diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-12-29 16:33:37 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-12-29 16:33:37 -0800 |
| commit | 1cac8e884fbea0b10ee5692cd97e456b58c34ce5 (patch) | |
| tree | ae6417c9015085e275caa84f755ee6f3a54d234e | |
| parent | b0365c8d0cb6e79eb5f21418ae61ab511f31b575 (diff) | |
| parent | f2b20d436534f22ccc3f5ad172499fcb013bb315 (diff) | |
Merge branch 'for-linus' of git://git.kernel.dk/linux-block
* 'for-linus' of git://git.kernel.dk/linux-block:
block: fix blk_queue_end_tag()
block: re-use existing 'reading' variable instead of checking direction again
block, cfq: fix empty queue crash caused by request merge
| -rw-r--r-- | block/blk-map.c | 2 | ||||
| -rw-r--r-- | block/blk-tag.c | 13 | ||||
| -rw-r--r-- | block/cfq-iosched.c | 12 |
3 files changed, 15 insertions, 12 deletions
diff --git a/block/blk-map.c b/block/blk-map.c index 164cd0059706..623e1cd4cffe 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -311,7 +311,7 @@ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf, if (IS_ERR(bio)) return PTR_ERR(bio); - if (rq_data_dir(rq) == WRITE) + if (!reading) bio->bi_rw |= REQ_WRITE; if (do_copy) diff --git a/block/blk-tag.c b/block/blk-tag.c index e74d6d13838f..4af6f5cc1167 100644 --- a/block/blk-tag.c +++ b/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; diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 4c12869fcf77..3548705b04e4 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -1655,6 +1655,8 @@ cfq_merged_requests(struct request_queue *q, struct request *rq, struct request *next) { struct cfq_queue *cfqq = RQ_CFQQ(rq); + struct cfq_data *cfqd = q->elevator->elevator_data; + /* * reposition in fifo if next is older than rq */ @@ -1669,6 +1671,16 @@ cfq_merged_requests(struct request_queue *q, struct request *rq, cfq_remove_request(next); cfq_blkiocg_update_io_merged_stats(&(RQ_CFQG(rq))->blkg, rq_data_dir(next), rq_is_sync(next)); + + cfqq = RQ_CFQQ(next); + /* + * all requests of this queue are merged to other queues, delete it + * from the service tree. If it's the active_queue, + * cfq_dispatch_requests() will choose to expire it or do idle + */ + if (cfq_cfqq_on_rr(cfqq) && RB_EMPTY_ROOT(&cfqq->sort_list) && + cfqq != cfqd->active_queue) + cfq_del_cfqq_rr(cfqd, cfqq); } static int cfq_allow_merge(struct request_queue *q, struct request *rq, |