linux-kernel - [PATCH RESEND v3 01/13] blk-mq: Change rqs check in blk_mq_free

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Date:   Mon, 13 Sep 2021 23:12:18 +0800
From:   John Garry <john.garry@...wei.com>
To:     <axboe@...nel.dk>
CC:     <linux-kernel@...r.kernel.org>, <linux-block@...r.kernel.org>,
        <ming.lei@...hat.com>, <linux-scsi@...r.kernel.org>,
        John Garry <john.garry@...wei.com>
Subject: [PATCH RESEND v3 01/13] blk-mq: Change rqs check in blk_mq_free_rqs()

The original code in commit 24d2f90309b23 ("blk-mq: split out tag
initialization, support shared tags") would check tags->rqs is non-NULL and
then dereference tags->rqs[].

Then in commit 2af8cbe30531 ("blk-mq: split tag ->rqs[] into two"), we
started to dereference tags->static_rqs[], but continued to check non-NULL
tags->rqs.

Check tags->static_rqs as non-NULL instead, which is more logical.

Signed-off-by: John Garry <john.garry@...wei.com>
Reviewed-by: Ming Lei <ming.lei@...hat.com>
---
 block/blk-mq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 108a352051be..2316ff27c1f5 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2340,7 +2340,7 @@ void blk_mq_free_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
 {
 	struct page *page;
 
-	if (tags->rqs && set->ops->exit_request) {
+	if (tags->static_rqs && set->ops->exit_request) {
 		int i;
 
 		for (i = 0; i < tags->nr_tags; i++) {
-- 
2.26.2