blk-mq: idle all hardware contexts before freeing a queue

Without this we can leak the active_queues reference if a command is
freed while it is considered active.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 9bc075335d065ebb59fc5c9b40284602dd98465c..62082c5daae7cbafbfdb294fdee70c38a5c90257 100644 (file)
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1844,6 +1844,7 @@ void blk_mq_free_queue(struct request_queue *q)
        blk_mq_del_queue_tag_set(q);
 
        queue_for_each_hw_ctx(q, hctx, i) {
+               blk_mq_tag_idle(hctx);
                kfree(hctx->ctxs);
                blk_mq_unregister_cpu_notifier(&hctx->cpu_notifier);
                if (q->mq_ops->exit_hctx)