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authorLinus Torvalds <torvalds@linux-foundation.org>2013-11-20 13:06:20 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-11-20 13:06:20 -0800
commit5a1efc6e68a095917277459091fafba6a6baef17 (patch)
tree9f3d9b14893689cee1b7918e51b15ca135f6563a /drivers
parent6d6e352c80f22c446d933ca8103e02bac1f09129 (diff)
parent01b983c9fcfeea5774ca2df2e167b68c3c299278 (diff)
downloadlinux-5a1efc6e68a095917277459091fafba6a6baef17.tar.bz2
Merge branch 'for-linus' of git://git.kernel.dk/linux-block
Pull block IO fixes from Jens Axboe: "Normally I'd defer my initial for-linus pull request until after the merge window, but a race was uncovered in the virtio-blk conversion to blk-mq that could cause hangs. So here's a small collection of fixes for you to pull: - The fix for the virtio-blk IO hang reported by Dave Chinner, from Shaohua and myself. - Add the Insert blktrace event for blk-mq. This makes 'btt' happy when it is doing it's state transition analysis. - Ensure that blk-mq has disk/partition stats enabled by default, instead of making it opt-in. - A fix for __bio_add_page() and large sector counts" * 'for-linus' of git://git.kernel.dk/linux-block: blk-mq: add blktrace insert event trace virtio-blk: virtqueue_kick() must be ordered with other virtqueue operations blk-mq: ensure that we set REQ_IO_STAT so diskstats work bio: fix argument of __bio_add_page() for max_sectors > 0xffff
Diffstat (limited to 'drivers')
-rw-r--r--drivers/block/virtio_blk.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 588479d58f52..6a680d4de7f1 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -199,15 +199,16 @@ static int virtio_queue_rq(struct blk_mq_hw_ctx *hctx, struct request *req)
spin_lock_irqsave(&vblk->vq_lock, flags);
if (__virtblk_add_req(vblk->vq, vbr, vbr->sg, num) < 0) {
+ virtqueue_kick(vblk->vq);
spin_unlock_irqrestore(&vblk->vq_lock, flags);
blk_mq_stop_hw_queue(hctx);
- virtqueue_kick(vblk->vq);
return BLK_MQ_RQ_QUEUE_BUSY;
}
- spin_unlock_irqrestore(&vblk->vq_lock, flags);
if (last)
virtqueue_kick(vblk->vq);
+
+ spin_unlock_irqrestore(&vblk->vq_lock, flags);
return BLK_MQ_RQ_QUEUE_OK;
}