virtio-rng: 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/char/hw_random/virtio-rng.c b/drivers/char/hw_random/virtio-rng.c
index c12398d..2ce0e22 100644
--- a/drivers/char/hw_random/virtio-rng.c
+++ b/drivers/char/hw_random/virtio-rng.c
@@ -47,8 +47,7 @@
sg_init_one(&sg, buf, size);
/* There should always be room for one buffer. */
- if (virtqueue_add_inbuf(vq, &sg, 1, buf, GFP_KERNEL) < 0)
- BUG();
+ virtqueue_add_inbuf(vq, &sg, 1, buf, GFP_KERNEL);
virtqueue_kick(vq);
}