[OpenWrt-Devel] [PATCH] ath79: use downstream ag71xx for Kernel 5.4

[David Bauer]

Hello,

On 3/13/20 1:29 PM, Petr Štetiar wrote:
> Bjørn Mork <bjorn at mork.no> [2020-03-13 09:29:49]:
> 
>> David Bauer <mail at david-bauer.net> writes:
>>
>>> --- a/target/linux/ath79/files-4.19/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
>>> +++ b/target/linux/ath79/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
>>> @@ -1581,7 +1581,7 @@ static int ag71xx_probe(struct platform_device *pdev)
>>>  	ag->stop_desc->next = (u32) ag->stop_desc_dma;
>>>  
>>>  	mac_addr = of_get_mac_address(np);
>>> -	if (mac_addr)
>>> +	if (mac_addr && !IS_ERR(mac_addr))
>>
>> bikeshedding...
> 
> Not bikeshedding at all, good catch. It's an issue which should be fixed.
> 
> It should be just `if (!IS_ERR(mac_addr))` because it's either valid pointer
> or ERR_PTR since 5.2 via commit d01f449c008a ("of_net: add NVMEM support to
> of_get_mac_address"). I would simply copy&paste the fragment from upstream
> ag71xx.c.

And we would need to wrap this statement in precompile conditions depending on the
kernel version. I like this idea compared to the current "solution".

> 681-NET-add-of_get_mac_address_mtd.patch needs to be updated for 5.4, that
> of_get_mac_address_mtd() shouldn't return NULL, but ERR_PTR instead.

I'm not quite sure about that. of_get_mac_address is the only caller and all other
sub-methods before of_get_mac_addr_nvmem there return NULL in case no valid MAC
address can be determined. As long as we are evaluating of_get_mac_address_mtd result
prior to the result of of_get_mac_addr_nvmem we should be okay.

Best wishes
David

> 
> -- ynezz
> 

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