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authorMing Lei <ming.lei@redhat.com>2017-06-18 14:24:27 -0600
committerJens Axboe <axboe@kernel.dk>2017-06-18 14:24:27 -0600
commitf4560ffe8cec1361b1021d81aca6a4173f8e7c87 (patch)
tree957cae770ed234d2e03fef8a6e458296f011369e /block/blk-mq-sched.c
parentf660174e8bcdb2bf99129f9f7c86e5fc0e830f85 (diff)
downloadlinux-f4560ffe8cec1361b1021d81aca6a4173f8e7c87.tar.bz2
blk-mq: use QUEUE_FLAG_QUIESCED to quiesce queue
It is required that no dispatch can happen any more once blk_mq_quiesce_queue() returns, and we don't have such requirement on APIs of stopping queue. But blk_mq_quiesce_queue() still may not block/drain dispatch in the the case of BLK_MQ_S_START_ON_RUN, so use the new introduced flag of QUEUE_FLAG_QUIESCED and evaluate it inside RCU read-side critical sections for fixing this issue. Also blk_mq_quiesce_queue() is implemented via stopping queue, which limits its uses, and easy to cause race, because any queue restart in other paths may break blk_mq_quiesce_queue(). With the introduced flag of QUEUE_FLAG_QUIESCED, we don't need to depend on stopping queue for quiescing any more. Signed-off-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Bart Van Assche <Bart.VanAssche@sandisk.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq-sched.c')
-rw-r--r--block/blk-mq-sched.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index 254d1c164567..9f025289da63 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -58,7 +58,8 @@ void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx)
bool did_work = false;
LIST_HEAD(rq_list);
- if (unlikely(blk_mq_hctx_stopped(hctx)))
+ /* RCU or SRCU read lock is needed before checking quiesced flag */
+ if (unlikely(blk_mq_hctx_stopped(hctx) || blk_queue_quiesced(q)))
return;
hctx->run++;