From abc896638fdcd8ccb457ad7b43dbe7ad229ba501 Mon Sep 17 00:00:00 2001
From: Keith Packard <keithp@keithp.com>
Date: Thu, 1 May 2008 20:12:39 -0700
Subject: Use krefs for refcounting.

krefs are way easier than a custom-coded spinlock+int combo.
---
 linux-core/drm_gem.c | 31 +++++++++++++++++--------------
 1 file changed, 17 insertions(+), 14 deletions(-)

(limited to 'linux-core/drm_gem.c')

diff --git a/linux-core/drm_gem.c b/linux-core/drm_gem.c
index ee3dbe47..d39585e9 100644
--- a/linux-core/drm_gem.c
+++ b/linux-core/drm_gem.c
@@ -73,13 +73,14 @@ drm_gem_object_alloc(struct drm_device *dev, size_t size)
 
 	obj = kcalloc(1, sizeof(*obj), GFP_KERNEL);
 
+	obj->dev = dev;
 	obj->filp = shmem_file_setup("drm mm object", size, 0);
 	if (IS_ERR(obj->filp)) {
 		kfree(obj);
 		return NULL;
 	}
 
-	obj->refcount = 1;
+	kref_init (&obj->refcount);
 	obj->size = size;
 
 	if (dev->driver->gem_init_object != NULL &&
@@ -352,27 +353,29 @@ drm_gem_release(struct drm_device *dev, struct drm_file *file_private)
 void
 drm_gem_object_reference(struct drm_device *dev, struct drm_gem_object *obj)
 {
-	spin_lock(&obj->lock);
-	obj->refcount++;
-	spin_unlock(&obj->lock);
+	kref_get(&obj->refcount);
 }
 EXPORT_SYMBOL(drm_gem_object_reference);
 
+static void
+drm_gem_object_free (struct kref *kref)
+{
+	struct drm_gem_object *obj = (struct drm_gem_object *) kref;
+	struct drm_device *dev = obj->dev;
+
+	if (dev->driver->gem_free_object != NULL)
+		dev->driver->gem_free_object(dev, obj);
+
+	fput(obj->filp);
+	kfree(obj);
+}
+
 void
 drm_gem_object_unreference(struct drm_device *dev, struct drm_gem_object *obj)
 {
 	if (obj == NULL)
 		return;
 
-	spin_lock(&obj->lock);
-	obj->refcount--;
-	spin_unlock(&obj->lock);
-	if (obj->refcount == 0) {
-		if (dev->driver->gem_free_object != NULL)
-			dev->driver->gem_free_object(dev, obj);
-
-		fput(obj->filp);
-		kfree(obj);
-	}
+	kref_put (&obj->refcount, drm_gem_object_free);
 }
 EXPORT_SYMBOL(drm_gem_object_unreference);
-- 
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