diff options
| author | Jani Nikula <jani.nikula@intel.com> | 2018-11-02 09:00:55 +0200 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2018-11-02 09:01:28 +0200 |
| commit | 7a085c3aad94cce7e11031c6800e41668418ae4c (patch) | |
| tree | b3474f8bd622f87ad39227057f9de60959c8bd95 /block/blk-mq-tag.c | |
| parent | 18cde299df33ff73908f7e5dcebf321fb79ed36c (diff) | |
| parent | f9885ef875e9160454392f85159163674159c51f (diff) | |
| download | linux-stable-7a085c3aad94cce7e11031c6800e41668418ae4c.tar.gz linux-stable-7a085c3aad94cce7e11031c6800e41668418ae4c.tar.bz2 linux-stable-7a085c3aad94cce7e11031c6800e41668418ae4c.zip | |
Merge drm/drm-next into drm-intel-next-queued
Although there's nothing crucial missing, it's been a long time since
the last backmerge. Catch up with drm-next.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Diffstat (limited to 'block/blk-mq-tag.c')
| -rw-r--r-- | block/blk-mq-tag.c | 13 |
1 files changed, 4 insertions, 9 deletions
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c index 94e1ed667b6e..41317c50a446 100644 --- a/block/blk-mq-tag.c +++ b/block/blk-mq-tag.c @@ -322,16 +322,11 @@ void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn, /* * __blk_mq_update_nr_hw_queues will update the nr_hw_queues and - * queue_hw_ctx after freeze the queue. So we could use q_usage_counter - * to avoid race with it. __blk_mq_update_nr_hw_queues will users - * synchronize_rcu to ensure all of the users go out of the critical - * section below and see zeroed q_usage_counter. + * queue_hw_ctx after freeze the queue, so we use q_usage_counter + * to avoid race with it. */ - rcu_read_lock(); - if (percpu_ref_is_zero(&q->q_usage_counter)) { - rcu_read_unlock(); + if (!percpu_ref_tryget(&q->q_usage_counter)) return; - } queue_for_each_hw_ctx(q, hctx, i) { struct blk_mq_tags *tags = hctx->tags; @@ -347,7 +342,7 @@ void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn, bt_for_each(hctx, &tags->breserved_tags, fn, priv, true); bt_for_each(hctx, &tags->bitmap_tags, fn, priv, false); } - rcu_read_unlock(); + blk_queue_exit(q); } static int bt_alloc(struct sbitmap_queue *bt, unsigned int depth, |