runs--;
-#endif /* QDIO_PERFORMANCE_STATS */
+                        if (qdio_performance_stats)
+                                perf_stats.tl_runs--;
                         __qdio_inbound_processing(q);
                 }
         }
@@ -1995,11 +1987,10 @@ qdio_handle_pci(struct qdio_irq *irq_ptr)
                 return;
         for (i=0;i<irq_ptr->no_output_qs;i++) {
                 q=irq_ptr->output_qs[i];
-#ifdef QDIO_PERFORMANCE_STATS
-                perf_stats.tl_runs--;
-#endif /* QDIO_PERFORMANCE_STATS */
                 if (qdio_is_outbound_q_done(q))
                         continue;
+                if (qdio_performance_stats)
+                        perf_stats.tl_runs--;
                 if (!irq_ptr->sync_done_on_outb_pcis)
                         SYNC_MEMORY;
                 __qdio_outbound_processing(q);
@@ -2045,11 +2036,13 @@ omit_handler_call:
 }
 
 static void
-qdio_call_shutdown(void *data)
+qdio_call_shutdown(struct work_struct *work)
 {
+        struct ccw_device_private *priv;
         struct ccw_device *cdev;
 
-        cdev = (struct ccw_device *)data;
+        priv = container_of(work, struct ccw_device_private, kick_work);
+        cdev = priv->cdev;
         qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
         put_device(&cdev->dev);
 }
@@ -2091,7 +2084,7 @@ qdio_timeout_handler(struct ccw_device *cdev)
                 if (get_device(&cdev->dev)) {
                         /* Can't call shutdown from interrupt context. */
                         PREPARE_WORK(&cdev->private->kick_work,
-                                     qdio_call_shutdown, (void *)cdev);
+                                     qdio_call_shutdown);
                         queue_work(ccw_device_work, &cdev->private->kick_work);
                 }
                 break;
@@ -3458,19 +3451,18 @@ do_qdio_handle_outbound(struct qdio_q *q, unsigned int callflags,
         struct qdio_irq *irq = (struct qdio_irq *) q->irq_ptr;
 
         /* This is the outbound handling of queues */
-#ifdef QDIO_PERFORMANCE_STATS
-        perf_stats.start_time_outbound=NOW;
-#endif /* QDIO_PERFORMANCE_STATS */
+        if (qdio_performance_stats)
+                perf_stats.start_time_outbound=NOW;
 
         qdio_do_qdio_fill_output(q,qidx,count,buffers);
 
         used_elements=atomic_add_return(count, &q->number_of_buffers_used) - count;
 
         if (callflags&QDIO_FLAG_DONT_SIGA) {
-#ifdef QDIO_PERFORMANCE_STATS
-                perf_stats.outbound_time+=NOW-perf_stats.start_time_outbound;
-                perf_stats.outbound_cnt++;
-#endif /* QDIO_PERFORMANCE_STATS */
+                if (qdio_performance_stats) {
+                        perf_stats.outbound_time+=NOW-perf_stats.start_time_outbound;
+                        perf_stats.outbound_cnt++;
+                }
                 return;
         }
         if (q->is_iqdio_q) {
@@ -3500,9 +3492,8 @@ do_qdio_handle_outbound(struct qdio_q *q, unsigned int callflags,
                                 qdio_kick_outbound_q(q);
                         } else {
                                 QDIO_DBF_TEXT3(0,trace, "fast-req");
-#ifdef QDIO_PERFORMANCE_STATS
-                                perf_stats.fast_reqs++;
-#endif /* QDIO_PERFORMANCE_STATS */
+                                if (qdio_performance_stats)
+                                        perf_stats.fast_reqs++;
                         }
                 }
                 /* 
@@ -3513,10 +3504,10 @@ do_qdio_handle_outbound(struct qdio_q *q, unsigned int callflags,
                 __qdio_outbound_processing(q);
         }
 
