Re: [PATCH] drm/udl: fix line iterator in damage handling

[Eric Engestrom <eric.engestrom@imgtec.com>]

On Fri, Sep 23, 2016 at 12:36:02PM +0200, David Herrmann wrote:
> The udl damage handler is supposed to render 'height' lines, but its
> iterator has an obvious typo that makes it miss most lines if the
> rectangle does not cover 0/0.
> 
> Fix the damage handler to correctly render all lines.
> 
> This is a fallout from:
> 
>     commit e375882406d0cc24030746638592004755ed4ae0
>     Author: Noralf Trønnes <noralf@tronnes.org>
>     Date:   Thu Apr 28 17:18:37 2016 +0200
> 
>         drm/udl: Use drm_fb_helper deferred_io support
> 
> Tested-by: poma <poma@gmail.com>
> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> Signed-off-by: David Herrmann <dh.herrmann@gmail.com>

Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>

> ---
>  drivers/gpu/drm/udl/udl_fb.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/udl/udl_fb.c b/drivers/gpu/drm/udl/udl_fb.c
> index 9688bfa..611b6b9 100644
> --- a/drivers/gpu/drm/udl/udl_fb.c
> +++ b/drivers/gpu/drm/udl/udl_fb.c
> @@ -122,7 +122,7 @@ int udl_handle_damage(struct udl_framebuffer *fb, int x, int y,
>  		return 0;
>  	cmd = urb->transfer_buffer;
>  
> -	for (i = y; i < height ; i++) {
> +	for (i = y; i < y + height ; i++) {
>  		const int line_offset = fb->base.pitches[0] * i;
>  		const int byte_offset = line_offset + (x * bpp);
>  		const int dev_byte_offset = (fb->base.width * bpp * i) + (x * bpp);
> -- 
> 2.10.0
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