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

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;
}