drm/sis: clean up reclaim_buffers

Like for via.

v2: Actually drop the idlelock again if taken.

v3: Fixup.

v4: Fixup the "has master" vs. "is master" confusion the refactor
introduced.

v5: Drop the idlelock in the early return path.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/sis/sis_drv.c

@@ -105,10 +105,9 @@ static struct drm_driver driver = {
 	.load = sis_driver_load,
 	.unload = sis_driver_unload,
 	.open = sis_driver_open,
+	.preclose = sis_reclaim_buffers_locked,
 	.postclose = sis_driver_postclose,
 	.dma_quiescent = sis_idle,
-	.reclaim_buffers = NULL,
-	.reclaim_buffers_idlelocked = sis_reclaim_buffers_locked,
 	.lastclose = sis_lastclose,
 	.ioctls = sis_ioctls,
 	.fops = &sis_driver_fops,

drivers/gpu/drm/sis/sis_mm.c

@@ -321,14 +321,20 @@ void sis_reclaim_buffers_locked(struct drm_device *dev,
 	struct sis_file_private *file_priv = file->driver_priv;
 	struct sis_memblock *entry, *next;
 
+	if (!(file->minor->master && file->master->lock.hw_lock))
+		return;
+
+	drm_idlelock_take(&file->master->lock);
+
 	mutex_lock(&dev->struct_mutex);
 	if (list_empty(&file_priv->obj_list)) {
 		mutex_unlock(&dev->struct_mutex);
+		drm_idlelock_release(&file->master->lock);
+
 		return;
 	}
 
-	if (dev->driver->dma_quiescent)
-		dev->driver->dma_quiescent(dev);
+	sis_idle(dev);
 
 
 	list_for_each_entry_safe(entry, next, &file_priv->obj_list,
@@ -343,6 +349,9 @@ void sis_reclaim_buffers_locked(struct drm_device *dev,
 		kfree(entry);
 	}
 	mutex_unlock(&dev->struct_mutex);
+
+	drm_idlelock_release(&file->master->lock);
+
 	return;
 }