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] Change atomic_read/set to inline functions with barrier semantics.
  [S390] kprobes: fix instruction length calculation
  [S390] hypfs: inode corruption due to missing locking
  [S390] disassembler: fix b2 opcodes like srst, bsg, and others
  [S390] vmur: fix reference counting for vmur device structure
  [S390] vmur: fix diag14 exceptions with addresses > 2GB.
  [S390] qdio: Refresh buffer states for IQDIO Asynchronous output queue
  [S390] qdio: fix EQBS handling on CCQ96
  [S390] cio: change confusing message in cmf.
  [S390] cio: dont forget to set last slot to NULL in ccw_uevent().

8 files changed, 179 insertions, 142 deletions

diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c
index eccac1c3b71b..d32c60dbdd82 100644
--- a/drivers/s390/block/dasd_diag.c
+++ b/drivers/s390/block/dasd_diag.c
@@ -24,6 +24,7 @@
 #include <asm/s390_ext.h>
 #include <asm/todclk.h>
 #include <asm/vtoc.h>
+#include <asm/diag.h>
 
 #include "dasd_int.h"
 #include "dasd_diag.h"
diff --git a/drivers/s390/char/raw3270.c b/drivers/s390/char/raw3270.c
index 4f2f81b16cfa..2edd5fb6d3dc 100644
--- a/drivers/s390/char/raw3270.c
+++ b/drivers/s390/char/raw3270.c
@@ -21,6 +21,7 @@
 #include <asm/ccwdev.h>
 #include <asm/cio.h>
 #include <asm/ebcdic.h>
+#include <asm/diag.h>
 
 #include "raw3270.h"
 
diff --git a/drivers/s390/char/vmur.c b/drivers/s390/char/vmur.c
index 04b19bdc09da..d70a6e65bf14 100644
--- a/drivers/s390/char/vmur.c
+++ b/drivers/s390/char/vmur.c
@@ -14,6 +14,7 @@
 #include <asm/cio.h>
 #include <asm/ccwdev.h>
 #include <asm/debug.h>
+#include <asm/diag.h>
 
 #include "vmur.h"
 
@@ -68,8 +69,26 @@ static struct ccw_driver ur_driver = {
         .set_offline    = ur_set_offline,
 };
 
+static DEFINE_MUTEX(vmur_mutex);
+
 /*
  * Allocation, freeing, getting and putting of urdev structures
+ *
+ * Each ur device (urd) contains a reference to its corresponding ccw device
+ * (cdev) using the urd->cdev pointer. Each ccw device has a reference to the
+ * ur device using the cdev->dev.driver_data pointer.
+ *
+ * urd references:
+ * - ur_probe gets a urd reference, ur_remove drops the reference
+ *   (cdev->dev.driver_data)
+ * - ur_open gets a urd reference, ur_relase drops the reference
+ *   (urf->urd)
+ *
+ * cdev references:
+ * - urdev_alloc get a cdev reference (urd->cdev)
+ * - urdev_free drops the cdev reference (urd->cdev)
+ *
+ * Setting and clearing of cdev->dev.driver_data is protected by the ccwdev lock
  */
 static struct urdev *urdev_alloc(struct ccw_device *cdev)
 {
@@ -78,42 +97,61 @@ static struct urdev *urdev_alloc(struct ccw_device *cdev)
         urd = kzalloc(sizeof(struct urdev), GFP_KERNEL);
         if (!urd)
                 return NULL;
-        urd->cdev = cdev;
         urd->reclen = cdev->id.driver_info;
         ccw_device_get_id(cdev, &urd->dev_id);
         mutex_init(&urd->io_mutex);
         mutex_init(&urd->open_mutex);
+        atomic_set(&urd->ref_count,  1);
+        urd->cdev = cdev;
+        get_device(&cdev->dev);
         return urd;
 }
 
 static void urdev_free(struct urdev *urd)
 {
+        TRACE("urdev_free: %p\n", urd);
+        if (urd->cdev)
+                put_device(&urd->cdev->dev);
         kfree(urd);
 }
 
