The size of the framebuffer can either be stored in screen_info or
smem_len. Take both into account in the deferred I/O code.
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
drivers/gpu/drm/drm_fb_helper.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 7e96ed9efdb5..bb0b25209b3e 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -672,7 +672,7 @@ static void drm_fb_helper_memory_range_to_clip(struct fb_info *info, off_t off,
void drm_fb_helper_deferred_io(struct fb_info *info, struct list_head *pagereflist)
{
struct drm_fb_helper *helper = info->par;
- unsigned long start, end, min_off, max_off;
+ unsigned long start, end, min_off, max_off, total_size;
struct fb_deferred_io_pageref *pageref;
struct drm_rect damage_area;
@@ -690,7 +690,11 @@ void drm_fb_helper_deferred_io(struct fb_info *info, struct list_head *pagerefli
* of the screen and account for non-existing scanlines. Hence,
* keep the covered memory area within the screen buffer.
*/
- max_off = min(max_off, info->screen_size);
+ if (info->screen_size)
+ total_size = info->screen_size;
+ else
+ total_size = info->fix.smem_len;
+ max_off = min(max_off, total_size);
if (min_off < max_off) {
drm_fb_helper_memory_range_to_clip(info, min_off, max_off - min_off, &damage_area);
--
2.40.0
