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>
diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 36e7859..25ebe8e 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -108,8 +108,7 @@
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 @@
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 @@
/*
* 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)