The patch titled Subject: block: fix blk_queue_end_tag() has been added to the -mm tree. Its filename is block-fix-blk_queue_end_tag.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Dan Williams <dan.j.williams@xxxxxxxxx> Subject: block: fix blk_queue_end_tag() Commit 5e081591 "block: warn if tag is greater than real_max_depth" cleaned up blk_queue_end_tag() to warn when the tag is truly invalid (greater than real_max_depth). However, it changed behavior in the tag < max_depth case to not end the request. Leading to triggering of BUG_ON(blk_queued_rq(rq)) in the request completion path: http://marc.info/?l=linux-kernel&m=132204370518629&w=2 In order to allow blk_queue_resize_tags() to shrink the tag space blk_queue_end_tag() must always complete tags with a value less than real_max_depth regardless of the current max_depth. The comment about "handling the shrink case" seems to be what prompted changes in this space, so remove it and BUG on all invalid tags (made even simpler by Matthew's suggestion to use an unsigned compare). Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx> Cc: Tao Ma <boyu.mt@xxxxxxxxxx> Cc: Matthew Wilcox <matthew@xxxxxx> Reported-by: Meelis Roos <mroos@xxxxx> Reported-by: Ed Nadolski <edmund.nadolski@xxxxxxxxx> Cc: Jens Axboe <axboe@xxxxxxxxx> Cc: Tejun Heo <tj@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- block/blk-tag.c | 13 ++----------- 1 file changed, 2 insertions(+), 11 deletions(-) diff -puN block/blk-tag.c~block-fix-blk_queue_end_tag block/blk-tag.c --- a/block/blk-tag.c~block-fix-blk_queue_end_tag +++ a/block/blk-tag.c @@ -282,18 +282,9 @@ EXPORT_SYMBOL(blk_queue_resize_tags); void blk_queue_end_tag(struct request_queue *q, struct request *rq) { struct blk_queue_tag *bqt = q->queue_tags; - int tag = rq->tag; + unsigned tag = rq->tag; /* negative tags invalid */ - BUG_ON(tag == -1); - - if (unlikely(tag >= bqt->max_depth)) { - /* - * This can happen after tag depth has been reduced. - * But tag shouldn't be larger than real_max_depth. - */ - WARN_ON(tag >= bqt->real_max_depth); - return; - } + BUG_ON(tag >= bqt->real_max_depth); list_del_init(&rq->queuelist); rq->cmd_flags &= ~REQ_QUEUED; _ Subject: Subject: block: fix blk_queue_end_tag() Patches currently in -mm which might be from dan.j.williams@xxxxxxxxx are block-fix-blk_queue_end_tag.patch linux-next.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html