[S390] dasd: fix device shutdown process.

Fix clear_IO handling (need to wait for interrupt) and
introduced error-handling in shutdown processing.

Signed-off-by: Horst Hummel <horst.hummel@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/drivers/s390/block/dasd_genhd.c b/drivers/s390/block/dasd_genhd.c
index 4c272b70f41a..d163632101d2 100644
--- a/drivers/s390/block/dasd_genhd.c
+++ b/drivers/s390/block/dasd_genhd.c
@@ -83,10 +83,12 @@ dasd_gendisk_alloc(struct dasd_device *device)
 void
 dasd_gendisk_free(struct dasd_device *device)
 {
-        del_gendisk(device->gdp);
-        device->gdp->queue = NULL;
-        put_disk(device->gdp);
-        device->gdp = NULL;
+        if (device->gdp) {
+                del_gendisk(device->gdp);
+                device->gdp->queue = NULL;
+                put_disk(device->gdp);
+                device->gdp = NULL;
+        }
 }
 
 /*