linux-kernel - Re: [PATCH 1/1] drm/vkms: check plane

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Date:   Thu, 14 Apr 2022 19:58:51 -0100
From:   Melissa Wen <mwen@...lia.com>
To:     Tales Lelo da Aparecida <tales.aparecida@...il.com>
Cc:     Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>,
        Melissa Wen <melissa.srw@...il.com>,
        Haneen Mohammed <hamohammed.sa@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        andrealmeid@...eup.net
Subject: Re: [PATCH 1/1] drm/vkms: check plane_composer->map[0] before using
 it

On 04/11, Tales Lelo da Aparecida wrote:
> Fix a copypasta error, which resulted in checking repeatedly if the
> primary_composer->map[0] was null, instead of checking each
> plane_composer while composing planes.
> 
> Signed-off-by: Tales Lelo da Aparecida <tales.aparecida@...il.com>

Hi Tales,

Nice catch!

I suggest you detail this issue with more information. The caller of
compose_plane() already checks primary_composer->map. In constrast,
plane_composer->map is never verified here before handling.
Also, add the 'Fixes' tag pointing to the commit that introduced this
issue.

Can you send a next version addressing these suggestions and already
adding Andre's reviewed-by tag?

Thanks for your patch.

Melissa

> ---
>  drivers/gpu/drm/vkms/vkms_composer.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/vkms/vkms_composer.c b/drivers/gpu/drm/vkms/vkms_composer.c
> index c6a1036bf2ea..b47ac170108c 100644
> --- a/drivers/gpu/drm/vkms/vkms_composer.c
> +++ b/drivers/gpu/drm/vkms/vkms_composer.c
> @@ -157,7 +157,7 @@ static void compose_plane(struct vkms_composer *primary_composer,
>  	void *vaddr;
>  	void (*pixel_blend)(const u8 *p_src, u8 *p_dst);
>  
> -	if (WARN_ON(iosys_map_is_null(&primary_composer->map[0])))
> +	if (WARN_ON(iosys_map_is_null(&plane_composer->map[0])))
>  		return;
>  
>  	vaddr = plane_composer->map[0].vaddr;
> -- 
> 2.35.1
> 

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