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authorChristoph Hellwig <hch@lst.de>2015-10-30 20:57:30 +0800
committerJens Axboe <axboe@fb.com>2015-12-22 09:38:16 -0700
commit287922eb0b186e2a5bf54fdd04b734c25c90035c (patch)
treebf7e8976139ac3eacfaab6ace9d1807088463140 /block/blk-timeout.c
parent8c0b39155048d5a24f25c6c60aa83729927b04cd (diff)
downloadlinux-287922eb0b186e2a5bf54fdd04b734c25c90035c.tar.gz
block: defer timeouts to a workqueue
Timer context is not very useful for drivers to perform any meaningful abort action from. So instead of calling the driver from this useless context defer it to a workqueue as soon as possible. Note that while a delayed_work item would seem the right thing here I didn't dare to use it due to the magic in blk_add_timer that pokes deep into timer internals. But maybe this encourages Tejun to add a sensible API for that to the workqueue API and we'll all be fine in the end :) Contains a major update from Keith Bush: "This patch removes synchronizing the timeout work so that the timer can start a freeze on its own queue. The timer enters the queue, so timer context can only start a freeze, but not wait for frozen." Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-timeout.c')
-rw-r--r--block/blk-timeout.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/block/blk-timeout.c b/block/blk-timeout.c
index 3610af561748..dd4fdfbcb3dd 100644
--- a/block/blk-timeout.c
+++ b/block/blk-timeout.c
@@ -127,13 +127,16 @@ static void blk_rq_check_expired(struct request *rq, unsigned long *next_timeout
}
}
-void blk_rq_timed_out_timer(unsigned long data)
+void blk_timeout_work(struct work_struct *work)
{
- struct request_queue *q = (struct request_queue *) data;
+ struct request_queue *q =
+ container_of(work, struct request_queue, timeout_work);
unsigned long flags, next = 0;
struct request *rq, *tmp;
int next_set = 0;
+ if (blk_queue_enter(q, true))
+ return;
spin_lock_irqsave(q->queue_lock, flags);
list_for_each_entry_safe(rq, tmp, &q->timeout_list, timeout_list)
@@ -143,6 +146,7 @@ void blk_rq_timed_out_timer(unsigned long data)
mod_timer(&q->timeout, round_jiffies_up(next));
spin_unlock_irqrestore(q->queue_lock, flags);
+ blk_queue_exit(q);
}
/**