-#ifdef QDIO_PERFORMANCE_STATS
-        perf_stats.outbound_time+=NOW-perf_stats.start_time_outbound;
-        perf_stats.outbound_cnt++;
-#endif /* QDIO_PERFORMANCE_STATS */
+        if (qdio_performance_stats) {
+                perf_stats.outbound_time+=NOW-perf_stats.start_time_outbound;
+                perf_stats.outbound_cnt++;
+        }
 }
 
 /* count must be 1 in iqdio */
@@ -3574,7 +3565,6 @@ do_QDIO(struct ccw_device *cdev,unsigned int callflags,
         return 0;
 }
 
-#ifdef QDIO_PERFORMANCE_STATS
 static int
 qdio_perf_procfile_read(char *buffer, char **buffer_location, off_t offset,
                         int buffer_length, int *eof, void *data)
@@ -3590,29 +3580,29 @@ qdio_perf_procfile_read(char *buffer, char **buffer_location, off_t offset,
         _OUTP_IT("i_p_nc/c=%lu/%lu\n",i_p_nc,i_p_c);
         _OUTP_IT("ii_p_nc/c=%lu/%lu\n",ii_p_nc,ii_p_c);
         _OUTP_IT("o_p_nc/c=%lu/%lu\n",o_p_nc,o_p_c);
-        _OUTP_IT("Number of tasklet runs (total)                  : %u\n",
+        _OUTP_IT("Number of tasklet runs (total)                  : %lu\n",
                  perf_stats.tl_runs);
         _OUTP_IT("\n");
-        _OUTP_IT("Number of SIGA sync's issued                    : %u\n",
+        _OUTP_IT("Number of SIGA sync's issued                    : %lu\n",
                  perf_stats.siga_syncs);
-        _OUTP_IT("Number of SIGA in's issued                      : %u\n",
+        _OUTP_IT("Number of SIGA in's issued                      : %lu\n",
                  perf_stats.siga_ins);
-        _OUTP_IT("Number of SIGA out's issued                     : %u\n",
+        _OUTP_IT("Number of SIGA out's issued                     : %lu\n",
                  perf_stats.siga_outs);
-        _OUTP_IT("Number of PCIs caught                           : %u\n",
+        _OUTP_IT("Number of PCIs caught                           : %lu\n",
                  perf_stats.pcis);
-        _OUTP_IT("Number of adapter interrupts caught             : %u\n",
+        _OUTP_IT("Number of adapter interrupts caught             : %lu\n",
                  perf_stats.thinints);
-        _OUTP_IT("Number of fast requeues (outg. SBALs w/o SIGA)  : %u\n",
+        _OUTP_IT("Number of fast requeues (outg. SBALs w/o SIGA)  : %lu\n",
                  perf_stats.fast_reqs);
         _OUTP_IT("\n");
-        _OUTP_IT("Total time of all inbound actions (us) incl. UL : %u\n",
+        _OUTP_IT("Total time of all inbound actions (us) incl. UL : %lu\n",
                  perf_stats.inbound_time);
-        _OUTP_IT("Number of inbound transfers                     : %u\n",
+        _OUTP_IT("Number of inbound transfers                     : %lu\n",
                  perf_stats.inbound_cnt);
-        _OUTP_IT("Total time of all outbound do_QDIOs (us)        : %u\n",
+        _OUTP_IT("Total time of all outbound do_QDIOs (us)        : %lu\n",
                  perf_stats.outbound_time);
-        _OUTP_IT("Number of do_QDIOs outbound                     : %u\n",
+        _OUTP_IT("Number of do_QDIOs outbound                     : %lu\n",
                  perf_stats.outbound_cnt);
         _OUTP_IT("\n");
 
