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

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Date:   Tue, 4 Apr 2023 16:01:45 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     William Breathitt Gray <william.gray@...aro.org>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>, 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/

This looks reasonable.
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij