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authorTejun Heo <tj@kernel.org>2014-12-07 19:55:49 +0000
committerWilly Tarreau <w@1wt.eu>2014-12-13 15:16:19 +0100
commit3b77fc36cefaacba19a48db43ab3b8dc57cbfc1b (patch)
treeaa1f5ac019439a7fba2b995420a14f9fdfcd1d02 /block
parentd49465185ef41bea43666e349b72b6d1e1fbd296 (diff)
block: add missing blk_queue_dead() checks
commit 8ba61435d73f2274e12d4d823fde06735e8f6a54 upstream. blk_insert_cloned_request(), blk_execute_rq_nowait() and blk_flush_plug_list() either didn't check whether the queue was dead or did it without holding queue_lock. Update them so that dead state is checked while holding queue_lock. AFAICS, this plugs all holes (requeue doesn't matter as the request is transitioning atomically from in_flight to queued). Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk> [bwh: Backported to 2.6.32: - Drop inapplicable changes to queue_unplugged() and blk_flush_plug_list() - We don't have blk_queue_dead() so open-code it - Adjust context] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Willy Tarreau <w@1wt.eu>
Diffstat (limited to 'block')
-rw-r--r--block/blk-core.c4
-rw-r--r--block/blk-exec.c6
2 files changed, 8 insertions, 2 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 4058f4625f1a..ad566e252935 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1651,6 +1651,10 @@ int blk_insert_cloned_request(struct request_queue *q, struct request *rq)
#endif
spin_lock_irqsave(q->queue_lock, flags);
+ if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags))) {
+ spin_unlock_irqrestore(q->queue_lock, flags);
+ return -ENODEV;
+ }
/*
* Submitting request must be dequeued before calling this function
diff --git a/block/blk-exec.c b/block/blk-exec.c
index 85bd7b445d86..ae0f2c7bcfc9 100644
--- a/block/blk-exec.c
+++ b/block/blk-exec.c
@@ -50,7 +50,11 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
{
int where = at_head ? ELEVATOR_INSERT_FRONT : ELEVATOR_INSERT_BACK;
+ WARN_ON(irqs_disabled());
+ spin_lock_irq(q->queue_lock);
+
if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags))) {
+ spin_unlock_irq(q->queue_lock);
rq->errors = -ENXIO;
if (rq->end_io)
rq->end_io(rq, rq->errors);
@@ -59,8 +63,6 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
rq->rq_disk = bd_disk;
rq->end_io = done;
- WARN_ON(irqs_disabled());
- spin_lock_irq(q->queue_lock);
__elv_add_request(q, rq, where, 1);
__generic_unplug_device(q);
/* the queue is stopped so it won't be plugged+unplugged */