[Kernel] [PATCH OpenHarmony-5.10 09/16] blk-mq: clear active_queues before clearing BLK_MQ_F_TAG_QUEUE_SHARED

From: Yu Kuai <yukuai3(a)huawei.com> mainline inclusion from mainline-5.14-rc6 commit 454bb6775202d94f0f489c4632efecdb62d3c904 category: bugfix issue: #I4LRGQ CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… ------------------------------------------------- We run a test that delete and recover devcies frequently(two devices on the same host), and we found that 'active_queues' is super big after a period of time. If device a and device b share a tag set, and a is deleted, then blk_mq_exit_queue() will clear BLK_MQ_F_TAG_QUEUE_SHARED because there is only one queue that are using the tag set. However, if b is still active, the active_queues of b might never be cleared even if b is deleted. Thus clear active_queues before BLK_MQ_F_TAG_QUEUE_SHARED is cleared. Signed-off-by: Yu Kuai <yukuai3(a)huawei.com> Reviewed-by: Ming Lei <ming.lei(a)redhat.com> Link: https://lore.kernel.org/r/20210731062130.1533893-1-yukuai3@huawei.com Signed-off-by: Jens Axboe <axboe(a)kernel.dk> Reviewed-by: Jason Yan <yanaijie(a)huawei.com> Signed-off-by: Chen Jun <chenjun102(a)huawei.com> Signed-off-by: Zheng Zengkai <zhengzengkai(a)huawei.com> Signed-off-by: Yu Changchun <yuchangchun1(a)huawei.com> --- block/blk-mq.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index 0116f6e928ae..b0e7ec85a41c 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2958,10 +2958,12 @@ static void queue_set_hctx_shared(struct request_queue *q, bool shared) int i; queue_for_each_hw_ctx(q, hctx, i) { - if (shared) + if (shared) { hctx->flags |= BLK_MQ_F_TAG_QUEUE_SHARED; - else + } else { + blk_mq_tag_idle(hctx); hctx->flags &= ~BLK_MQ_F_TAG_QUEUE_SHARED; + } } } -- 2.25.1