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| author | Rusty Russell <rusty@rustcorp.com.au> | 2014-03-13 11:23:40 +1030 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2014-03-13 11:27:56 +1030 |
| commit | 4951cc9083147015338f61a187e072daf02dfd4e (patch) | |
| tree | 600821ce6f9733fec02bac2b8d188f8a9d11a7b0 | |
| parent | 5261b85e586afe6ebe54e16e0a8acc32fc6d4902 (diff) | |
| download | linux-4951cc9083147015338f61a187e072daf02dfd4e.tar.gz linux-4951cc9083147015338f61a187e072daf02dfd4e.tar.bz2 linux-4951cc9083147015338f61a187e072daf02dfd4e.zip | |
virtio_balloon: don't crash if virtqueue is broken.
A bad implementation of virtio might cause us to mark the virtqueue
broken: we'll dev_err() in that case, and the device is useless, but
let's not BUG().
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| -rw-r--r-- | drivers/virtio/virtio_balloon.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c index 36e7859a31aa..25ebe8eecdb7 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -108,8 +108,7 @@ static void tell_host(struct virtio_balloon *vb, struct virtqueue *vq) sg_init_one(&sg, vb->pfns, sizeof(vb->pfns[0]) * vb->num_pfns); /* We should always be able to add one buffer to an empty queue. */ - if (virtqueue_add_outbuf(vq, &sg, 1, vb, GFP_KERNEL) < 0) - BUG(); + virtqueue_add_outbuf(vq, &sg, 1, vb, GFP_KERNEL); virtqueue_kick(vq); /* When host has read buffer, this completes via balloon_ack */ @@ -258,8 +257,7 @@ static void stats_handle_request(struct virtio_balloon *vb) if (!virtqueue_get_buf(vq, &len)) return; sg_init_one(&sg, vb->stats, sizeof(vb->stats)); - if (virtqueue_add_outbuf(vq, &sg, 1, vb, GFP_KERNEL) < 0) - BUG(); + virtqueue_add_outbuf(vq, &sg, 1, vb, GFP_KERNEL); virtqueue_kick(vq); } @@ -344,7 +342,7 @@ static int init_vqs(struct virtio_balloon *vb) /* * Prime this virtqueue with one buffer so the hypervisor can - * use it to signal us later. + * use it to signal us later (it can't be broken yet!). */ sg_init_one(&sg, vb->stats, sizeof vb->stats); if (virtqueue_add_outbuf(vb->stats_vq, &sg, 1, vb, GFP_KERNEL) |