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blk-mq: Fix NULL pointer updating nr_requests

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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 <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Keith Busch
2016-02-18 14:56:35 -07:00
committed by Jens Axboe
parent 6684167216
commit e9137d4b93
1 changed files with 2 additions and 0 deletions
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block/blk-mq.c
+2
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@@ -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;