Commit 5e081591 authored by Tao Ma's avatar Tao Ma Committed by Jens Axboe

block: warn if tag is greater than real_max_depth.

In case tag depth is reduced, it is max_depth not real_max_depth.
So we should allow a request with tag >= max_depth, but for a
tag >= real_max_depth, there really should be some problem.
Signed-off-by: default avatarTao Ma <>
Signed-off-by: default avatarJens Axboe <>
parent 83157223
......@@ -286,12 +286,14 @@ void blk_queue_end_tag(struct request_queue *q, struct request *rq)
BUG_ON(tag == -1);
if (unlikely(tag >= bqt->real_max_depth))
if (unlikely(tag >= bqt->max_depth)) {
* This can happen after tag depth has been reduced.
* FIXME: how about a warning or info message here?
* But tag shouldn't be larger than real_max_depth.
WARN_ON(tag >= bqt->real_max_depth);
rq->cmd_flags &= ~REQ_QUEUED;
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