[PATCH v3 07/14] drm/panic: Return from screen_user if display is too small

[Jocelyn Falempe]

On 9/2/26 14:13, Thomas Zimmermann wrote:
> Return an error if the display is too small to display at least a
> single character. If the panic handler cannot display any message
> it does at least not destroy the current output, which might help
> with identifying the problem.
> 
> This change duplicates the logic from screen_kmsg output.

Thanks, it looks good to me.

maybe add a check also for font->height > sb->height

Reviewed-by: Jocelyn Falempe <jfalempe at redhat.com>
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
> ---
>   drivers/gpu/drm/drm_panic.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_panic.c b/drivers/gpu/drm/drm_panic.c
> index f597ef04c5bc..c317afc76669 100644
> --- a/drivers/gpu/drm/drm_panic.c
> +++ b/drivers/gpu/drm/drm_panic.c
> @@ -486,7 +486,7 @@ static int draw_panic_screen_user(struct drm_scanout_buffer *sb, u32 fg_color, u
>   	struct drm_rect r_screen, r_logo, r_msg;
>   	unsigned int msg_width, msg_height;
>   
> -	if (!font)
> +	if (!font || font->width > sb->width)
>   		return -EINVAL;
>   
>   	fg_color = drm_draw_color_from_xrgb8888(fg_color, sb->format->format);