[PATCH 0/5] gpiolib: Handle immutable irq_chip structures

[Linus Walleij]

On Wed, Feb 23, 2022 at 4:44 PM Marc Zyngier <maz at kernel.org> wrote:

> I recently realised that the gpiolib play ugly tricks on the
> unsuspecting irq_chip structures by patching the callbacks.

Sorry about that...

> My current approach is to add a new irq_chip flag (IRQCHIP_IMMUTABLE)
> which does what it says on the tin: don't you dare writing there.
> Gpiolib is further updated not to install its own callbacks, and it
> becomes the responsibility of the driver to call into the gpiolib when
> required. This is similar to what we do for other subsystems such as
> PCI-MSI.

OK if there is a precedent it is usually wise to follow.

> I'd welcome comments on the approach. If deemed acceptable, there are
> another 300+ drivers to update! Not to mention the documentation. I
> appreciate that this is a lot of potential changes, but the current
> situation is messy.

I'm happy with this approach as long as the 300+ drivers get fixed
and the old way of doing it gets deleted.

Yours,
Linus Walleij