Re: [PATCH] ipheth.c: Enable IP header alignment

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On Sun, 2011-05-01 at 13:00 +0200, L. Alberto GimÃnez wrote:
> From: David Hill <david.hill@xxxxxxxxxxx>
> 
> Since commit ea812ca1b06113597adcd8e70c0f84a413d97544, NET_IP_ALIGN changed from
> 2 to 0. Some people have reported that tethering stopped working and David Hill
> submited a patch that seems to fix the problem.
> 
> I have no more an iPhone device to test it, so it is only compile-tested.
> 
> Signed-off-by: L. Alberto GimÃnez <agimenez@xxxxxxxxxxx>
> ---
>  drivers/net/usb/ipheth.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/net/usb/ipheth.c b/drivers/net/usb/ipheth.c
> index 7d42f9a..711346b 100644
> --- a/drivers/net/usb/ipheth.c
> +++ b/drivers/net/usb/ipheth.c
> @@ -54,6 +54,9 @@
>  #include <linux/usb.h>
>  #include <linux/workqueue.h>
>  
> +#undef  NET_IP_ALIGN
> +#define NET_IP_ALIGN 2
> +
>  #define USB_VENDOR_APPLE        0x05ac
>  #define USB_PRODUCT_IPHONE      0x1290
>  #define USB_PRODUCT_IPHONE_3G   0x1292

No, you can't do this.

If there is some reason to use a fixed alignment of 2 (which I find hard
to believe; this is a USB device after all) then that should be
specified as a private constant.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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