[PATCH 5/5] drm/core: Fix old_fb handling in pan_display_atomic.

[Daniel Vetter]

On Wed, Nov 11, 2015 at 11:29:11AM +0100, Maarten Lankhorst wrote:
> From: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> 
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>

Needs "Don't touch plane->old_fb/fb without having the right locks held."
like the previous patch in the commit message. With that for patches 4&5:

Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>

> ---
>  drivers/gpu/drm/drm_fb_helper.c | 30 ++++++++----------------------
>  1 file changed, 8 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index abd50863506e..69cbab5e5c81 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -1227,7 +1227,9 @@ static int pan_display_atomic(struct fb_var_screeninfo *var,
>  	struct drm_fb_helper *fb_helper = info->par;
>  	struct drm_device *dev = fb_helper->dev;
>  	struct drm_atomic_state *state;
> +	struct drm_plane *plane;
>  	int i, ret;
> +	unsigned plane_mask;
>  
>  	state = drm_atomic_state_alloc(dev);
>  	if (!state)
> @@ -1235,19 +1237,22 @@ static int pan_display_atomic(struct fb_var_screeninfo *var,
>  
>  	state->acquire_ctx = dev->mode_config.acquire_ctx;
>  retry:
> +	plane_mask = 0;
>  	for(i = 0; i < fb_helper->crtc_count; i++) {
>  		struct drm_mode_set *mode_set;
>  
>  		mode_set = &fb_helper->crtc_info[i].mode_set;
>  
> -		mode_set->crtc->primary->old_fb = mode_set->crtc->primary->fb;
> -
>  		mode_set->x = var->xoffset;
>  		mode_set->y = var->yoffset;
>  
>  		ret = __drm_atomic_helper_set_config(mode_set, state);
>  		if (ret != 0)
>  			goto fail;
> +
> +		plane = mode_set->crtc->primary;
> +		plane_mask |= drm_plane_index(plane);
> +		plane->old_fb = plane->fb;
>  	}
>  
>  	ret = drm_atomic_commit(state);
> @@ -1259,26 +1264,7 @@ retry:
>  
>  
>  fail:
> -	for(i = 0; i < fb_helper->crtc_count; i++) {
> -		struct drm_mode_set *mode_set;
> -		struct drm_plane *plane;
> -
> -		mode_set = &fb_helper->crtc_info[i].mode_set;
> -		plane = mode_set->crtc->primary;
> -
> -		if (ret == 0) {
> -			struct drm_framebuffer *new_fb = plane->state->fb;
> -
> -			if (new_fb)
> -				drm_framebuffer_reference(new_fb);
> -			plane->fb = new_fb;
> -			plane->crtc = plane->state->crtc;
> -
> -			if (plane->old_fb)
> -				drm_framebuffer_unreference(plane->old_fb);
> -		}
> -		plane->old_fb = NULL;
> -	}
> +	drm_atomic_clean_old_fb(dev, plane_mask, ret);
>  
>  	if (ret == -EDEADLK)
>  		goto backoff;
> -- 
> 2.1.0
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch