linux-kernel - Re: [PATCH v3 08/12] drm/udl: Pass rectangle directly to udl_handle

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <f9fb7d5d-6858-e221-098a-a8729e8a1857@suse.de>
Date:   Thu, 8 Sep 2022 14:47:52 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     Daniel Vetter <daniel.vetter@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 08/12] drm/udl: Pass rectangle directly to
 udl_handle_damage()

Hi

Am 08.09.22 um 11:51 schrieb Takashi Iwai:
> Just for some code simplification.
> 
> Suggested-by: Thomas Zimmermann <tzimmermann@...e.de>
> Signed-off-by: Takashi Iwai <tiwai@...e.de>

With my comments fixed, you can add

Acked-by: Thomas Zimmermann <tzimmermann@...e.de>

> ---
>   drivers/gpu/drm/udl/udl_modeset.c | 20 +++++++++-----------
>   1 file changed, 9 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/udl/udl_modeset.c b/drivers/gpu/drm/udl/udl_modeset.c
> index c9b837ac26a7..0142fc6a478a 100644
> --- a/drivers/gpu/drm/udl/udl_modeset.c
> +++ b/drivers/gpu/drm/udl/udl_modeset.c
> @@ -244,14 +244,13 @@ static long udl_log_cpp(unsigned int cpp)
>   
>   static int udl_handle_damage(struct drm_framebuffer *fb,
>   			     const struct iosys_map *map,
> -			     int x, int y, int width, int height)
> +			     struct drm_rect *clip)

Should probably be declared const.

>   {
>   	struct drm_device *dev = fb->dev;
>   	void *vaddr = map->vaddr; /* TODO: Use mapping abstraction properly */
>   	int i, ret;
>   	char *cmd;
>   	struct urb *urb;
> -	struct drm_rect clip;
>   	int log_bpp;
>   
>   	ret = udl_log_cpp(fb->format->cpp[0]);
> @@ -259,8 +258,6 @@ static int udl_handle_damage(struct drm_framebuffer *fb,
>   		return ret;
>   	log_bpp = ret;
>   
> -	drm_rect_init(&clip, x, y, width, height);
> -
>   	ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
>   	if (ret)
>   		return ret;
> @@ -272,11 +269,11 @@ static int udl_handle_damage(struct drm_framebuffer *fb,
>   	}
>   	cmd = urb->transfer_buffer;
>   
> -	for (i = clip.y1; i < clip.y2; i++) {
> +	for (i = clip->y1; i < clip->y2; i++) {
>   		const int line_offset = fb->pitches[0] * i;
> -		const int byte_offset = line_offset + (clip.x1 << log_bpp);
> -		const int dev_byte_offset = (fb->width * i + clip.x1) << log_bpp;
> -		const int byte_width = (clip.x2 - clip.x1) << log_bpp;
> +		const int byte_offset = line_offset + (clip->x1 << log_bpp);
> +		const int dev_byte_offset = (fb->width * i + clip->x1) << log_bpp;
> +		const int byte_width = (clip->x2 - clip->x1) << log_bpp;

Please use drm_rect_width(clip) instead. Somehow there's already too 
much code that open-codes this.

>   		ret = udl_render_hline(dev, log_bpp, &urb, (char *)vaddr,
>   				       &cmd, byte_offset, dev_byte_offset,
>   				       byte_width);
> @@ -329,6 +326,7 @@ udl_simple_display_pipe_enable(struct drm_simple_display_pipe *pipe,
>   	struct udl_device *udl = to_udl(dev);
>   	struct drm_display_mode *mode = &crtc_state->mode;
>   	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
> +	struct drm_rect clip;

Better do a static init with DRM_RECT_INIT(0, 0, fb->width, fb->height) 
and remove the other init call below.

Best regards
Thomas

>   	char *buf;
>   	char *wrptr;
>   	int color_depth = UDL_COLOR_DEPTH_16BPP;
> @@ -354,7 +352,8 @@ udl_simple_display_pipe_enable(struct drm_simple_display_pipe *pipe,
>   
>   	udl->mode_buf_len = wrptr - buf;
>   
> -	udl_handle_damage(fb, &shadow_plane_state->data[0], 0, 0, fb->width, fb->height);
> +	drm_rect_init(&clip, 0, 0, fb->width, fb->height);
> +	udl_handle_damage(fb, &shadow_plane_state->data[0], &clip);
>   
>   	/* enable display */
>   	udl_crtc_write_mode_to_hw(crtc);
> @@ -396,8 +395,7 @@ udl_simple_display_pipe_update(struct drm_simple_display_pipe *pipe,
>   		return;
>   
>   	if (drm_atomic_helper_damage_merged(old_plane_state, state, &rect))
> -		udl_handle_damage(fb, &shadow_plane_state->data[0], rect.x1, rect.y1,
> -				  rect.x2 - rect.x1, rect.y2 - rect.y1);
> +		udl_handle_damage(fb, &shadow_plane_state->data[0], &rect);
>   }
>   
>   static const struct drm_simple_display_pipe_funcs udl_simple_display_pipe_funcs = {

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

Download attachment "OpenPGP_signature" of type "application/pgp-signature" (841 bytes)