Re: [PATCH] igb: Add MII write support

[Jacob Keller]

On 6/6/2024 11:31 AM, Andrew Lunn wrote:
>> Yea, its extremely easy to break things if you don't know what you're
>> doing here. So its more a question of "are we ok exposing yet another
>> way root can brick things?"
> 
> Many MAC drivers allow it, and we have not had complaints. It is not
> really something i'm a fan of, it in theory allows user space drivers
> for PHYs, but it is full of race conditions so in practice unlikely to
> work reliably.
> 
> If you are worried about it causing additional support issues because
> it gets abused, you could make it taint the kernel. That makes it
> clear all bets are off if used. For the use case presented here, a
> tainted kernel does not matter, it for lab testing, not production.
> 
>       Andrew
> 

This might be a good compromise. I don't feel too strong either way
regarding tainting the kernel. Adding support here I think will overall
be more helpful than harmful. I like the tainting idea as a way to help
reduce support burden and flag that something like this was done.

That being said, I don't think I personally have a problem with the
patch as-is given its intended use case so either way from me:

Acked-by: Jacob Keller <jacob.e.keller@xxxxxxxxx>