Re: [PATCH net-next] net: phy: fix issue with loading PHY driver w/o initramfs

[Heiner Kallweit <hkallweit1@gmail.com>]

On 22.01.2019 23:45, David Miller wrote:
> From: Heiner Kallweit <hkallweit1@gmail.com>
> Date: Sat, 19 Jan 2019 10:30:21 +0100
> 
>> It was reported that on a system with nfsboot and w/o initramfs network
>> fails because trying to load the PHY driver returns -ENOENT. Reason was
>> that due to missing initramfs the modprobe binary isn't available.
>> So we have to ignore error code -ENOENT.
>>
>> Fixes: 13d0ab6750b2 ("net: phy: check return code when requesting PHY driver module")
>> Reported-by: Krzysztof Kozlowski <krzk@kernel.org>
>> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
> 
> Applied.
> 
> However, I agree with Geert that we should adopt the:
> 
> 	if (module_not_present)
> 		request_module();
> 	if (module_not_present)
> 		goto failed_to_load;
> 
> pattern.
> 
I know this is the standard pattern for request_module().
Unfortunately the situation is a little bit tricky with PHY drivers.
We don't know whether there's a module matching the PHY ID and
it's a valid use case that there's no such module.
In such a case we bind the genphy driver later, and a lot of PHY's
are totally happy with the genphy driver and therefore no dedicated
PHY drivers exist.