linux-kernel - Re: [PATCH 01/19] irqchip: atmel-aic: fix wrong bit operation for IRQ priority

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Date:	Mon, 4 Jan 2016 09:11:31 +0100
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Milo Kim <milo.kim@...com>
Cc:	<tglx@...utronix.de>, <jason@...edaemon.net>,
	<marc.zyngier@....com>, <alexandre.belloni@...e-electrons.com>,
	<ludovic.desroches@...el.com>, <nicolas.ferre@...el.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/19] irqchip: atmel-aic: fix wrong bit operation for
 IRQ priority

Hi Milo,

On Mon, 4 Jan 2016 13:28:25 +0900
Milo Kim <milo.kim@...com> wrote:

> Atmel AIC has common structure for SMR (Source Mode Register).
> 
>   bit[6:5] Interrupt source type
>   bit[2:0] Priority level
>   Other bits are unused.
> 
> To update new priority value, bit[2:0] should be cleared first and then
> new priority level can be written. However, aic_common_set_priority()
> helper clears source type bits instead of priority bits.
> This patch fixes wrong mask bit operation.
> 
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Jason Cooper <jason@...edaemon.net>
> Cc: Marc Zyngier <marc.zyngier@....com>
> Cc: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
> Cc: Boris BREZILLON <boris.brezillon@...e-electrons.com>
> Cc: Ludovic Desroches <ludovic.desroches@...el.com>
> Cc: Nicolas Ferre <nicolas.ferre@...el.com>
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Milo Kim <milo.kim@...com>

Acked-by: Boris Brezillon <boris.brezillon@...e-electrons.com>

Can you also add

Fixes: b1479ebb7720 ("irqchip: atmel-aic: Add atmel AIC/AIC5 drivers")
Cc: stable@...r.kernel.org #v3.17+

Thanks,

Boris

> ---
>  drivers/irqchip/irq-atmel-aic-common.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/irqchip/irq-atmel-aic-common.c b/drivers/irqchip/irq-atmel-aic-common.c
> index b12a5d5..37199b9 100644
> --- a/drivers/irqchip/irq-atmel-aic-common.c
> +++ b/drivers/irqchip/irq-atmel-aic-common.c
> @@ -86,7 +86,7 @@ int aic_common_set_priority(int priority, unsigned *val)
>  	    priority > AT91_AIC_IRQ_MAX_PRIORITY)
>  		return -EINVAL;
>  
> -	*val &= AT91_AIC_PRIOR;
> +	*val &= ~AT91_AIC_PRIOR;
>  	*val |= priority;
>  
>  	return 0;



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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