From: Jaesoo Lee <ja...@purestorage.com>
commit be549d49115422f846b6d96ee8fd7173a5f7ceb0 upstream.
When SCSI blk-mq is enabled, there is a bug in handling errors in
scsi_queue_rq. Specifically, the bug is not setting result field of
scsi_request correctly when the dispatch of the command has been
failed. Since the upper layer code including the sg_io ioctl expects to
receive any error status from result field of scsi_request, the error is
silently ignored and this could cause data corruptions for some
applications.
Fixes: d285203cf647 ("scsi: add support for a blk-mq based I/O path.")
Cc: <sta...@vger.kernel.org>
Signed-off-by: Jaesoo Lee <ja...@purestorage.com>
Reviewed-by: Hannes Reinecke <h...@suse.com>
Reviewed-by: Bart Van Assche <bvanass...@acm.org>
Signed-off-by: Martin K. Petersen <martin.peter...@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/scsi/scsi_lib.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2050,8 +2050,12 @@ out:
blk_mq_delay_run_hw_queue(hctx, SCSI_QUEUE_DELAY);
break;
default:
+ if (unlikely(!scsi_device_online(sdev)))
+ scsi_req(req)->result = DID_NO_CONNECT << 16;
+ else
+ scsi_req(req)->result = DID_ERROR << 16;
/*
- * Make sure to release all allocated ressources when
+ * Make sure to release all allocated resources when
* we hit an error, as we will never see this command
* again.
*/
