virtio_net: avoid BUG_ON() with large packets when CONFIG_DEBUG_SG=y AFAICT only weird kvm setups and lguest traverse this code path now. Signed-off-by: Rusty Russell --- drivers/net/virtio_net.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -351,6 +351,9 @@ static int add_recvbuf_big(struct virtne char *p; int i, err, offset; + /* This is a waste of cycles, but satisfies CONFIG_DEBUG_SG. */ + sg_init_table(sg, ARRAY_SIZE(sg)); + /* page in sg[MAX_SKB_FRAGS + 1] is list tail */ for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { first = get_a_page(vi, gfp);