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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2012-03-14 08:53:34 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-03-16 02:01:17 -0700 |
| commit | bb6d5e76fb4fba9aa36726db41404512f3286c0f (patch) | |
| tree | 58858ab2c09fe9179dcf4c26da83bbd9c3783211 | |
| parent | 7bdd402706cf26bfef9050dfee3f229b7f33ee4f (diff) | |
| download | op-kernel-dev-bb6d5e76fb4fba9aa36726db41404512f3286c0f.zip op-kernel-dev-bb6d5e76fb4fba9aa36726db41404512f3286c0f.tar.gz | |
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>
| -rw-r--r-- | drivers/net/hyperv/netvsc_drv.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c index bf01841..610860f 100644 --- a/drivers/net/hyperv/netvsc_drv.c +++ b/drivers/net/hyperv/netvsc_drv.c @@ -166,7 +166,7 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net) dev_kfree_skb(skb); net->stats.tx_dropped++; - return NETDEV_TX_BUSY; + return NETDEV_TX_OK; } packet->extension = (void *)(unsigned long)packet + @@ -226,7 +226,7 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net) dev_kfree_skb_any(skb); } - return ret ? NETDEV_TX_BUSY : NETDEV_TX_OK; + return NETDEV_TX_OK; } /* |
