[Intel-gfx] [PATCH 07/14] drm: Only do the hw.lock cleanup in master_relase for !MODESET

[Daniel Vetter]

Another place gone where modern drivers could have hit
dev->struct_mutex.

To avoid too deeply nesting control flow rework it a bit.

Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
---
 drivers/gpu/drm/drm_auth.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/drm_auth.c b/drivers/gpu/drm/drm_auth.c
index e015a7edb154..a58b2eb0d004 100644
--- a/drivers/gpu/drm/drm_auth.c
+++ b/drivers/gpu/drm/drm_auth.c
@@ -246,11 +246,14 @@ int drm_master_open(struct drm_file *file_priv)
 void drm_master_release(struct drm_file *file_priv)
 {
 	struct drm_device *dev = file_priv->minor->dev;
+	struct drm_master *master = file_priv->master;
+
 
 	mutex_lock(&dev->master_mutex);
-	if (file_priv->is_master) {
-		struct drm_master *master = file_priv->master;
+	if (!file_priv->is_master)
+		goto out_unlock;
 
+	if (!drm_core_check_feature(dev, DRIVER_MODESET)) {
 		/*
 		 * Since the master is disappearing, so is the
 		 * possibility to lock.
@@ -264,19 +267,20 @@ void drm_master_release(struct drm_file *file_priv)
 			wake_up_interruptible_all(&master->lock.lock_queue);
 		}
 		mutex_unlock(&dev->struct_mutex);
+	}
 
-		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);
-		}
+	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);
 	}
 
 	/* drop the master reference held by the file priv */
 	if (file_priv->master)
 		drm_master_put(&file_priv->master);
 	file_priv->is_master = 0;
+out_unlock:
 	mutex_unlock(&dev->master_mutex);
 }
 
-- 
2.8.1