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authorBart Van Assche <bart.vanassche@wdc.com>2018-03-07 17:10:05 -0800
committerJens Axboe <axboe@kernel.dk>2018-03-08 14:13:48 -0700
commit7dfdbc7367f6f789715cab2cb484b78ab45e9f3e (patch)
tree12bb8fc5fe749d47d9948f2a2b502a021fe9dd1d
parent8814ce8a0f680599a837af18aefdec774e5c7b97 (diff)
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block: Protect queue flag changes with the queue lock
Since the queue flags may be changed concurrently from multiple contexts after a queue becomes visible in sysfs, make these changes safe by protecting these with the queue lock. Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Ming Lei <ming.lei@redhat.com> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--block/blk-mq.c2
-rw-r--r--block/blk-stat.c6
2 files changed, 4 insertions, 4 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index a86899022683..f5c7dbcb954f 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2997,7 +2997,7 @@ EXPORT_SYMBOL_GPL(blk_mq_update_nr_hw_queues);
static bool blk_poll_stats_enable(struct request_queue *q)
{
if (test_bit(QUEUE_FLAG_POLL_STATS, &q->queue_flags) ||
- test_and_set_bit(QUEUE_FLAG_POLL_STATS, &q->queue_flags))
+ blk_queue_flag_test_and_set(QUEUE_FLAG_POLL_STATS, q))
return true;
blk_stat_add_callback(q, q->poll_cb);
return false;
diff --git a/block/blk-stat.c b/block/blk-stat.c
index b664aa6df725..bd365a95fcf8 100644
--- a/block/blk-stat.c
+++ b/block/blk-stat.c
@@ -152,7 +152,7 @@ void blk_stat_add_callback(struct request_queue *q,
spin_lock(&q->stats->lock);
list_add_tail_rcu(&cb->list, &q->stats->callbacks);
- queue_flag_set(QUEUE_FLAG_STATS, q);
+ blk_queue_flag_set(QUEUE_FLAG_STATS, q);
spin_unlock(&q->stats->lock);
}
EXPORT_SYMBOL_GPL(blk_stat_add_callback);
@@ -163,7 +163,7 @@ void blk_stat_remove_callback(struct request_queue *q,
spin_lock(&q->stats->lock);
list_del_rcu(&cb->list);
if (list_empty(&q->stats->callbacks) && !q->stats->enable_accounting)
- queue_flag_clear(QUEUE_FLAG_STATS, q);
+ blk_queue_flag_clear(QUEUE_FLAG_STATS, q);
spin_unlock(&q->stats->lock);
del_timer_sync(&cb->timer);
@@ -191,7 +191,7 @@ void blk_stat_enable_accounting(struct request_queue *q)
{
spin_lock(&q->stats->lock);
q->stats->enable_accounting = true;
- queue_flag_set(QUEUE_FLAG_STATS, q);
+ blk_queue_flag_set(QUEUE_FLAG_STATS, q);
spin_unlock(&q->stats->lock);
}