[PATCH 4/6] Revert "drm/ttm: use a static ttm_bo_global instance"

[Karol Herbst <kherbst@redhat.com>]

This reverts commit 62b53b37e4b1500d4eb4624a44ad861cf8d3cd18.

Signed-off-by: Karol Herbst <kherbst@redhat.com>
---
 drivers/gpu/drm/ttm/ttm_bo.c    | 31 ++++++++-----------------------
 include/drm/ttm/ttm_bo_driver.h | 15 +++++++--------
 2 files changed, 15 insertions(+), 31 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 6941562ef2fa..c0efe4c89baf 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -49,9 +49,6 @@ static void ttm_bo_global_kobj_release(struct kobject *kobj);
  * ttm_global_mutex - protecting the global BO state
  */
 DEFINE_MUTEX(ttm_global_mutex);
-struct ttm_bo_global ttm_bo_glob = {
-	.use_count = 0
-};
 
 static struct attribute ttm_bo_count = {
 	.name = "bo_count",
@@ -1531,35 +1528,22 @@ static void ttm_bo_global_kobj_release(struct kobject *kobj)
 	kfree(glob);
 }
 
-void ttm_bo_global_release(void)
+void ttm_bo_global_release(struct ttm_bo_global *glob)
 {
-	struct ttm_bo_global *glob = &ttm_bo_glob;
-
-	mutex_lock(&ttm_global_mutex);
-	if (--glob->use_count > 0)
-		goto out;
-
 	kobject_del(&glob->kobj);
 	kobject_put(&glob->kobj);
 	ttm_mem_global_release(&ttm_mem_glob);
-out:
-	mutex_unlock(&ttm_global_mutex);
 }
 EXPORT_SYMBOL(ttm_bo_global_release);
 
-int ttm_bo_global_init(void)
+int ttm_bo_global_init(struct ttm_bo_global *glob)
 {
-	struct ttm_bo_global *glob = &ttm_bo_glob;
-	int ret = 0;
+	int ret;
 	unsigned i;
 
-	mutex_lock(&ttm_global_mutex);
-	if (++glob->use_count > 1)
-		goto out;
-
 	ret = ttm_mem_global_init(&ttm_mem_glob);
 	if (ret)
-		goto out;
+		return ret;
 
 	spin_lock_init(&glob->lru_lock);
 	glob->mem_glob = &ttm_mem_glob;
@@ -1568,7 +1552,7 @@ int ttm_bo_global_init(void)
 
 	if (unlikely(glob->dummy_read_page == NULL)) {
 		ret = -ENOMEM;
-		goto out;
+		goto out_no_drp;
 	}
 
 	for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
@@ -1580,8 +1564,9 @@ int ttm_bo_global_init(void)
 		&glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
 	if (unlikely(ret != 0))
 		kobject_put(&glob->kobj);
-out:
-	mutex_unlock(&ttm_global_mutex);
+	return ret;
+out_no_drp:
+	kfree(glob);
 	return ret;
 }
 EXPORT_SYMBOL(ttm_bo_global_init);
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 26be74939f10..9cec8835b88f 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -398,7 +398,7 @@ struct ttm_bo_driver {
  * @swap_lru: Lru list of buffer objects used for swapping.
  */
 
-extern struct ttm_bo_global {
+struct ttm_bo_global {
 
 	/**
 	 * Constant after init.
@@ -410,9 +410,8 @@ extern struct ttm_bo_global {
 	spinlock_t lru_lock;
 
 	/**
-	 * Protected by ttm_global_mutex.
+	 * Protected by device_list_mutex.
 	 */
-	unsigned int use_count;
 	struct list_head device_list;
 
 	/**
@@ -424,7 +423,7 @@ extern struct ttm_bo_global {
 	 * Internal protection.
 	 */
 	atomic_t bo_count;
-} ttm_bo_glob;
+};
 
 
 #define TTM_NUM_MEM_TYPES 8
@@ -569,8 +568,8 @@ void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem);
 void ttm_bo_mem_put_locked(struct ttm_buffer_object *bo,
 			   struct ttm_mem_reg *mem);
 
-void ttm_bo_global_release(void);
-int ttm_bo_global_init(void);
+void ttm_bo_global_release(struct ttm_bo_global *glob);
+int ttm_bo_global_init(struct ttm_bo_global *glob);
 
 int ttm_bo_device_release(struct ttm_bo_device *bdev);
 
@@ -907,7 +906,7 @@ struct ttm_bo_global_ref {
  */
 static inline int ttm_bo_global_ref_init(struct drm_global_reference *ref)
 {
-	return ttm_bo_global_init();
+	return ttm_bo_global_init(ref->object);
 }
 
 /**
@@ -921,7 +920,7 @@ static inline int ttm_bo_global_ref_init(struct drm_global_reference *ref)
  */
 static inline void ttm_bo_global_ref_release(struct drm_global_reference *ref)
 {
-	ttm_bo_global_release();
+	ttm_bo_global_release(ref->object);
 }
 
 #endif
-- 
2.20.1

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