linux-kernel - Re: [PATCH] [next] i915/gvt: remove hardcoded value on crc32

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Date:   Tue, 8 Nov 2022 14:44:12 +0800
From:   Zhenyu Wang <zhenyuw@...ux.intel.com>
To:     Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@...il.com>
Cc:     Zhi Wang <zhi.a.wang@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [next] i915/gvt: remove hardcoded value on crc32_start
 calculation

On 2022.10.30 16:36:28 +1300, Paulo Miguel Almeida wrote:
> struct gvt_firmware_header has a crc32 member in which all members that
> come after the that field are used to calculate it. The previous
> implementation added the value '4' (crc32's u32 size) to calculate the
> crc32_start offset which came across as a bit cryptic until you take a
> deeper look at the struct.
> 
> This patch changes crc32_start offset to the 'version' member which is
> the first member of the struct gvt_firmware_header after crc32.
> 
> It's worth mentioning that doing a build before/after this patch results
> in no binary output differences.
> 
> Signed-off-by: Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@...il.com>
> ---
>  drivers/gpu/drm/i915/gvt/firmware.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/gvt/firmware.c b/drivers/gpu/drm/i915/gvt/firmware.c
> index 54fe442238c6..a683c22d5b64 100644
> --- a/drivers/gpu/drm/i915/gvt/firmware.c
> +++ b/drivers/gpu/drm/i915/gvt/firmware.c
> @@ -104,7 +104,7 @@ static int expose_firmware_sysfs(struct intel_gvt *gvt)
>  
>  	memcpy(p, gvt->firmware.mmio, info->mmio_size);
>  
> -	crc32_start = offsetof(struct gvt_firmware_header, crc32) + 4;
> +	crc32_start = offsetof(struct gvt_firmware_header, version);
>  	h->crc32 = crc32_le(0, firmware + crc32_start, size - crc32_start);
>  
>  	firmware_attr.size = size;
> -- 
> 2.25.4
> 

Reviewed-by: Zhenyu Wang <zhenyuw@...ux.intel.com>

thanks!

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