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blk-mq: update hardware and software queues for sleeping alloc

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If we end up sleeping due to running out of requests, we should
update the hardware and software queues in the map ctx structure.
Otherwise we could end up having rq->mq_ctx point to the pre-sleep
context, and risk corrupting ctx->rq_list since we'll be
grabbing the wrong lock when inserting the request.

Reported-by: Dave Jones <davej@codemonkey.org.uk>
Reported-by: Chris Mason <clm@fb.com>
Tested-by: Chris Mason <clm@fb.com>
Fixes: 63581af3f3 ("blk-mq: remove non-blocking pass in blk_mq_map_request")
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jens Axboe 2016-10-27 09:49:19 -06:00
parent ff26956875
commit 7dd2fb6877
1 changed files with 3 additions and 3 deletions
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6
block/blk-mq.c
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@ -1217,9 +1217,9 @@ static struct request *blk_mq_map_request(struct request_queue *q,
blk_mq_set_alloc_data(&alloc_data, q, 0, ctx, hctx);
rq = __blk_mq_alloc_request(&alloc_data, op, op_flags);
hctx->queued++;
data->hctx = hctx;
data->ctx = ctx;
data->hctx = alloc_data.hctx;
data->ctx = alloc_data.ctx;
data->hctx->queued++;
return rq;
}