@@ -3620,12 +3610,10 @@ qdio_perf_procfile_read(char *buffer, char **buffer_location, off_t offset,
 }
 
 static struct proc_dir_entry *qdio_perf_proc_file;
-#endif /* QDIO_PERFORMANCE_STATS */
 
 static void
 qdio_add_procfs_entry(void)
 {
-#ifdef QDIO_PERFORMANCE_STATS
         proc_perf_file_registration=0;
         qdio_perf_proc_file=create_proc_entry(QDIO_PERF,
                                               S_IFREG|0444,&proc_root);
@@ -3637,20 +3625,58 @@ qdio_add_procfs_entry(void)
                 QDIO_PRINT_WARN("was not able to register perf. " \
                                 "proc-file (%i).\n",
                                 proc_perf_file_registration);
-#endif /* QDIO_PERFORMANCE_STATS */
 }
 
 static void
 qdio_remove_procfs_entry(void)
 {
-#ifdef QDIO_PERFORMANCE_STATS
         perf_stats.tl_runs=0;
 
         if (!proc_perf_file_registration) /* means if it went ok earlier */
                 remove_proc_entry(QDIO_PERF,&proc_root);
-#endif /* QDIO_PERFORMANCE_STATS */
 }
 
+/**
+ * attributes in sysfs
+ *****************************************************************************/
+
+static ssize_t
+qdio_performance_stats_show(struct bus_type *bus, char *buf)
+{
+        return sprintf(buf, "%i\n", qdio_performance_stats ? 1 : 0);
+}
+
+static ssize_t
+qdio_performance_stats_store(struct bus_type *bus, const char *buf, size_t count)
+{
+        char *tmp;
+        int i;
+
+        i = simple_strtoul(buf, &tmp, 16);
+        if ((i == 0) || (i == 1)) {
+                if (i == qdio_performance_stats)
+                        return count;
+                qdio_performance_stats = i;
+                if (i==0) {
+                        /* reset perf. stat. info */
+                        i_p_nc = 0;
+                        i_p_c = 0;
+                        ii_p_nc = 0;
+                        ii_p_c = 0;
+                        o_p_nc = 0;
+                        o_p_c = 0;
+                        memset(&perf_stats, 0, sizeof(struct qdio_perf_stats));
+                }
+        } else {
+                QDIO_PRINT_WARN("QDIO performance_stats: write 0 or 1 to this file!\n");
+                return -EINVAL;
+        }
+        return count;
+}
+
+static BUS_ATTR(qdio_performance_stats, 0644, qdio_performance_stats_show,
+                        qdio_performance_stats_store);
+
 static void
 tiqdio_register_thinints(void)
 {
@@ -3695,6 +3721,7 @@ qdio_release_qdio_memory(void)
         kfree(indicators);
 }
 
+
 static void
 qdio_unregister_dbf_views(void)
 {
@@ -3796,9 +3823,7 @@ static int __init
 init_QDIO(void)
 {
         int res;
-#ifdef QDIO_PERFORMANCE_STATS
         void *ptr;
-#endif /* QDIO_PERFORMANCE_STATS */
 
         printk("qdio: loading %s\n",version);
 
@@ -3811,13 +3836,12 @@ init_QDIO(void)
                 return res;
 
         QDIO_DBF_TEXT0(0,setup,"initQDIO");
+        res = bus_create_file(&ccw_bus_type, &bus_attr_qdio_performance_stats);
 
-#ifdef QDIO_PERFORMANCE_STATS
-        memset((void*)&perf_stats,0,sizeof(perf_stats));
+        memset((void*)&perf_stats,0,sizeof(perf_stats));
         QDIO_DBF_TEXT0(0,setup,"perfstat");
         ptr=&perf_stats;
         QDIO_DBF_HEX0(0,setup,&ptr,sizeof(void*));
-#endif /* QDIO_PERFORMANCE_STATS */
 
         qdio_add_procfs_entry();
 
@@ -3841,7 +3865,7 @@ cleanup_QDIO(void)
         qdio_release_qdio_memory();
         qdio_unregister_dbf_views();
         mempool_destroy(qdio_mempool_scssc);
-
+        bus_remove_file(&ccw_bus_type, &bus_attr_qdio_performance_stats);
         printk("qdio: %s: module removed\n",version);
 }
 
diff --git a/drivers/s390/cio/qdio.h b/drivers/s390/cio/qdio.h
index 42927c1b745..ec9af72b2af 100644
--- a/drivers/s390/cio/qdio.h
+++ b/drivers/s390/cio/qdio.h
@@ -12,10 +12,6 @@
 #endif /* CONFIG_QDIO_DEBUG */
 #define QDIO_USE_PROCESSING_STATE
 
