Commit b48fda09 authored Jan 26, 2017 by Jens Axboe

blk-mq-sched: check for successful allocation before assigning tag



We don't trigger this from the normal IO path, since we always use
blocking allocations from there. But Bart saw it testing multipath
dm, since that is a heavy user of atomic request allocations in
the map and clone path.

Reported-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

parent 5a797e00

block/blk-mq-sched.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -134,6 +134,7 @@ struct request blk_mq_sched_get_request(struct request_queue q,
		rq = __blk_mq_alloc_request(data, op);
		} else {
		rq = __blk_mq_alloc_request(data, op);
		if (rq)
		data->hctx->tags->rqs[rq->tag] = rq;
		}

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