Re: [PATCH net-next] net: mdio: Add netlink interface

[Vladimir Oltean]

On Tue, Mar 07, 2023 at 02:49:27PM +0100, Andrew Lunn wrote:
> On Tue, Mar 07, 2023 at 12:23:07PM +0100, Michael Walle wrote:
> > > To prevent userspace phy drivers, writes are disabled by default, and can
> > > only be enabled by editing the source.
> > 
> > Maybe we can just taint the kernel using add_taint()? I'm not sure if
> > that will prevent vendors writing user space drivers. Thoughts?
> 
> I was thinking about taint as well. But keep the same code structure,
> you need to edit it to enable write.

But as per the commit message, this locks us out of the following
legitimate uses:

- C45-over-C22 (reads)
- Atomic (why only atomic?) (read) access to paged registers

are we ok with the implications?