[lvc-project] [PATCH] net: dsa: add return value check of genphy_read_status()

[Alexandra Diupina]

21/03/24 02:48, Florian Fainelli пишет:
>
>
> On 15/03/2024 03:25, Александра Дюпина wrote:
>> Hello, Andrew!
>
> (please do not top-post)
>
>>
>> The dsa_register_switch() function is used in various DSA
>> drivers (in probe function), so it is necessary to check all
>> possible errors. If the return value (may be an error code)
>> of genphy_read_status() is not checked in
>> dsa_shared_port_fixed_link_register_of(), a possible error
>> in dsa_register_switch() may be missed.
>
> This is not a path that will fail, because the fixed PHY emulation 
> layer is not a real piece of hardware, therefore no MDIO read could 
> really cause a problem here. I don't have a strong opinion however if 
> you want to propagate it properly.

Hi, Florian!
I would like to make sure that I have understood you correctly. Checking 
the return value of genphy_read_status() in 
dsa_shared_port_fixed_link_register_of() is not needed because 
dsa_shared_port_fixed_link_register_of() is called if 
of_phy_is_fixed_link()==true (this means that the PHY emulation layer is 
used, link is registered by of_phy_register_fixed_link() without errors 
and therefore there cannot be an error in genphy_read_status()). Right?