---

yaml
---
r: 174499
b: refs/heads/master
c: 862302f
h: refs/heads/master
i:
  174497: c99bfe1
  174495: 2e504e3
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 9340d8cfeacd16cef1cbe94527f7baaed7640669
+refs/heads/master: 862302ffe422378a5213f558fc5cdf62c37050a9

trunk/drivers/gpu/drm/drm_fops.c

@@ -300,6 +300,18 @@ static int drm_open_helper(struct inode *inode, struct file *filp,
 				goto out_free;
 			}
 		}
+		mutex_lock(&dev->struct_mutex);
+		if (dev->driver->master_set) {
+			ret = dev->driver->master_set(dev, priv, true);
+			if (ret) {
+				/* drop both references if this fails */
+				drm_master_put(&priv->minor->master);
+				drm_master_put(&priv->master);
+				mutex_unlock(&dev->struct_mutex);
+				goto out_free;
+			}
+		}
+		mutex_unlock(&dev->struct_mutex);
 	} else {
 		/* get a reference to the master */
 		priv->master = drm_master_get(priv->minor->master);
@@ -533,6 +545,8 @@ int drm_release(struct inode *inode, struct file *filp)
 
 		if (file_priv->minor->master == file_priv->master) {
 			/* drop the reference held my the minor */
+			if (dev->driver->master_drop)
+				dev->driver->master_drop(dev, file_priv, true);
 			drm_master_put(&file_priv->minor->master);
 		}
 	}

trunk/drivers/gpu/drm/drm_stub.c

@@ -174,6 +174,8 @@ void drm_master_put(struct drm_master **master)
 int drm_setmaster_ioctl(struct drm_device *dev, void *data,
 			struct drm_file *file_priv)
 {
+	int ret = 0;
+
 	if (file_priv->is_master)
 		return 0;
 
@@ -188,6 +190,13 @@ int drm_setmaster_ioctl(struct drm_device *dev, void *data,
 		mutex_lock(&dev->struct_mutex);
 		file_priv->minor->master = drm_master_get(file_priv->master);
 		file_priv->is_master = 1;
+		if (dev->driver->master_set) {
+			ret = dev->driver->master_set(dev, file_priv, false);
+			if (unlikely(ret != 0)) {
+				file_priv->is_master = 0;
+				drm_master_put(&file_priv->minor->master);
+			}
+		}
 		mutex_unlock(&dev->struct_mutex);
 	}
 
@@ -204,6 +213,8 @@ int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
 		return -EINVAL;
 
 	mutex_lock(&dev->struct_mutex);
+	if (dev->driver->master_drop)
+		dev->driver->master_drop(dev, file_priv, false);
 	drm_master_put(&file_priv->minor->master);
 	file_priv->is_master = 0;
 	mutex_unlock(&dev->struct_mutex);

trunk/include/drm/drmP.h

@@ -774,6 +774,15 @@ struct drm_driver {
 	/* Master routines */
 	int (*master_create)(struct drm_device *dev, struct drm_master *master);
 	void (*master_destroy)(struct drm_device *dev, struct drm_master *master);
+	/**
+	 * master_set is called whenever the minor master is set.
+	 * master_drop is called whenever the minor master is dropped.
+	 */
+
+	int (*master_set)(struct drm_device *dev, struct drm_file *file_priv,
+			  bool from_open);
+	void (*master_drop)(struct drm_device *dev, struct drm_file *file_priv,
+			    bool from_release);
 
 	int (*proc_init)(struct drm_minor *minor);
 	void (*proc_cleanup)(struct drm_minor *minor);