drm/legacy: move lock cleanup for master into lock file (v2)

This makes it easier to remove legacy code later.

v2: move check into lock file as well.
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/drm_auth.c

@@ -274,21 +274,7 @@ void drm_master_release(struct drm_file *file_priv)
 	if (!drm_is_current_master(file_priv))
 		goto out;
 
-	if (drm_core_check_feature(dev, DRIVER_LEGACY)) {
-		/*
-		 * Since the master is disappearing, so is the
-		 * possibility to lock.
-		 */
-		mutex_lock(&dev->struct_mutex);
-		if (master->lock.hw_lock) {
-			if (dev->sigdata.lock == master->lock.hw_lock)
-				dev->sigdata.lock = NULL;
-			master->lock.hw_lock = NULL;
-			master->lock.file_priv = NULL;
-			wake_up_interruptible_all(&master->lock.lock_queue);
-		}
-		mutex_unlock(&dev->struct_mutex);
-	}
+	drm_legacy_lock_master_cleanup(dev, master);
 
 	if (dev->master == file_priv->master)
 		drm_drop_master(dev, file_priv);

drivers/gpu/drm/drm_legacy.h

@@ -126,4 +126,5 @@ int drm_legacy_sg_alloc(struct drm_device *dev, void *data,
 int drm_legacy_sg_free(struct drm_device *dev, void *data,
 		       struct drm_file *file_priv);
 
+void drm_legacy_lock_master_cleanup(struct drm_device *dev, struct drm_master *master);
 #endif /* __DRM_LEGACY_H__ */

drivers/gpu/drm/drm_lock.c

@@ -347,3 +347,22 @@ void drm_legacy_lock_release(struct drm_device *dev, struct file *filp)
 				     _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
 	}
 }
+
+void drm_legacy_lock_master_cleanup(struct drm_device *dev, struct drm_master *master)
+{
+	if (!drm_core_check_feature(dev, DRIVER_LEGACY))
+		return;
+
+	/*
+	 * Since the master is disappearing, so is the
+	 * possibility to lock.
+	 */	mutex_lock(&dev->struct_mutex);
+	if (master->lock.hw_lock) {
+		if (dev->sigdata.lock == master->lock.hw_lock)
+			dev->sigdata.lock = NULL;
+		master->lock.hw_lock = NULL;
+		master->lock.file_priv = NULL;
+		wake_up_interruptible_all(&master->lock.lock_queue);
+	}
+	mutex_unlock(&dev->struct_mutex);
+}