[S390] cio: Introduce subchannel->private.

Introduce a private pointer in struct subchannel to store
per-subchannel type data (cannot use dev->priv since this
is already used for something else).

Create a new header io_sch.h for I/O subchannel specific structures
and instructions.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 14 insertions, 2 deletions

diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 7bccca9684e5..30fe59cc28c9 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -28,6 +28,7 @@
 #include "css.h"
 #include "device.h"
 #include "ioasm.h"
+#include "io_sch.h"
 
 /******************* bus type handling ***********************/
 
@@ -1143,6 +1144,11 @@ io_subchannel_probe (struct subchannel *sch)
          */
         dev_id.devno = sch->schib.pmcw.dev;
         dev_id.ssid = sch->schid.ssid;
+        /* Allocate I/O subchannel private data. */
+        sch->private = kzalloc(sizeof(struct io_subchannel_private),
+                               GFP_KERNEL | GFP_DMA);
+        if (!sch->private)
+                return -ENOMEM;
         cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL);
         if (!cdev)
                 cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent),
@@ -1160,9 +1166,10 @@ io_subchannel_probe (struct subchannel *sch)
                 return 0;
         }
         cdev = io_subchannel_create_ccwdev(sch);
-        if (IS_ERR(cdev))
+        if (IS_ERR(cdev)) {
+                kfree(sch->private);
                 return PTR_ERR(cdev);
-
+        }
         rc = io_subchannel_recog(cdev, sch);
         if (rc) {
                 spin_lock_irqsave(sch->lock, flags);
@@ -1170,6 +1177,7 @@ io_subchannel_probe (struct subchannel *sch)
                 spin_unlock_irqrestore(sch->lock, flags);
                 if (cdev->dev.release)
                         cdev->dev.release(&cdev->dev);
+                kfree(sch->private);
         }
 
         return rc;
@@ -1191,6 +1199,7 @@ io_subchannel_remove (struct subchannel *sch)
         spin_unlock_irqrestore(cdev->ccwlock, flags);
         ccw_device_unregister(cdev);
         put_device(&cdev->dev);
+        kfree(sch->private);
         return 0;
 }
 
@@ -1279,6 +1288,9 @@ ccw_device_console_enable (struct ccw_device *cdev, struct subchannel *sch)
 {
         int rc;
 
+        /* Attach subchannel private data. */
+        sch->private = cio_get_console_priv();
+        memset(sch->private, 0, sizeof(struct io_subchannel_private));
         /* Initialize the ccw_device structure. */
         cdev->dev.parent= &sch->dev;
         rc = io_subchannel_recog(cdev, sch);