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Subject[PATCH 3/6] virtio_balloon: don't crash if virtqueue is broken.
Date
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>
---
drivers/virtio/virtio_balloon.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 5c4a95b516cf..fc1fb27dca49 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);
}

@@ -338,7 +336,7 @@ 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)
--
1.8.3.2


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