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-mq.c b/block/blk-mq.c
index a868990..f5c7dbc 100644 (file)
--- 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 b664aa6..bd365a9 100644 (file)
--- 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);
 }