AuxXxilium/linux_dsm_epyc7002
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Merge branch 'for-linus' of git://git.kernel.dk/linux-block

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Pull virtio_blk fix from Jens Axboe:
 "There's a start/stop queue race in virtio_blk, which causes stalls and
  erratic behaviour for some.  I've had this queued up for 3.16 for a
  while, but I think we should push it into the current series as well.

  So I cherry picked the commit and added a stable marker as well, so it
  can propagate down"

* 'for-linus' of git://git.kernel.dk/linux-block:
  virtio_blk: fix race between start and stop queue
This commit is contained in:
Linus Torvalds 2014-05-27 15:59:34 -07:00
commit cd79bde29f
1 changed files with 2 additions and 2 deletions
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4
drivers/block/virtio_blk.c
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@ -144,11 +144,11 @@ static void virtblk_done(struct virtqueue *vq)
if (unlikely(virtqueue_is_broken(vq)))
break;
} while (!virtqueue_enable_cb(vq));
spin_unlock_irqrestore(&vblk->vq_lock, flags);
/* In case queue is stopped waiting for more buffers. */
if (req_done)
blk_mq_start_stopped_hw_queues(vblk->disk->queue);
spin_unlock_irqrestore(&vblk->vq_lock, flags);
}
static int virtio_queue_rq(struct blk_mq_hw_ctx *hctx, struct request *req)
@ -202,8 +202,8 @@ static int virtio_queue_rq(struct blk_mq_hw_ctx *hctx, struct request *req)
err = __virtblk_add_req(vblk->vq, vbr, vbr->sg, num);
if (err) {
virtqueue_kick(vblk->vq);
spin_unlock_irqrestore(&vblk->vq_lock, flags);
blk_mq_stop_hw_queue(hctx);
spin_unlock_irqrestore(&vblk->vq_lock, flags);
/* Out of mem doesn't actually happen, since we fall back
* to direct descriptors */
if (err == -ENOMEM || err == -ENOSPC)