@@ -2246,6 +2246,9 @@ static ssize_t drm_fbdev_fb_read(struct fb_info *info, char __user *buf,
if (total_size - count < pos)
count = total_size - pos;
+ if (info->fbops->fb_sync)
+ info->fbops->fb_sync(info);
+
if (drm_fbdev_use_iomem(info))
ret = fb_read_screen_base(info, buf, count, pos);
else
@@ -2327,6 +2330,9 @@ static ssize_t drm_fbdev_fb_write(struct fb_info *info, const char __user *buf,
count = total_size - pos;
}
+ if (info->fbops->fb_sync)
+ info->fbops->fb_sync(info);
+
/*
* Copy to framebuffer even if we already logged an error. Emulates
* the behavior of the original fbdev implementation.
Call struct fb_ops.fb_sync in drm_fbdev_{read,write}() to mimic the behavior of fbdev. Fbdev implementations of fb_read and fb_write in struct fb_ops invoke fb_sync to synchronize with outstanding operations before I/O. Doing the same in DRM implementations will allow us to use them throughout DRM drivers. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> --- drivers/gpu/drm/drm_fb_helper.c | 6 ++++++ 1 file changed, 6 insertions(+)