linux-kernel - Re: [PATCH] irqchip: gic-v3-its: fix entry size mask for GITS

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Message-ID: <5804E924.2060106@arm.com>
Date:   Mon, 17 Oct 2016 16:07:16 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Vladimir Murzin <vladimir.murzin@....com>,
        linux-kernel@...r.kernel.org
Cc:     linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] irqchip: gic-v3-its: fix entry size mask for GITS_BASER

On 17/10/16 16:00, Vladimir Murzin wrote:
> Entry Size in GITS_BASER<n> occupies 5 bits [52:48], but we mask out 8
> bits.
> 
> Fixes: cc2d3216f53c ("irqchip: GICv3: ITS command queue")
> 
> Signed-off-by: Vladimir Murzin <vladimir.murzin@....com>
> ---
>  include/linux/irqchip/arm-gic-v3.h |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
> index 7dec96f..5118d3a 100644
> --- a/include/linux/irqchip/arm-gic-v3.h
> +++ b/include/linux/irqchip/arm-gic-v3.h
> @@ -290,7 +290,7 @@
>  #define GITS_BASER_TYPE_SHIFT			(56)
>  #define GITS_BASER_TYPE(r)		(((r) >> GITS_BASER_TYPE_SHIFT) & 7)
>  #define GITS_BASER_ENTRY_SIZE_SHIFT		(48)
> -#define GITS_BASER_ENTRY_SIZE(r)	((((r) >> GITS_BASER_ENTRY_SIZE_SHIFT) & 0xff) + 1)
> +#define GITS_BASER_ENTRY_SIZE(r)	((((r) >> GITS_BASER_ENTRY_SIZE_SHIFT) & 0x1f) + 1)
>  #define GITS_BASER_SHAREABILITY_SHIFT	(10)
>  #define GITS_BASER_InnerShareable					\
>  	GIC_BASER_SHAREABILITY(GITS_BASER, InnerShareable)
> 

Nice catch. I'll queue that in my fix branch (and add a Cc to stable,
since this is a 2 year old bug...).

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...