s390/block/dasd: remove obsolete while -EBUSY loop

With the mutex_trylock bit gone from blkdev_reread_part(), the retry logic
in dasd_scan_partitions() shouldn't be necessary.

CC: Christoph Hellwig <[email protected]>
CC: Jens Axboe <[email protected]>
CC: Tejun Heo <[email protected]>
CC: Alexander Viro <[email protected]>
CC: Markus Pargmann <[email protected]>
CC: Stefan Weinhuber <[email protected]>
CC: Stefan Haberland <[email protected]>
CC: Sebastian Ott <[email protected]>
CC: Fabian Frederick <[email protected]>
CC: Ming Lei <[email protected]>
CC: David Herrmann <[email protected]>
CC: Andrew Morton <[email protected]>
CC: Peter Zijlstra <[email protected]>
CC: [email protected]
CC: [email protected]
Reviewed-by: Christoph Hellwig <[email protected]>
Acked-by: Sebastian Ott <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
Signed-off-by: Jarod Wilson <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>

drivers/s390/block/dasd_genhd.c

@@ -99,9 +99,8 @@ void dasd_gendisk_free(struct dasd_block *block)
 int dasd_scan_partitions(struct dasd_block *block)
 {
 	struct block_device *bdev;
-	int retry, rc;
+	int rc;
 
-	retry = 5;
 	bdev = bdget_disk(block->gdp, 0);
 	if (!bdev) {
 		DBF_DEV_EVENT(DBF_ERR, block->base, "%s",
@@ -118,14 +117,9 @@ int dasd_scan_partitions(struct dasd_block *block)
 	}
 
 	rc = blkdev_reread_part(bdev);
-	while (rc == -EBUSY && retry > 0) {
-		schedule();
-		rc = blkdev_reread_part(bdev);
-		retry--;
+	if (rc)
 		DBF_DEV_EVENT(DBF_ERR, block->base,
-			      "scan partitions error, retry %d rc %d",
-			      retry, rc);
-	}
+				"scan partitions error, rc %d", rc);
 
 	/*
 	 * Since the matching blkdev_put call to the blkdev_get in