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drm/fb-helper: Copy dma-buf map before flushing shadow fb 

Copy the vmap()'ed instance of struct dma_buf_map before modifying it,
in case the implementation of vunmap() depends on the exact address.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Maxime Ripard <mripard@kernel.org>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20201120102545.4047-10-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2020-11-20 11:25:44 +01:00
parent 4270d6f60d
commit 7d4d269c09
1 changed files with 3 additions and 2 deletions
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5
drivers/gpu/drm/drm_fb_helper.c
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@ -395,14 +395,15 @@ static int drm_fb_helper_damage_blit(struct drm_fb_helper *fb_helper,
struct drm_clip_rect *clip)
{
struct drm_client_buffer *buffer = fb_helper->buffer;
struct dma_buf_map map;
struct dma_buf_map map, dst;
int ret;
ret = drm_client_buffer_vmap(buffer, &map);
if (ret)
return ret;
drm_fb_helper_damage_blit_real(fb_helper, clip, &map);
dst = map;
drm_fb_helper_damage_blit_real(fb_helper, clip, &dst);
drm_client_buffer_vunmap(buffer);