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| author | Tao Ma <boyu.mt@taobao.com> | 2011-10-25 10:20:05 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2011-10-25 10:20:05 +0200 |
| commit | 5e08159197b5b98a6648a172008de23f420e6c11 (patch) | |
| tree | 7d9d9b275f8b62fa5069012df293e0af364bce86 /block | |
| parent | 83157223defe3be490cfea048e83451b6f254216 (diff) | |
| download | lwn-5e08159197b5b98a6648a172008de23f420e6c11.tar.gz lwn-5e08159197b5b98a6648a172008de23f420e6c11.zip | |
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: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-tag.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/block/blk-tag.c b/block/blk-tag.c index ece65fc4c79b..e74d6d13838f 100644 --- a/block/blk-tag.c +++ b/block/blk-tag.c @@ -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); return; + } list_del_init(&rq->queuelist); rq->cmd_flags &= ~REQ_QUEUED; |