RE: [PATCH net-next v2 4/4] net: usb: smsc: fix warning reported by kbuild test robot

[Woojung.Huh]

> This patch fixes following warning reported by kbuild test robot:
> 
>  In function âmemcpyâ,
>      inlined from âsmsc75xx_init_mac_addressâ at drivers/net/usb/smsc75xx.c:778:3,
>      inlined from âsmsc75xx_bindâ at drivers/net/usb/smsc75xx.c:1501:2:
>  ./include/linux/string.h:355:9: warning: argument 2 null where non-null expected [-Wnonnull]
>    return __builtin_memcpy(p, q, size);
>           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
>  drivers/net/usb/smsc75xx.c: In function âsmsc75xx_bindâ:
>  ./include/linux/string.h:355:9: note: in a call to built-in function â__builtin_memcpyâ
> 
> I've replaced the offending memcpy with ether_addr_copy, because I'm
> 100% sure, that of_get_mac_address can't return NULL as it returns valid
> pointer or ERR_PTR encoded value, nothing else.
> 
> I'm hesitant to just change IS_ERR into IS_ERR_OR_NULL check, as this
> would make the warning disappear also, but it would be confusing to
> check for impossible return value just to make a compiler happy.
> 
> Fixes: adfb3cb2c52e ("net: usb: support of_get_mac_address new ERR_PTR error")
> Reported-by: kbuild test robot <lkp@xxxxxxxxx>
> Signed-off-by: Petr Åtetiar <ynezz@xxxxxxx>
> ---

Reviewed-by: Woojung Huh <woojung.huh@xxxxxxxxxxxxx>