From: John Garry <john.garry@huawei.com>
To: <axboe@kernel.dk>
Cc: <osandov@fb.com>, <linux-block@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <ming.lei@redhat.com>,
John Garry <john.garry@huawei.com>
Subject: [PATCH] blk-mq-sched: Fix blk_mq_sched_alloc_tags() error handling
Date: Tue, 27 Jul 2021 17:32:53 +0800 [thread overview]
Message-ID: <1627378373-148090-1-git-send-email-john.garry@huawei.com> (raw)
If the blk_mq_sched_alloc_tags() -> blk_mq_alloc_rqs() call fails, then we
call blk_mq_sched_free_tags() -> blk_mq_free_rqs().
It is incorrect to do so, as any rqs would have already been freed in the
blk_mq_alloc_rqs() call.
Fix by calling blk_mq_free_rq_map() only directly.
Fixes: 6917ff0b5bd41 ("blk-mq-sched: refactor scheduler initialization")
Signed-off-by: John Garry <john.garry@huawei.com>
diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index c838d81ac058..0f006cabfd91 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -515,17 +515,6 @@ void blk_mq_sched_insert_requests(struct blk_mq_hw_ctx *hctx,
percpu_ref_put(&q->q_usage_counter);
}
-static void blk_mq_sched_free_tags(struct blk_mq_tag_set *set,
- struct blk_mq_hw_ctx *hctx,
- unsigned int hctx_idx)
-{
- if (hctx->sched_tags) {
- blk_mq_free_rqs(set, hctx->sched_tags, hctx_idx);
- blk_mq_free_rq_map(hctx->sched_tags, set->flags);
- hctx->sched_tags = NULL;
- }
-}
-
static int blk_mq_sched_alloc_tags(struct request_queue *q,
struct blk_mq_hw_ctx *hctx,
unsigned int hctx_idx)
@@ -539,8 +528,10 @@ static int blk_mq_sched_alloc_tags(struct request_queue *q,
return -ENOMEM;
ret = blk_mq_alloc_rqs(set, hctx->sched_tags, hctx_idx, q->nr_requests);
- if (ret)
- blk_mq_sched_free_tags(set, hctx, hctx_idx);
+ if (ret) {
+ blk_mq_free_rq_map(hctx->sched_tags, set->flags);
+ hctx->sched_tags = NULL;
+ }
return ret;
}
--
2.26.2
next reply other threads:[~2021-07-27 9:37 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-27 9:32 John Garry [this message]
2021-07-27 10:06 ` [PATCH] blk-mq-sched: Fix blk_mq_sched_alloc_tags() error handling Ming Lei
2021-07-27 10:30 ` John Garry
2021-07-27 10:43 ` Ming Lei
2021-07-27 22:44 ` Jens Axboe
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