[PATCH v4 20/23] drm/msm: Remove msm_gem_free_work

[Rob Clark]

From: Rob Clark <robdclark at chromium.org>

Now that we don't need struct_mutex in the free path, we can get rid of
the asynchronous free altogether.

Signed-off-by: Rob Clark <robdclark at chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg at google.com>
---
 drivers/gpu/drm/msm/msm_drv.c |  3 ---
 drivers/gpu/drm/msm/msm_drv.h |  5 -----
 drivers/gpu/drm/msm/msm_gem.c | 27 ---------------------------
 drivers/gpu/drm/msm/msm_gem.h |  1 -
 4 files changed, 36 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 81cb2cecc829..49e6daf30b42 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -438,9 +438,6 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
 
 	priv->wq = alloc_ordered_workqueue("msm", 0);
 
-	INIT_WORK(&priv->free_work, msm_gem_free_work);
-	init_llist_head(&priv->free_list);
-
 	INIT_LIST_HEAD(&priv->inactive_list);
 	mutex_init(&priv->mm_lock);
 
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index 2ef5cff19883..af296712eae8 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -188,10 +188,6 @@ struct msm_drm_private {
 	struct list_head inactive_list;
 	struct mutex mm_lock;
 
-	/* worker for delayed free of objects: */
-	struct work_struct free_work;
-	struct llist_head free_list;
-
 	struct workqueue_struct *wq;
 
 	unsigned int num_planes;
@@ -291,7 +287,6 @@ struct drm_gem_object *msm_gem_prime_import_sg_table(struct drm_device *dev,
 		struct dma_buf_attachment *attach, struct sg_table *sg);
 int msm_gem_prime_pin(struct drm_gem_object *obj);
 void msm_gem_prime_unpin(struct drm_gem_object *obj);
-void msm_gem_free_work(struct work_struct *work);
 
 int msm_framebuffer_prepare(struct drm_framebuffer *fb,
 		struct msm_gem_address_space *aspace);
diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 5d555750943e..00b4788366c5 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -939,16 +939,6 @@ void msm_gem_free_object(struct drm_gem_object *obj)
 	struct drm_device *dev = obj->dev;
 	struct msm_drm_private *priv = dev->dev_private;
 
-	if (llist_add(&msm_obj->freed, &priv->free_list))
-		queue_work(priv->wq, &priv->free_work);
-}
-
-static void free_object(struct msm_gem_object *msm_obj)
-{
-	struct drm_gem_object *obj = &msm_obj->base;
-	struct drm_device *dev = obj->dev;
-	struct msm_drm_private *priv = dev->dev_private;
-
 	/* object should not be on active list: */
 	WARN_ON(is_active(msm_obj));
 
@@ -986,23 +976,6 @@ static void free_object(struct msm_gem_object *msm_obj)
 	kfree(msm_obj);
 }
 
-void msm_gem_free_work(struct work_struct *work)
-{
-	struct msm_drm_private *priv =
-		container_of(work, struct msm_drm_private, free_work);
-	struct llist_node *freed;
-	struct msm_gem_object *msm_obj, *next;
-
-	while ((freed = llist_del_all(&priv->free_list))) {
-		llist_for_each_entry_safe(msm_obj, next,
-					  freed, freed)
-			free_object(msm_obj);
-
-		if (need_resched())
-			break;
-	}
-}
-
 /* convenience method to construct a GEM buffer object, and userspace handle */
 int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
 		uint32_t size, uint32_t flags, uint32_t *handle,
diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h
index f4e73c6f07bf..ffa2130ee97d 100644
--- a/drivers/gpu/drm/msm/msm_gem.h
+++ b/drivers/gpu/drm/msm/msm_gem.h
@@ -204,7 +204,6 @@ static inline bool is_vunmapable(struct msm_gem_object *msm_obj)
 
 void msm_gem_purge(struct drm_gem_object *obj);
 void msm_gem_vunmap(struct drm_gem_object *obj);
-void msm_gem_free_work(struct work_struct *work);
 
 /* Created per submit-ioctl, to track bo's and cmdstream bufs, etc,
  * associated with the cmdstream submission for synchronization (and
-- 
2.26.2