[PATCH v2 09/10] drm/fb-helper: Copy dma-buf map before flushing shadow fb

[Thomas Zimmermann]

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 at suse.de>
---
 drivers/gpu/drm/drm_fb_helper.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index b36d9852cdf7..d972ce75d180 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -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);
 
-- 
2.29.2