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tun: report orphan frags errors to zero copy callback

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When tun transmits a zero copy skb, it orphans the frags
which might need to allocate extra memory, in atomic context.
If that fails, notify ubufs callback before freeing the skb
as a hint that device should disable zerocopy mode.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael S. Tsirkin 2012-11-01 09:16:32 +00:00 committed by David S. Miller
parent 25121173f7
commit 149d36f718
1 changed files with 1 additions and 0 deletions
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drivers/net/tun.c
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@ -728,6 +728,7 @@ static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
drop:
dev->stats.tx_dropped++;
skb_tx_error(skb);
kfree_skb(skb);
rcu_read_unlock();
return NETDEV_TX_OK;