linux-kernel - Re: [PATCH 0/2] Fix possible deadlocks for i8255 GPIO drivers

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Date:   Tue, 11 Apr 2023 21:08:59 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     William Breathitt Gray <william.gray@...aro.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Fix possible deadlocks for i8255 GPIO drivers

On Mon, Apr 3, 2023 at 7:53 PM William Breathitt Gray
<william.gray@...aro.org> wrote:
>
> The 104-dio-48e and 104-idi-48 drivers leverage regmap-irq to handle
> IRQ. The default regmap locking utilizes spinlocks but this can result
> in deadlocks for IRQ chips when running -rt kernels [0]. Enable
> use_raw_spinlock for the regmap_config of these drivers to prevent such.
>
> [0] https://lore.kernel.org/all/1466065537-82027-1-git-send-email-mika.westerberg@linux.intel.com/
>
> William Breathitt Gray (2):
>   gpio: 104-dio-48e: Enable use_raw_spinlock for dio48e_regmap_config
>   gpio: 104-idi-48: Enable use_raw_spinlock for idi48_regmap_config
>
>  drivers/gpio/gpio-104-dio-48e.c | 1 +
>  drivers/gpio/gpio-104-idi-48.c  | 1 +
>  2 files changed, 2 insertions(+)
>
>
> base-commit: d49765b5f4320a402fbc4ed5edfd73d87640f27c
> --
> 2.39.2
>

Both queued for fixes.

Bart