[S390] Some preparations for the dynamic subchannel mapping patch.

- Move adding subchannel attributes to css_register_subchannel().
- Don't call device_trigger_reprobe() for non-operational devices.
- Introduce io_subchannel_create_ccwdev().

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

4 files changed, 78 insertions, 47 deletions

diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 26cf2f5ae2e7..55895c83d499 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -135,14 +135,19 @@ css_register_subchannel(struct subchannel *sch)
         sch->dev.parent = &css[0]->device;
         sch->dev.bus = &css_bus_type;
         sch->dev.release = &css_subchannel_release;
-        
+
         /* 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);
+        ret = subchannel_add_files(&sch->dev);
+        if (ret)
+                printk(KERN_WARNING "%s: could not add attributes to %s\n",
+                       __func__, sch->dev.bus_id);
         return ret;
 }
 
diff --git a/drivers/s390/cio/css.h b/drivers/s390/cio/css.h
index dfd5462f993f..ac845c1ebf83 100644
--- a/drivers/s390/cio/css.h
+++ b/drivers/s390/cio/css.h
@@ -189,4 +189,6 @@ extern int need_rescan;
 
 extern struct workqueue_struct *slow_path_wq;
 extern struct work_struct slow_path_work;
+
+int subchannel_add_files (struct device *);
 #endif
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 0f604621de40..e644fd6905ee 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -294,6 +294,18 @@ online_show (struct device *dev, struct device_attribute *attr, char *buf)
         return sprintf(buf, cdev->online ? "1\n" : "0\n");
 }
 
+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)
 {
@@ -498,8 +510,7 @@ static struct attribute_group subch_attr_group = {
         .attrs = subch_attrs,
 };
 
-static inline int
-subchannel_add_files (struct device *dev)
+int subchannel_add_files (struct device *dev)
 {
         return sysfs_create_group(&dev->kobj, &subch_attr_group);
 }
@@ -676,6 +687,55 @@ 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;
+}
+
 /*
  * Register recognized device.
  */
@@ -724,11 +784,6 @@ io_subchannel_register(struct work_struct *work)
                         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;
@@ -851,7 +906,6 @@ 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
@@ -864,28 +918,9 @@ io_subchannel_probe (struct subchannel *sch)
                         get_device(&cdev->dev);
                 return 0;
         }
-        cdev = kzalloc (sizeof(*cdev), GFP_KERNEL);
-        if (!cdev)
-                return -ENOMEM;
-        cdev->private = kzalloc(sizeof(struct ccw_device_private),
-                                GFP_KERNEL | GFP_DMA);
-        if (!cdev->private) {
-                kfree(cdev);
-                return -ENOMEM;
-        }
-        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;
-        }
+        cdev = io_subchannel_create_ccwdev(sch);
+        if (IS_ERR(cdev))
+                return PTR_ERR(cdev);
 
         rc = io_subchannel_recog(cdev, sch);
         if (rc) {
@@ -899,18 +934,6 @@ io_subchannel_probe (struct subchannel *sch)
         return rc;
 }
 
-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 int
 io_subchannel_remove (struct subchannel *sch)
 {
diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c
index 0f0301ce37fe..a487fb0e7d3d 100644
--- a/drivers/s390/cio/device_fsm.c
+++ b/drivers/s390/cio/device_fsm.c
@@ -1106,7 +1106,8 @@ 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 :/