diff options
Diffstat (limited to 'block/blk-core.c')
| -rw-r--r-- | block/blk-core.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index 3c923a7aeb56..ce7fbf8d85a6 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -361,9 +361,10 @@ EXPORT_SYMBOL(blk_put_queue); */ void blk_drain_queue(struct request_queue *q, bool drain_all) { + int i; + while (true) { bool drain = false; - int i; spin_lock_irq(q->queue_lock); @@ -408,6 +409,18 @@ void blk_drain_queue(struct request_queue *q, bool drain_all) break; msleep(10); } + + /* + * With queue marked dead, any woken up waiter will fail the + * allocation path, so the wakeup chaining is lost and we're + * left with hung waiters. We need to wake up those waiters. + */ + if (q->request_fn) { + spin_lock_irq(q->queue_lock); + for (i = 0; i < ARRAY_SIZE(q->rq.wait); i++) + wake_up_all(&q->rq.wait[i]); + spin_unlock_irq(q->queue_lock); + } } /** |