Re: [PATCH v2 2/2] e1000e: ignore factory-default checksum value on TGP platform

[Simon Horman <horms@kernel.org>]

On Tue, Jun 24, 2025 at 02:51:09PM +0200, Jacek Kowalski wrote:
> > > +	if (hw->mac.type == e1000_pch_tgp && checksum == (u16)NVM_SUM_FACTORY_DEFAULT) {
> > 
> > I see that a similar cast is applied to NVM_SUM. But why?
> > If it's not necessary then I would advocate dropping it.
> 
> It's like that since the beginning of git history, tracing back to e1000:
> 
> $ git show 1da177e4c3f4:drivers/net/e1000/e1000_hw.c | grep -A 1 EEPROM_SUM
>     if(checksum == (uint16_t) EEPROM_SUM)
>         return E1000_SUCCESS;
> (...)
> 
> 
> I'd really prefer to keep it as-is here for a moment, since similar
> constructs are not only here, and then clean them up separately.
> 
> Examples instances from drivers/net/ethernet/intel:
> 
> e1000/e1000_ethtool.c:  if ((checksum != (u16)EEPROM_SUM) && !(*data))
> e1000/e1000_hw.c:       if (checksum == (u16)EEPROM_SUM)
> e1000e/ethtool.c:       if ((checksum != (u16)NVM_SUM) && !(*data))
> igb/e1000_82575.c:      if (checksum != (u16) NVM_SUM) {
> igb/e1000_nvm.c:        if (checksum != (u16) NVM_SUM) {
> igc/igc_nvm.c:  if (checksum != (u16)NVM_SUM) {

Ok. But can we look into cleaning this up as a follow-up?

Reviewed-by: Simon Horman <horms@kernel.org>