-#ifdef CONFIG_QDIO_PERF_STATS
-#define QDIO_PERFORMANCE_STATS
-#endif /* CONFIG_QDIO_PERF_STATS */
-
 #define QDIO_MINIMAL_BH_RELIEF_TIME 16
 #define QDIO_TIMER_POLL_VALUE 1
 #define IQDIO_TIMER_POLL_VALUE 1
@@ -409,25 +405,23 @@ do_clear_global_summary(void)
 #define CHSC_FLAG_SIGA_SYNC_DONE_ON_THININTS 0x08
 #define CHSC_FLAG_SIGA_SYNC_DONE_ON_OUTB_PCIS 0x04
 
-#ifdef QDIO_PERFORMANCE_STATS
 struct qdio_perf_stats {
-        unsigned int tl_runs;
+        unsigned long tl_runs;
 
-        unsigned int siga_outs;
-        unsigned int siga_ins;
-        unsigned int siga_syncs;
-        unsigned int pcis;
-        unsigned int thinints;
-        unsigned int fast_reqs;
+        unsigned long siga_outs;
+        unsigned long siga_ins;
+        unsigned long siga_syncs;
+        unsigned long pcis;
+        unsigned long thinints;
+        unsigned long fast_reqs;
 
         __u64 start_time_outbound;
-        unsigned int outbound_cnt;
-        unsigned int outbound_time;
+        unsigned long outbound_cnt;
+        unsigned long outbound_time;
         __u64 start_time_inbound;
-        unsigned int inbound_cnt;
-        unsigned int inbound_time;
+        unsigned long inbound_cnt;
+        unsigned long inbound_time;
 };
-#endif /* QDIO_PERFORMANCE_STATS */
 
 /* unlikely as the later the better */
 #define SYNC_MEMORY if (unlikely(q->siga_sync)) qdio_siga_sync_q(q)
diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index e4dc947e74e..ad60afe5dd1 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -33,6 +33,7 @@
 #include <linux/kthread.h>
 #include <linux/mutex.h>
 #include <asm/s390_rdev.h>
+#include <asm/reset.h>
 
 #include "ap_bus.h"
 
@@ -1128,6 +1129,19 @@ static void ap_poll_thread_stop(void)
         mutex_unlock(&ap_poll_thread_mutex);
 }
 
+static void ap_reset(void)
+{
+        int i, j;
+
+        for (i = 0; i < AP_DOMAINS; i++)
+                for (j = 0; j < AP_DEVICES; j++)
+                        ap_reset_queue(AP_MKQID(j, i));
+}
+
+static struct reset_call ap_reset_call = {
+        .fn = ap_reset,
+};
+
 /**
  * The module initialization code.
  */
@@ -1144,6 +1158,7 @@ int __init ap_module_init(void)
                 printk(KERN_WARNING "AP instructions not installed.\n");
                 return -ENODEV;
         }
+        register_reset_call(&ap_reset_call);
 
         /* Create /sys/bus/ap. */
         rc = bus_register(&ap_bus_type);
@@ -1197,6 +1212,7 @@ out_bus:
                 bus_remove_file(&ap_bus_type, ap_bus_attrs[i]);
         bus_unregister(&ap_bus_type);
 out:
+        unregister_reset_call(&ap_reset_call);
         return rc;
 }
 
@@ -1227,6 +1243,7 @@ void ap_module_exit(void)
         for (i = 0; ap_bus_attrs[i]; i++)
                 bus_remove_file(&ap_bus_type, ap_bus_attrs[i]);
         bus_unregister(&ap_bus_type);
+        unregister_reset_call(&ap_reset_call);
 }
 
 #ifndef CONFIG_ZCRYPT_MONOLITHIC