From 5e08159197b5b98a6648a172008de23f420e6c11 Mon Sep 17 00:00:00 2001 From: Tao Ma Date: Tue, 25 Oct 2011 10:20:05 +0200 Subject: [PATCH] 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 Signed-off-by: Jens Axboe --- block/blk-tag.c | 6 ++++-- 1 file 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; -- 2.39.2