From 7dfdbc7367f6f789715cab2cb484b78ab45e9f3e Mon Sep 17 00:00:00 2001 From: Bart Van Assche Date: Wed, 7 Mar 2018 17:10:05 -0800 Subject: [PATCH] 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 Cc: Hannes Reinecke Cc: Ming Lei Reviewed-by: Martin K. Petersen Reviewed-by: Johannes Thumshirn Signed-off-by: Bart Van Assche Signed-off-by: Jens Axboe --- block/blk-mq.c | 2 +- block/blk-stat.c | 6 +++--- 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); } -- GitLab