diff options
Diffstat (limited to 'block/blk-core.c')
| -rw-r--r-- | block/blk-core.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index 7b66f76f9cff..43b7d06ced69 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -500,6 +500,13 @@ void blk_set_queue_dying(struct request_queue *q) queue_flag_set(QUEUE_FLAG_DYING, q); spin_unlock_irq(q->queue_lock); + /* + * When queue DYING flag is set, we need to block new req + * entering queue, so we call blk_freeze_queue_start() to + * prevent I/O from crossing blk_queue_enter(). + */ + blk_freeze_queue_start(q); + if (q->mq_ops) blk_mq_wake_waiters(q); else { @@ -672,9 +679,9 @@ int blk_queue_enter(struct request_queue *q, bool nowait) /* * read pair of barrier in blk_freeze_queue_start(), * we need to order reading __PERCPU_REF_DEAD flag of - * .q_usage_counter and reading .mq_freeze_depth, - * otherwise the following wait may never return if the - * two reads are reordered. + * .q_usage_counter and reading .mq_freeze_depth or + * queue dying flag, otherwise the following wait may + * never return if the two reads are reordered. */ smp_rmb(); |