[3.16.y-ckt stable] Patch "SCSI: fix regression in scsi_send_eh_cmnd()" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    SCSI: fix regression in scsi_send_eh_cmnd()

to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.16.y-queue

This patch is scheduled to be released in version 3.16.7-ckt5.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

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>From aa445be13471ed101b093cca4d3a440355cd4ca6 Mon Sep 17 00:00:00 2001
From: Alan Stern <stern at rowland.harvard.edu>
Date: Fri, 21 Nov 2014 10:44:49 -0500
Subject: SCSI: fix regression in scsi_send_eh_cmnd()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

commit 511833acfc06c013d453e288f483c682c60ffbff upstream.

Commit ac61d1955934 (scsi: set correct completion code in
scsi_send_eh_cmnd()) introduced a bug.  It changed the stored return
value from a queuecommand call, but it didn't take into account that
the return value was used again later on.  This patch fixes the bug by
changing the later usage.

There is a big comment in the middle of scsi_send_eh_cmnd() which
does a good job of explaining how the routine works.  But it mentions
a "rtn = FAILURE" value that doesn't exist in the code.  This patch
adjusts the code to match the comment (I assume the comment is right
and the code is wrong).

This fixes Bugzilla #88341.

Signed-off-by: Alan Stern <stern at rowland.harvard.edu>
Reported-by: Андрей Аладьев <aladjev.andrew at gmail.com>
Tested-by: Андрей Аладьев <aladjev.andrew at gmail.com>
Fixes: ac61d19559349e205dad7b5122b281419aa74a82
Acked-by: Hannes Reinecke <hare at suse.de>
Signed-off-by: James Bottomley <JBottomley at Parallels.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/scsi/scsi_error.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index b350eb8ec898..f0c7a970547f 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -1026,7 +1026,7 @@ retry:
 		}
 		/* signal not to enter either branch of the if () below */
 		timeleft = 0;
-		rtn = NEEDS_RETRY;
+		rtn = FAILED;
 	} else {
 		timeleft = wait_for_completion_timeout(&done, timeout);
 		rtn = SUCCESS;
@@ -1067,7 +1067,7 @@ retry:
 			rtn = FAILED;
 			break;
 		}
-	} else if (!rtn) {
+	} else if (rtn != FAILED) {
 		scsi_abort_eh_cmnd(scmd);
 		rtn = FAILED;
 	}
--
2.1.4