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blk-mq: don't call into depth limiting for reserved tags

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It's not useful, they are internal and/or error handling recovery
commands.

Acked-by: Paolo Valente <paolo.valente@linaro.org>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2018-05-09 13:28:50 -06:00
parent 18e5a57d79
commit 17a5119932
1 changed files with 4 additions and 2 deletions
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6
block/blk-mq.c
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@ -360,9 +360,11 @@ static struct request *blk_mq_get_request(struct request_queue *q,
/*
* Flush requests are special and go directly to the
* dispatch list.
* dispatch list. Don't include reserved tags in the
* limiting, as it isn't useful.
*/
if (!op_is_flush(op) && e->type->ops.mq.limit_depth)
if (!op_is_flush(op) && e->type->ops.mq.limit_depth &&
!(data->flags & BLK_MQ_REQ_RESERVED))
e->type->ops.mq.limit_depth(op, data);
}