blk-mq: Fix NULL pointer updating nr_requests

A h/w context's tags are freed if it was not assigned a CPU. Check if the context has tags before updating the depth. Signed-off-by: Keith Busch <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
mrcsosa · Mar 3, 2016 · e9137d4 · e9137d4
1 parent 6684167
commit e9137d4
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/block/blk-mq.c b/block/blk-mq.c
@@ -2336,6 +2336,8 @@ int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr)
 
 	ret = 0;
 	queue_for_each_hw_ctx(q, hctx, i) {
+		if (!hctx->tags)
+			continue;
 		ret = blk_mq_tag_update_depth(hctx->tags, nr);
 		if (ret)
 			break;