[v2] usbnet: fix oops in usbnet_start_xmit

This patch fixes the bug added in commit v3.1-rc7-1055-gf9b491e
SKB can be NULL at this point, at least for cdc-ncm.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
---
 drivers/net/usb/usbnet.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)


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On Mon, Nov 07, 2011 at 06:54:58PM +0300, Konstantin Khlebnikov wrote:
> This patch fixes the bug added in commit v3.1-rc7-1055-gf9b491e
> SKB can be NULL at this point, at least for cdc-ncm.
> 
> Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>

Acked-by: Richard Cochran <richardcochran@gmail.com>

> ---
>  drivers/net/usb/usbnet.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
> index 7d60821..fae0fbd 100644
> --- a/drivers/net/usb/usbnet.c
> +++ b/drivers/net/usb/usbnet.c
> @@ -1057,7 +1057,8 @@ netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
>  	unsigned long		flags;
>  	int retval;
>  
> -	skb_tx_timestamp(skb);
> +	if (skb)
> +		skb_tx_timestamp(skb);
>  
>  	// some devices want funky USB-level framing, for
>  	// win32 driver (usually) and/or hardware quirks
> 
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From: Richard Cochran <richardcochran@gmail.com>
Date: Mon, 7 Nov 2011 18:39:19 +0100

> On Mon, Nov 07, 2011 at 06:54:58PM +0300, Konstantin Khlebnikov wrote:
>> This patch fixes the bug added in commit v3.1-rc7-1055-gf9b491e
>> SKB can be NULL at this point, at least for cdc-ncm.
>> 
>> Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
> 
> Acked-by: Richard Cochran <richardcochran@gmail.com>

Applied, but the overall logic in the usbnet transmit path definitely
could use a good reconsideration and cleanup.

I'm even open to having generic support at the generic net device TX
level to fixup the segmentation layout of the SKB so that it meets
the device's requirements.  We can do it more efficiently there too.

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