net/hyperv: fix erroneous NETDEV_TX_BUSY use
A driver start_xmit() method cannot free skb and return NETDEV_TX_BUSY,
since caller is going to reuse freed skb.
This is mostly a revert of commit bf769375c
(staging: hv: fix the return
status of netvsc_start_xmit())
In fact netif_tx_stop_queue() / netif_stop_queue() is needed before
returning NETDEV_TX_BUSY or you can trigger a ksoftirqd fatal loop.
In case of memory allocation error, only safe way is to drop the packet
and return NETDEV_TX_OK
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
7bdd402706
commit
bb6d5e76fb
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@ -166,7 +166,7 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
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dev_kfree_skb(skb);
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net->stats.tx_dropped++;
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return NETDEV_TX_BUSY;
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return NETDEV_TX_OK;
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}
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packet->extension = (void *)(unsigned long)packet +
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@ -226,7 +226,7 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
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dev_kfree_skb_any(skb);
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}
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return ret ? NETDEV_TX_BUSY : NETDEV_TX_OK;
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return NETDEV_TX_OK;
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}
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/*
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