drm/gud: Split up gud_flush_work()

In preparation for inlining synchronous flushing split out the part of
gud_flush_work() that can be shared by the sync and async code paths.
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20221122-gud-shadow-plane-v2-3-435037990a83@tronnes.org

drivers/gpu/drm/gud/gud_pipe.c

@@ -333,45 +333,30 @@ void gud_clear_damage(struct gud_device *gdrm)
 	gdrm->damage.y2 = 0;
 }
 
-void gud_flush_work(struct work_struct *work)
+static void gud_flush_damage(struct gud_device *gdrm, struct drm_framebuffer *fb,
+			     struct drm_rect *damage)
 {
-	struct gud_device *gdrm = container_of(work, struct gud_device, work);
 	const struct drm_format_info *format;
-	struct drm_framebuffer *fb;
-	struct drm_rect damage;
 	unsigned int i, lines;
-	int idx, ret = 0;
 	size_t pitch;
-
-	if (!drm_dev_enter(&gdrm->drm, &idx))
-		return;
-
-	mutex_lock(&gdrm->damage_lock);
-	fb = gdrm->fb;
-	gdrm->fb = NULL;
-	damage = gdrm->damage;
-	gud_clear_damage(gdrm);
-	mutex_unlock(&gdrm->damage_lock);
-
-	if (!fb)
-		goto out;
+	int ret;
 
 	format = fb->format;
 	if (format->format == DRM_FORMAT_XRGB8888 && gdrm->xrgb8888_emulation_format)
 		format = gdrm->xrgb8888_emulation_format;
 
 	/* Split update if it's too big */
-	pitch = drm_format_info_min_pitch(format, 0, drm_rect_width(&damage));
-	lines = drm_rect_height(&damage);
+	pitch = drm_format_info_min_pitch(format, 0, drm_rect_width(damage));
+	lines = drm_rect_height(damage);
 
 	if (gdrm->bulk_len < lines * pitch)
 		lines = gdrm->bulk_len / pitch;
 
-	for (i = 0; i < DIV_ROUND_UP(drm_rect_height(&damage), lines); i++) {
-		struct drm_rect rect = damage;
+	for (i = 0; i < DIV_ROUND_UP(drm_rect_height(damage), lines); i++) {
+		struct drm_rect rect = *damage;
 
 		rect.y1 += i * lines;
-		rect.y2 = min_t(u32, rect.y1 + lines, damage.y2);
+		rect.y2 = min_t(u32, rect.y1 + lines, damage->y2);
 
 		ret = gud_flush_rect(gdrm, fb, format, &rect);
 		if (ret) {
@@ -382,9 +367,30 @@ void gud_flush_work(struct work_struct *work)
 			gdrm->prev_flush_failed = true;
 			break;
 		}
-
-		gdrm->prev_flush_failed = false;
 	}
+}
+
+void gud_flush_work(struct work_struct *work)
+{
+	struct gud_device *gdrm = container_of(work, struct gud_device, work);
+	struct drm_framebuffer *fb;
+	struct drm_rect damage;
+	int idx;
+
+	if (!drm_dev_enter(&gdrm->drm, &idx))
+		return;
+
+	mutex_lock(&gdrm->damage_lock);
+	fb = gdrm->fb;
+	gdrm->fb = NULL;
+	damage = gdrm->damage;
+	gud_clear_damage(gdrm);
+	mutex_unlock(&gdrm->damage_lock);
+
+	if (!fb)
+		goto out;
+
+	gud_flush_damage(gdrm, fb, &damage);
 
 	drm_framebuffer_put(fb);
 out: