From: Omar Sandoval <osandov@fb.com>
Date: Thu, 9 Jun 2016 01:22:20 +0000 (-0700)
Subject: blk-mq: actually hook up defer list when running requests
X-Git-Tag: v4.7.7~67
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=efa079a92395c01d927bc5221c90dff2ec5003e9;p=thirdparty%2Fkernel%2Fstable.git

blk-mq: actually hook up defer list when running requests

commit 52b9c330c6a8a4b5a1819bdaddf4ec76ab571e81 upstream.

If ->queue_rq() returns BLK_MQ_RQ_QUEUE_OK, we use continue and skip
over the rest of the loop body. However, dptr is assigned later in the
loop body, and the BLK_MQ_RQ_QUEUE_OK case is exactly the case that we'd
want it for.

NVMe isn't actually using BLK_MQ_F_DEFER_ISSUE yet, nor is any other
in-tree driver, but if the code's going to be there, it might as well
work.

Fixes: 74c450521dd8 ("blk-mq: add a 'list' parameter to ->queue_rq()")
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/block/blk-mq.c b/block/blk-mq.c
index f9b9049b1284c..27dafb3a7a0ea 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -784,7 +784,7 @@ static void __blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx)
 		switch (ret) {
 		case BLK_MQ_RQ_QUEUE_OK:
 			queued++;
-			continue;
+			break;
 		case BLK_MQ_RQ_QUEUE_BUSY:
 			list_add(&rq->queuelist, &rq_list);
 			__blk_mq_requeue_request(rq);