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>
diff --git a/block/blk-stat.c b/block/blk-stat.c
index b664aa6..bd365a9 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);
}