diff options
| -rw-r--r-- | block/blk-core.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index 6fa82291210e..ccf9a7683a3c 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -869,7 +869,16 @@ int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags) */ blk_flush_plug(current->plug, false); - if (bio_queue_enter(bio)) + /* + * We need to be able to enter a frozen queue, similar to how + * timeouts also need to do that. If that is blocked, then we can + * have pending IO when a queue freeze is started, and then the + * wait for the freeze to finish will wait for polled requests to + * timeout as the poller is preventer from entering the queue and + * completing them. As long as we prevent new IO from being queued, + * that should be all that matters. + */ + if (!percpu_ref_tryget(&q->q_usage_counter)) return 0; if (queue_is_mq(q)) { ret = blk_mq_poll(q, cookie, iob, flags); |