From: Jaesoo Lee <jalee@purestorage.com>
Date: Tue, 9 Apr 2019 17:02:22 -0700
Subject: scsi: core: set result when the command cannot be dispatched
Git-commit: be549d49115422f846b6d96ee8fd7173a5f7ceb0
Patch-mainline: v5.1-rc6
References: git-fixes
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: <stable@vger.kernel.org>
Signed-off-by: Jaesoo Lee <jalee@purestorage.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Lee Duncan <lduncan@suse.com>
---
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
@@ -2098,8 +2098,12 @@ out_put_budget:
ret = BLK_STS_DEV_RESOURCE;
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.
*/