scsi: core: Complain if scsi_target_block() fails

If scsi_target_block() fails that can break the code that calls this
function. Hence complain loudly if scsi_target_block() fails.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Cc: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 7a4ac7a..d47d637 100644 (file)
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2772,7 +2772,12 @@ static int scsi_internal_device_unblock(struct scsi_device *sdev,
 static void
 device_block(struct scsi_device *sdev, void *data)
 {
-       scsi_internal_device_block(sdev);
+       int ret;
+
+       ret = scsi_internal_device_block(sdev);
+
+       WARN_ONCE(ret, "scsi_internal_device_block(%s) failed: ret = %d\n",
+                 dev_name(&sdev->sdev_gendev), ret);
 }
 
 static int