linux-kernel - Re: [PATCH v2] gpio: pca953x: fix irq_stat not updated when irq is disabled (irq

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Date:   Fri, 6 May 2022 17:01:17 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Puyou Lu <puyou.lu@...il.com>
Cc:     stable@...r.kernel.org, Linus Walleij <linus.walleij@...aro.org>,
        Marc Zyngier <maz@...terjones.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] gpio: pca953x: fix irq_stat not updated when irq is
 disabled (irq_mask not set)

On Fri, May 6, 2022 at 10:06 AM Puyou Lu <puyou.lu@...il.com> wrote:
>
> When one port's input state get inverted (eg. from low to hight) after
> pca953x_irq_setup but before setting irq_mask (by some other driver such as
> "gpio-keys"), the next inversion of this port (eg. from hight to low) will not
> be triggered any more (because irq_stat is not updated at the first time). Issue
> should be fixed after this commit.
>
> Fixes: 89ea8bbe9c3e ("gpio: pca953x.c: add interrupt handling capability")
> Signed-off-by: Puyou Lu <puyou.lu@...il.com>
>
> ---
>
> Change since v1:
> add fixes tag and commit message https://lore.kernel.org/lkml/20220501092201.16411-1-puyou.lu@gmail.com/
>
> ---
>  drivers/gpio/gpio-pca953x.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
> index d2fe76f3f34f..8726921a1129 100644
> --- a/drivers/gpio/gpio-pca953x.c
> +++ b/drivers/gpio/gpio-pca953x.c
> @@ -762,11 +762,11 @@ static bool pca953x_irq_pending(struct pca953x_chip *chip, unsigned long *pendin
>         bitmap_xor(cur_stat, new_stat, old_stat, gc->ngpio);
>         bitmap_and(trigger, cur_stat, chip->irq_mask, gc->ngpio);
>
> +       bitmap_copy(chip->irq_stat, new_stat, gc->ngpio);
> +
>         if (bitmap_empty(trigger, gc->ngpio))
>                 return false;
>
> -       bitmap_copy(chip->irq_stat, new_stat, gc->ngpio);
> -
>         bitmap_and(cur_stat, chip->irq_trig_fall, old_stat, gc->ngpio);
>         bitmap_and(old_stat, chip->irq_trig_raise, new_stat, gc->ngpio);
>         bitmap_or(new_stat, old_stat, cur_stat, gc->ngpio);
> --
> 2.17.1
>

Queued for fixes, thanks!

Bart