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 bf769375 (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: NEric 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: NHaiyang Zhang <haiyangz@microsoft.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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