diff options
| author | John Garry <john.garry@huawei.com> | 2021-07-27 17:32:53 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-07-27 16:44:38 -0600 |
| commit | b93af3055d6f32d3b0361cfdb110c9399c1241ba (patch) | |
| tree | 6a0f83ecb4efae850ef4fc13dc98da2c707327f2 /block | |
| parent | 3ce6e1f662a910970880188ea7bfd00542bd3934 (diff) | |
| download | linux-b93af3055d6f32d3b0361cfdb110c9399c1241ba.tar.bz2 | |
blk-mq-sched: Fix blk_mq_sched_alloc_tags() error handling
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>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/1627378373-148090-1-git-send-email-john.garry@huawei.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-mq-sched.c | 17 |
1 files changed, 4 insertions, 13 deletions
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; } |