linux-kernel - [PATCH 3.16 011/114] s390/scm_blk: fix deadlock for requests != REQ_TYPE

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Message-ID: <lsq.1465842997.899456049@decadent.org.uk>
Date:	Mon, 13 Jun 2016 19:36:37 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Sebastian Ott" <sebott@...ux.vnet.ibm.com>,
	"Martin Schwidefsky" <schwidefsky@...ibm.com>,
	"Peter Oberparleiter" <oberpar@...ux.vnet.ibm.com>
Subject: [PATCH 3.16 011/114] s390/scm_blk: fix deadlock for requests !=
 REQ_TYPE_FS

3.16.36-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Sebastian Ott <sebott@...ux.vnet.ibm.com>

commit b707c65ae70e24c47a0ce4a7279224ce8f0ffb7f upstream.

When we refuse a non REQ_TYPE_FS request in the build request function
we already hold the queue lock. Thus we must not call blk_end_request_all
but __blk_end_request_all.

Reported-by: Peter Oberparleiter <oberpar@...ux.vnet.ibm.com>
Fixes: de9587a ('s390/scm_blk: fix endless loop for requests != REQ_TYPE_FS')
Signed-off-by: Sebastian Ott <sebott@...ux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/s390/block/scm_blk.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/s390/block/scm_blk.c
+++ b/drivers/s390/block/scm_blk.c
@@ -210,7 +210,7 @@ static void scm_blk_request(struct reque
 		if (req->cmd_type != REQ_TYPE_FS) {
 			blk_start_request(req);
 			blk_dump_rq_flags(req, KMSG_COMPONENT " bad request");
-			blk_end_request_all(req, -EIO);
+			__blk_end_request_all(req, -EIO);
 			continue;
 		}