linux-kernel - Re: [PATCH] pinctrl: amd: Disable and mask interrupts on resume

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Date:   Mon, 20 Mar 2023 11:05:06 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Kornel Dulęba <korneld@...omium.org>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Basavaraj Natikar <Basavaraj.Natikar@....com>,
        Shyam Sundar S K <Shyam-sundar.S-k@....com>,
        upstream@...ihalf.com, rad@...ihalf.com, mattedavis@...gle.com
Subject: Re: [PATCH] pinctrl: amd: Disable and mask interrupts on resume

On Mon, Mar 20, 2023 at 10:33 AM Kornel Dulęba <korneld@...omium.org> wrote:

> This fixes a similar problem to the one observed in:
> commit 4e5a04be88fe ("pinctrl: amd: disable and mask interrupts on probe").
>
> On some systems, during suspend/resume cycle firmware leaves
> an interrupt enabled on a pin that is not used by the kernel.
> This confuses the AMD pinctrl driver and causes spurious interrupts.
>
> The driver already has logic to detect if a pin is used by the kernel.
> Leverage it to re-initialize interrupt fields of a pin only if it's not
> used by us.
>
> Signed-off-by: Kornel Dulęba <korneld@...omium.org>

Uh oh this looks serious.
Do we need a Fixes: tag and Cc: stable on this patch?

Yours,
Linus Walleij