[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>
diff --git a/drivers/s390/block/dasd_genhd.c b/drivers/s390/block/dasd_genhd.c
index 4c272b7..d163632 100644
--- a/drivers/s390/block/dasd_genhd.c
+++ b/drivers/s390/block/dasd_genhd.c
@@ -83,10 +83,12 @@
 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;
+	}
 }
 
 /*