linux-kernel - Re: [PATCH v1 1/3] gpio: ep93xx: Fix port F hwirq numbers in handler

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Date:   Wed, 25 Jan 2023 10:39:57 +0100
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Nikita Shubin" <nikita.shubin@...uefel.me>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>
Cc:     "Hartley Sweeten" <hsweeten@...ionengravers.com>,
        "Alexander Sverdlin" <alexander.sverdlin@...il.com>,
        "Russell King" <linux@...linux.org.uk>,
        "Lukasz Majewski" <lukma@...x.de>,
        "Linus Walleij" <linus.walleij@...aro.org>,
        "Bartosz Golaszewski" <brgl@...ev.pl>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/3] gpio: ep93xx: Fix port F hwirq numbers in handler

On Wed, Jan 25, 2023, at 09:30, Nikita Shubin wrote:
> Fix wrong translation of irq numbers in port F handler, as ep93xx hwirqs
> increased by 1, we should simply decrease them by 1 in translation.
>
> Fixes: 482c27273f52 ("ARM: ep93xx: renumber interrupts")
> Signed-off-by: Nikita Shubin <nikita.shubin@...uefel.me>

Cc: stable@...r.kernel.org # v5.19+
Acked-by: Arnd Bergmann <arnd@...db.de>


> ---
>  drivers/gpio/gpio-ep93xx.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpio/gpio-ep93xx.c b/drivers/gpio/gpio-ep93xx.c
> index 2e1779709113..7edcdc575080 100644
> --- a/drivers/gpio/gpio-ep93xx.c
> +++ b/drivers/gpio/gpio-ep93xx.c
> @@ -148,7 +148,7 @@ static void ep93xx_gpio_f_irq_handler(struct irq_desc *desc)
>  	 */
>  	struct irq_chip *irqchip = irq_desc_get_chip(desc);
>  	unsigned int irq = irq_desc_get_irq(desc);
> -	int port_f_idx = ((irq + 1) & 7) ^ 4; /* {19..22,47..50} -> {0..7} */
> +	int port_f_idx = (irq & 7) ^ 4; /* {20..23,48..51} -> {0..7} */
>  	int gpio_irq = EP93XX_GPIO_F_IRQ_BASE + port_f_idx;
> 
>  	chained_irq_enter(irqchip, desc);
> -- 
> 2.37.4