-/*
- * This is how the character device driver gets a reference to a
- * ur device. When this call returns successfully, a reference has
- * been taken (by get_device) on the underlying kobject. The recipient
- * of this urdev pointer must eventually drop it with urdev_put(urd)
- * which does the corresponding put_device().
- */
+static void urdev_get(struct urdev *urd)
+{
+        atomic_inc(&urd->ref_count);
+}
+
+static struct urdev *urdev_get_from_cdev(struct ccw_device *cdev)
+{
+        struct urdev *urd;
+        unsigned long flags;
+
+        spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
+        urd = cdev->dev.driver_data;
+        if (urd)
+                urdev_get(urd);
+        spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
+        return urd;
+}
+
 static struct urdev *urdev_get_from_devno(u16 devno)
 {
         char bus_id[16];
         struct ccw_device *cdev;
+        struct urdev *urd;
 
         sprintf(bus_id, "0.0.%04x", devno);
         cdev = get_ccwdev_by_busid(&ur_driver, bus_id);
         if (!cdev)
                 return NULL;
-
-        return cdev->dev.driver_data;
+        urd = urdev_get_from_cdev(cdev);
+        put_device(&cdev->dev);
+        return urd;
 }
 
 static void urdev_put(struct urdev *urd)
 {
-        put_device(&urd->cdev->dev);
+        if (atomic_dec_and_test(&urd->ref_count))
+                urdev_free(urd);
 }
 
 /*
@@ -245,6 +283,7 @@ static void ur_int_handler(struct ccw_device *cdev, unsigned long intparm,
                 return;
         }
         urd = cdev->dev.driver_data;
+        BUG_ON(!urd);
         /* On special conditions irb is an error pointer */
         if (IS_ERR(irb))
                 urd->io_request_rc = PTR_ERR(irb);
@@ -262,9 +301,15 @@ static void ur_int_handler(struct ccw_device *cdev, unsigned long intparm,
 static ssize_t ur_attr_reclen_show(struct device *dev,
                                    struct device_attribute *attr, char *buf)
 {
-        struct urdev *urd = dev->driver_data;
+        struct urdev *urd;
+        int rc;
 
-        return sprintf(buf, "%zu\n", urd->reclen);
+        urd = urdev_get_from_cdev(to_ccwdev(dev));
+        if (!urd)
+                return -ENODEV;
+        rc = sprintf(buf, "%zu\n", urd->reclen);
+        urdev_put(urd);
+        return rc;
 }
 
 static DEVICE_ATTR(reclen, 0444, ur_attr_reclen_show, NULL);
@@ -379,31 +424,6 @@ static ssize_t ur_write(struct file *file, const char __user *udata,
         return do_write(urf->urd, udata, count, urf->dev_reclen, ppos);
 }
 
-static int do_diag_14(unsigned long rx, unsigned long ry1,
-                      unsigned long subcode)
-{
-        register unsigned long _ry1 asm("2") = ry1;
-        register unsigned long _ry2 asm("3") = subcode;
-        int rc = 0;
-
-        asm volatile(
-#ifdef CONFIG_64BIT
-                "   sam31\n"
-                "   diag    %2,2,0x14\n"
-                "   sam64\n"
-#else
-                "   diag    %2,2,0x14\n"
-#endif
-                "   ipm     %0\n"
-                "   srl     %0,28\n"
-                : "=d" (rc), "+d" (_ry2)
-                : "d" (rx), "d" (_ry1)
-                : "cc");
-
-        TRACE("diag 14: subcode=0x%lx, cc=%i\n", subcode, rc);
-        return rc;
-}
-
 /*
  * diagnose code 0x14 subcode 0x0028 - position spool file to designated
  *                                     record
@@ -415,7 +435,7 @@ static int diag_position_to_record(int devno, int record)
 {
         int cc;
 
-        cc = do_diag_14(record, devno, 0x28);
+        cc = diag14(record, devno, 0x28);
         switch (cc) {
         case 0:
                 return 0;
@@ -440,7 +460,7 @@ static int diag_read_file(int devno, char *buf)
 {
         int cc;
 
-        cc = do_diag_14((unsigned long) buf, devno, 0x00);
+        cc = diag14((unsigned long) buf, devno, 0x00);
         switch (cc) {
         case 0:
                 return 0;
@@ -533,7 +553,7 @@ static int diag_read_next_file_info(struct file_control_block *buf, int spid)
 {
         int cc;
 
-        cc = do_diag_14((unsigned long) buf, spid, 0xfff);
+        cc = diag14((unsigned long) buf, spid, 0xfff);
         switch (cc) {
         case 0:
                 return 0;
@@ -750,64 +770,63 @@ static struct file_operations ur_fops = {
 
 /*
  * ccw_device infrastructure:
- *     ur_probe gets its own ref to the device (i.e. get_device),
- *     creates the struct urdev, the device attributes, sets up
- *     the interrupt handler and validates the virtual unit record device.
- *     ur_remove removes the device attributes, frees the struct urdev
- *     and drops (put_device) the ref to the device we got in ur_probe.
+ *     ur_probe creates the struct urdev (with refcount = 1), the device
+ *     attributes, sets up the interrupt handler and validates the virtual
+ *     unit record device.
+ *     ur_remove removes the device attributes and drops the reference to
+ *     struct urdev.
+ *
+ *     ur_probe, ur_remove, ur_set_online and ur_set_offline are serialized
+ *     by the vmur_mutex lock.
+ *
+ *     urd->char_device is used as indication that the online function has
+ *     been completed successfully.
  */
 static int ur_probe(struct ccw_device *cdev)
 {
         struct urdev *urd;
         int rc;
 
-        TRACE("ur_probe: cdev=%p state=%d\n", cdev, *(int *) cdev->private);
-
-        if (!get_device(&cdev->dev))
-                return -ENODEV;
+        TRACE("ur_probe: cdev=%p\n", cdev);
 
+        mutex_lock(&vmur_mutex);
         urd = urdev_alloc(cdev);
         if (!urd) {
                 rc = -ENOMEM;
-                goto fail;
+                goto fail_unlock;
         }
+
         rc = ur_create_attributes(&cdev->dev);
         if (rc) {
                 rc = -ENOMEM;
-                goto fail;
+                goto fail_urdev_put;
         }
-        cdev->dev.driver_data = urd;
         cdev->handler = ur_int_handler;
 
         /* validate virtual unit record device */
         urd->class = get_urd_class(urd);
         if (urd->class < 0) {
                 rc = urd->class;
-                goto fail;
+                goto fail_remove_attr;
         }
         if ((urd->class != DEV_CLASS_UR_I) && (urd->class != DEV_CLASS_UR_O)) {
                 rc = -ENOTSUPP;
-                goto fail;
+                goto fail_remove_attr;
         }
+        spin_lock_irq(get_ccwdev_lock(cdev));
+        cdev->dev.driver_data = urd;
+        spin_unlock_irq(get_ccwdev_lock(cdev));
 
+        mutex_unlock(&vmur_mutex);
         return 0;
 
-fail:
-        urdev_free(urd);
-        put_device(&cdev->dev);
-        return rc;
-}
-
-static void ur_remove(struct ccw_device *cdev)
-{
-        struct urdev *urd = cdev->dev.driver_data;
-
-        TRACE("ur_remove\n");
-        if (cdev->online)
-                ur_set_offline(cdev);
+fail_remove_attr:
         ur_remove_attributes(&cdev->dev);
-        urdev_free(urd);
-        put_device(&cdev->dev);
+fail_urdev_put:
+        urdev_put(urd);
+fail_unlock:
+        mutex_unlock(&vmur_mutex);
+        return rc;
 }
 
 static int ur_set_online(struct ccw_device *cdev)
@@ -816,20 +835,29 @@ static int ur_set_online(struct ccw_device *cdev)
         int minor, major, rc;
         char node_id[16];
 
-        TRACE("ur_set_online: cdev=%p state=%d\n", cdev,
-              *(int *) cdev->private);
+        TRACE("ur_set_online: cdev=%p\n", cdev);
 
-        if (!try_module_get(ur_driver.owner))
-                return -EINVAL;
+        mutex_lock(&vmur_mutex);
+        urd = urdev_get_from_cdev(cdev);
+        if (!urd) {
+                /* ur_remove already deleted our urd */
+                rc = -ENODEV;
+                goto fail_unlock;
+        }
+
+        if (urd->char_device) {
+                /* Another ur_set_online was faster */
+                rc = -EBUSY;
+                goto fail_urdev_put;
+        }
 
