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authorShaohua Li <shli@fusionio.com>2013-11-19 18:57:24 -0700
committerJens Axboe <axboe@kernel.dk>2013-11-19 19:00:45 -0700
commitf02b9ac35a47dff745c7637fbc095f01cc03646e (patch)
tree3615c099998adb4d8b65681acb16d9b060b1ee89 /drivers/block/virtio_blk.c
parent94eddfbeaafa3e8040a2c47d370dea0e58e76941 (diff)
downloadlinux-f02b9ac35a47dff745c7637fbc095f01cc03646e.tar.bz2
virtio-blk: virtqueue_kick() must be ordered with other virtqueue operations
It isn't safe to call it without holding the vblk->vq_lock. Reported-by: Dave Chinner <david@fromorbit.com> Signed-off-by: Shaohua Li <shli@fusionio.com> Fixed another condition of virtqueue_kick() not holding the lock. Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block/virtio_blk.c')
-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;
}