• Petr Štetiar's avatar
    net: ethernet: fix similar warning reported by kbuild test robot · 2d2924af
    Petr Štetiar authored
    This patch fixes following (similar) warning reported by kbuild test robot:
    
     In function ‘memcpy’,
      inlined from ‘smsc75xx_init_mac_address’ at drivers/net/usb/smsc75xx.c:778:3,
      inlined from ‘smsc75xx_bind’ 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 ‘smsc75xx_bind’:
      ./include/linux/string.h:355:9: note: in a call to built-in function ‘__builtin_memcpy’
    
    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.
    
    I'm now changing all occurencies of memcpy to ether_addr_copy after the
    of_get_mac_address call, as it's very likely, that we're going to get
    similar reports from kbuild test robot in the future.
    
    Fixes: a51645f7 ("net: ethernet: support of_get_mac_address new ERR_PTR error")
    Reported-by: default avatarkbuild test robot <lkp@intel.com>
    Signed-off-by: default avatarPetr Štetiar <ynezz@true.cz>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    2d2924af
mac.c 23 KB