Re: [RFC PATCH v1] platform/x86: wmi: Do not register driver with invalid GUID

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

On Thu, Jul 27, 2023 at 10:54:26PM +0000, Barnabás Pőcze wrote:
> 2023. július 26., szerda 10:45 keltezéssel, Hans de Goede <hdegoede@redhat.com> írta:
> > On 7/15/23 23:24, Barnabás Pőcze wrote:

...

> > I think that having an additional check like the one which you
> > propose has some value too, even if it is just to cover drivers
> > which for some reason don't use `MODULE_DEVICE_TABLE()`, but IMHO
> > the most important check to have is a check in file2alias.c .
> 
> Okay... any tips on how to avoid copying `uuid_is_valid()`?

I think I already told the rough design: we need to split uuid.c to three
files: libuuid.h, libuuid.c uuid.c and libuuid.c should be built twice:
once for uuid.c and once for file2alias.c. libuuid.h should contain the
definitions file2alias.c is using.  Something like that.

> Another idea I had was that maybe `struct wmi_device_id::guid_string` needs to be
> changed to be `guid_t` and then `GUID_INIT()` or something similar could be used
> to initialize it. That way it is impossible to mess up the format. The only downside
> I can see is that guid is no longer "grep-able".

Strictly speaking you may not do that because it's a (semi-)ABI.

-- 
With Best Regards,
Andy Shevchenko