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

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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>
This commit is contained in:
Jens Axboe 2017-01-26 14:52:20 -07:00
parent 5a797e00dc
commit b48fda0976
1 changed files with 2 additions and 1 deletions
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3
block/blk-mq-sched.c
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@ -134,7 +134,8 @@ 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);
data->hctx->tags->rqs[rq->tag] = rq;
if (rq)
data->hctx->tags->rqs[rq->tag] = rq;
}
if (rq) {