From 2b5bbe3b8bee8b38bdc27dd9c0270829b6eb7eeb Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Thu, 24 Sep 2009 09:59:17 -0600 Subject: [PATCH] virtio_net: skb_orphan() and nf_reset() in xmit path. The complex transmit free logic was introduced to avoid hangs on removing the ip_conntrack module and also because drivers aren't generally supposed to keep stale skbs for unbounded times. After some debate, it was decided that while doing skb_orphan() generally is a rat's nest, we can do it in this driver. Following patches take advantage of this. Signed-off-by: Rusty Russell --- drivers/net/virtio_net.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 5c498d2b043f..dc4c68718976 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -528,8 +528,12 @@ static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb) num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; err = vi->svq->vq_ops->add_buf(vi->svq, sg, num, 0, skb); - if (err >= 0 && !vi->free_in_tasklet) + if (err >= 0 && !vi->free_in_tasklet) { + /* Don't wait up for transmitted skbs to be freed. */ + skb_orphan(skb); + nf_reset(skb); mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10)); + } return err; } -- 2.39.5