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| author | Mike Snitzer <snitzer@redhat.com> | 2016-02-20 05:38:47 (GMT) |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2016-02-23 03:33:09 (GMT) |
| commit | 818c5f3bef750eb5998b468f84391e4d656b97ed (patch) | |
| tree | 870376e3cae6542564325980b7c0d11b1f2b0345 /drivers/md/dm.c | |
| parent | 1c357a1e86a4227a6b6059f2de118ae47659cebc (diff) | |
| download | linux-818c5f3bef750eb5998b468f84391e4d656b97ed.tar.xz | |
dm: fix a couple locking issues with use of block interfaces
old_stop_queue() was checking blk_queue_stopped() without holding the
q->queue_lock.
dm_requeue_original_request() needed to check blk_queue_stopped(), with
q->queue_lock held, before calling blk_mq_kick_requeue_list(). And a
side-effect of that change is start_queue() must also call
blk_mq_kick_requeue_list().
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm.c')
| -rw-r--r-- | drivers/md/dm.c | 28 |
1 files changed, 21 insertions, 7 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index e903595..8a62e43 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1215,6 +1215,18 @@ static void old_requeue_request(struct request *rq) spin_unlock_irqrestore(q->queue_lock, flags); } +static void dm_mq_requeue_request(struct request *rq) +{ + struct request_queue *q = rq->q; + unsigned long flags; + + blk_mq_requeue_request(rq); + spin_lock_irqsave(q->queue_lock, flags); + if (!blk_queue_stopped(q)) + blk_mq_kick_requeue_list(q); + spin_unlock_irqrestore(q->queue_lock, flags); +} + static void dm_requeue_original_request(struct mapped_device *md, struct request *rq) { @@ -1225,10 +1237,8 @@ static void dm_requeue_original_request(struct mapped_device *md, rq_end_stats(md, rq); if (!rq->q->mq_ops) old_requeue_request(rq); - else { - blk_mq_requeue_request(rq); - blk_mq_kick_requeue_list(rq->q); - } + else + dm_mq_requeue_request(rq); rq_completed(md, rw, false); } @@ -1237,10 +1247,12 @@ static void old_stop_queue(struct request_queue *q) { unsigned long flags; - if (blk_queue_stopped(q)) + spin_lock_irqsave(q->queue_lock, flags); + if (blk_queue_stopped(q)) { + spin_unlock_irqrestore(q->queue_lock, flags); return; + } - spin_lock_irqsave(q->queue_lock, flags); blk_stop_queue(q); spin_unlock_irqrestore(q->queue_lock, flags); } @@ -1267,8 +1279,10 @@ static void start_queue(struct request_queue *q) { if (!q->mq_ops) old_start_queue(q); - else + else { blk_mq_start_stopped_hw_queues(q, true); + blk_mq_kick_requeue_list(q); + } } static void dm_done(struct request *clone, int error, bool mapped) |