-        urd = (struct urdev *) cdev->dev.driver_data;
         minor = urd->dev_id.devno;
         major = MAJOR(ur_first_dev_maj_min);
 
         urd->char_device = cdev_alloc();
         if (!urd->char_device) {
                 rc = -ENOMEM;
-                goto fail_module_put;
+                goto fail_urdev_put;
         }
 
         cdev_init(urd->char_device, &ur_fops);
@@ -858,29 +886,79 @@ static int ur_set_online(struct ccw_device *cdev)
                 TRACE("ur_set_online: device_create rc=%d\n", rc);
                 goto fail_free_cdev;
         }
-
+        urdev_put(urd);
+        mutex_unlock(&vmur_mutex);
         return 0;
 
 fail_free_cdev:
         cdev_del(urd->char_device);
-fail_module_put:
-        module_put(ur_driver.owner);
-
+        urd->char_device = NULL;
+fail_urdev_put:
+        urdev_put(urd);
+fail_unlock:
+        mutex_unlock(&vmur_mutex);
         return rc;
 }
 
-static int ur_set_offline(struct ccw_device *cdev)
+static int ur_set_offline_force(struct ccw_device *cdev, int force)
 {
         struct urdev *urd;
+        int rc;
 
-        TRACE("ur_set_offline: cdev=%p cdev->private=%p state=%d\n",
-                cdev, cdev->private, *(int *) cdev->private);
-        urd = (struct urdev *) cdev->dev.driver_data;
+        TRACE("ur_set_offline: cdev=%p\n", cdev);
+        urd = urdev_get_from_cdev(cdev);
+        if (!urd)
+                /* ur_remove already deleted our urd */
+                return -ENODEV;
+        if (!urd->char_device) {
+                /* Another ur_set_offline was faster */
+                rc = -EBUSY;
+                goto fail_urdev_put;
+        }
+        if (!force && (atomic_read(&urd->ref_count) > 2)) {
+                /* There is still a user of urd (e.g. ur_open) */
+                TRACE("ur_set_offline: BUSY\n");
+                rc = -EBUSY;
+                goto fail_urdev_put;
+        }
         device_destroy(vmur_class, urd->char_device->dev);
         cdev_del(urd->char_device);
-        module_put(ur_driver.owner);
+        urd->char_device = NULL;
+        rc = 0;
 
-        return 0;
+fail_urdev_put:
+        urdev_put(urd);
+        return rc;
+}
+
+static int ur_set_offline(struct ccw_device *cdev)
+{
+        int rc;
+
+        mutex_lock(&vmur_mutex);
+        rc = ur_set_offline_force(cdev, 0);
+        mutex_unlock(&vmur_mutex);
+        return rc;
+}
+
+static void ur_remove(struct ccw_device *cdev)
+{
+        unsigned long flags;
+
+        TRACE("ur_remove\n");
+
+        mutex_lock(&vmur_mutex);
+
+        if (cdev->online)
+                ur_set_offline_force(cdev, 1);
+        ur_remove_attributes(&cdev->dev);
+
+        spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
+        urdev_put(cdev->dev.driver_data);
+        cdev->dev.driver_data = NULL;
+        spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
+
+        mutex_unlock(&vmur_mutex);
 }
 
 /*
diff --git a/drivers/s390/char/vmur.h b/drivers/s390/char/vmur.h
index 2b3c564e0472..fa959644735a 100644
--- a/drivers/s390/char/vmur.h
+++ b/drivers/s390/char/vmur.h
@@ -70,6 +70,7 @@ struct urdev {
         size_t reclen;                  /* Record length for *write* CCWs */
         int class;                      /* VM device class */
         int io_request_rc;              /* return code from I/O request */
+        atomic_t ref_count;             /* reference counter */
 };
 
 /*
diff --git a/drivers/s390/cio/cmf.c b/drivers/s390/cio/cmf.c
index 02fd00b55e1b..34a796913b06 100644
--- a/drivers/s390/cio/cmf.c
+++ b/drivers/s390/cio/cmf.c
@@ -594,6 +594,9 @@ alloc_cmb (struct ccw_device *cdev)
                         free_pages((unsigned long)mem, get_order(size));
                 } else if (!mem) {
                         /* no luck */
+                        printk(KERN_WARNING "cio: failed to allocate area "
+                               "for measuring %d subchannels\n",
+                               cmb_area.num_channels);
                         ret = -ENOMEM;
                         goto out;
                 } else {
@@ -1279,13 +1282,6 @@ init_cmf(void)
         case CMF_BASIC:
                 format_string = "basic";
                 cmbops = &cmbops_basic;
-                if (cmb_area.num_channels > 4096 || cmb_area.num_channels < 1) {
-                        printk(KERN_ERR "cio: Basic channel measurement "
-                               "facility can only use 1 to 4096 devices\n"
-                               KERN_ERR "when the cmf driver is built"
-                               " as a loadable module\n");
-                        return 1;
-                }
                 break;
         case CMF_EXTENDED:
                 format_string = "extended";
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 297659fa0e26..e44d92eac8e9 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -117,7 +117,10 @@ static int ccw_uevent(struct device *dev, char **envp, int num_envp,
         snprint_alias(modalias_buf, sizeof(modalias_buf), id, "");
         ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
                              "MODALIAS=%s", modalias_buf);
-        return ret;
+        if (ret)
+                return ret;
+        envp[i] = NULL;
+        return 0;
 }
 
