drm/fb-helper: Remove damage worker

The fbdev damage worker is unused, so remove it.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20221115115819.23088-7-tzimmermann@suse.de

drivers/gpu/drm/drm_fb_helper.c

@@ -403,13 +403,6 @@ static void drm_fb_helper_fb_dirty(struct drm_fb_helper *helper)
 	spin_unlock_irqrestore(&helper->damage_lock, flags);
 }
 
-static void drm_fb_helper_damage_work(struct work_struct *work)
-{
-	struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper, damage_work);
-
-	drm_fb_helper_fb_dirty(helper);
-}
-
 /**
  * drm_fb_helper_prepare - setup a drm_fb_helper structure
  * @dev: DRM device
@@ -425,7 +418,6 @@ void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
 	INIT_LIST_HEAD(&helper->kernel_fb_list);
 	spin_lock_init(&helper->damage_lock);
 	INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker);
-	INIT_WORK(&helper->damage_work, drm_fb_helper_damage_work);
 	helper->damage_clip.x1 = helper->damage_clip.y1 = ~0;
 	mutex_init(&helper->lock);
 	helper->funcs = funcs;
@@ -557,7 +549,6 @@ void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 		return;
 
 	cancel_work_sync(&fb_helper->resume_work);
-	cancel_work_sync(&fb_helper->damage_work);
 
 	info = fb_helper->info;
 	if (info) {

include/drm/drm_fb_helper.h

@@ -116,7 +116,6 @@ struct drm_fb_helper_funcs {
  * @damage_clip: clip rectangle used with deferred_io to accumulate damage to
  *                the screen buffer
  * @damage_lock: spinlock protecting @damage_clip
- * @damage_work: worker used to flush the framebuffer
  * @resume_work: worker used during resume if the console lock is already taken
  *
  * This is the main structure used by the fbdev helpers. Drivers supporting
@@ -146,7 +145,6 @@ struct drm_fb_helper {
 	u32 pseudo_palette[17];
 	struct drm_clip_rect damage_clip;
 	spinlock_t damage_lock;
-	struct work_struct damage_work;
 	struct work_struct resume_work;
 
 	/**