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block: do not put mq context in blk_mq_alloc_request_hctx 

In blk_mq_alloc_request_hctx, blk_mq_sched_get_request doesn't
get sw context so we don't need to put the context with
blk_mq_put_ctx. Unless, we will see preempt counter underflow.

Cc: Omar Sandoval <osandov@fb.com>
Signed-off-by: Minchan Kim <minchan@kernel.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Minchan Kim 2017-03-30 14:20:45 +09:00 committed by Jens Axboe
parent 3e8a7069b9
commit 3e06eb3dac
1 changed files with 0 additions and 1 deletions
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block/blk-mq.c
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@ -324,7 +324,6 @@ struct request *blk_mq_alloc_request_hctx(struct request_queue *q, int rw,
rq = blk_mq_sched_get_request(q, NULL, rw, &alloc_data);
blk_mq_put_ctx(alloc_data.ctx);
blk_queue_exit(q);
if (!rq)