 struct bus_type ccw_bus_type;
diff --git a/drivers/s390/cio/device_id.c b/drivers/s390/cio/device_id.c
index 60b9347f7c92..f232832f2b22 100644
--- a/drivers/s390/cio/device_id.c
+++ b/drivers/s390/cio/device_id.c
@@ -17,6 +17,7 @@
 #include <asm/delay.h>
 #include <asm/cio.h>
 #include <asm/lowcore.h>
+#include <asm/diag.h>
 
 #include "cio.h"
 #include "cio_debug.h"
@@ -25,51 +26,6 @@
 #include "ioasm.h"
 
 /*
- * diag210 is used under VM to get information about a virtual device
- */
-int
-diag210(struct diag210 * addr)
-{
-        /*
-         * diag 210 needs its data below the 2GB border, so we
-         * use a static data area to be sure
-         */
-        static struct diag210 diag210_tmp;
-        static DEFINE_SPINLOCK(diag210_lock);
-        unsigned long flags;
-        int ccode;
-
-        spin_lock_irqsave(&diag210_lock, flags);
-        diag210_tmp = *addr;
-
-#ifdef CONFIG_64BIT
-        asm volatile(
-                "       lhi     %0,-1\n"
-                "       sam31\n"
-                "       diag    %1,0,0x210\n"
-                "0:     ipm     %0\n"
-                "       srl     %0,28\n"
-                "1:     sam64\n"
-                EX_TABLE(0b,1b)
-                : "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");
-#else
-        asm volatile(
-                "       lhi     %0,-1\n"
-                "       diag    %1,0,0x210\n"
-                "0:     ipm     %0\n"
-                "       srl     %0,28\n"
-                "1:\n"
-                EX_TABLE(0b,1b)
-                : "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");
-#endif
-
-        *addr = diag210_tmp;
-        spin_unlock_irqrestore(&diag210_lock, flags);
-
-        return ccode;
-}
-
-/*
  * Input :
  *   devno - device number
  *   ps    - pointer to sense ID data area
@@ -349,5 +305,3 @@ ccw_device_sense_id_irq(struct ccw_device *cdev, enum dev_event dev_event)
                 break;
         }
 }
-
-EXPORT_SYMBOL(diag210);
diff --git a/drivers/s390/cio/qdio.c b/drivers/s390/cio/qdio.c
index 03347aed2b3e..d8d479876ec7 100644
--- a/drivers/s390/cio/qdio.c
+++ b/drivers/s390/cio/qdio.c
@@ -195,6 +195,8 @@ qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
 again:
         ccq = do_eqbs(irq->sch_token, state, q_no, start, cnt);
         rc = qdio_check_ccq(q, ccq);
+        if ((ccq == 96) && (tmp_cnt != *cnt))
+                rc = 0;
         if (rc == 1) {
                 QDIO_DBF_TEXT5(1,trace,"eqAGAIN");
                 goto again;
@@ -740,7 +742,8 @@ qdio_get_outbound_buffer_frontier(struct qdio_q *q)
         first_not_to_check=f+qdio_min(atomic_read(&q->number_of_buffers_used),
                                       (QDIO_MAX_BUFFERS_PER_Q-1));
 
-        if ((!q->is_iqdio_q)&&(!q->hydra_gives_outbound_pcis))
+        if (((!q->is_iqdio_q) && (!q->hydra_gives_outbound_pcis)) ||
+                 (q->queue_type == QDIO_IQDIO_QFMT_ASYNCH))
                 SYNC_MEMORY;
 
 check_next: