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Commit dda9cd9f authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 

* 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6:
  drm: don't drop handle reference on unload
  drm/ttm: Fix two race conditions + fix busy codepaths
parents afe14746 dab8dcfa

drivers/gpu/drm/i915/intel_fb.c

+1 −1
Original line number Diff line number Diff line
@@ -238,8 +238,8 @@ int intel_fbdev_destroy(struct drm_device *dev, 


	drm_framebuffer_cleanup(&ifb->base);

	if (ifb->obj) {

		drm_gem_object_handle_unreference(ifb->obj);

		drm_gem_object_unreference(ifb->obj);

		ifb->obj = NULL;

	}



	return 0;

drivers/gpu/drm/nouveau/nouveau_fbcon.c

+0 −1
Original line number Diff line number Diff line
@@ -352,7 +352,6 @@ nouveau_fbcon_destroy(struct drm_device *dev, struct nouveau_fbdev *nfbdev) 


	if (nouveau_fb->nvbo) {

		nouveau_bo_unmap(nouveau_fb->nvbo);

		drm_gem_object_handle_unreference_unlocked(nouveau_fb->nvbo->gem);

		drm_gem_object_unreference_unlocked(nouveau_fb->nvbo->gem);

		nouveau_fb->nvbo = NULL;

	}

drivers/gpu/drm/nouveau/nouveau_notifier.c

+0 −1
Original line number Diff line number Diff line
@@ -79,7 +79,6 @@ nouveau_notifier_takedown_channel(struct nouveau_channel *chan) 
	mutex_lock(&dev->struct_mutex);

	nouveau_bo_unpin(chan->notifier_bo);

	mutex_unlock(&dev->struct_mutex);

	drm_gem_object_handle_unreference_unlocked(chan->notifier_bo->gem);

	drm_gem_object_unreference_unlocked(chan->notifier_bo->gem);

	drm_mm_takedown(&chan->notifier_heap);

}

drivers/gpu/drm/radeon/radeon_fb.c

+0 −1
Original line number Diff line number Diff line
@@ -97,7 +97,6 @@ static void radeonfb_destroy_pinned_object(struct drm_gem_object *gobj) 
		radeon_bo_unpin(rbo);

		radeon_bo_unreserve(rbo);

	}

	drm_gem_object_handle_unreference(gobj);

	drm_gem_object_unreference_unlocked(gobj);

}

drivers/gpu/drm/ttm/ttm_bo.c

+71 −12
Original line number Diff line number Diff line
@@ -441,6 +441,43 @@ static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo, 
	return ret;

}



/**

 * Call bo::reserved and with the lru lock held.

 * Will release GPU memory type usage on destruction.

 * This is the place to put in driver specific hooks.

 * Will release the bo::reserved lock and the

 * lru lock on exit.

 */



static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)

{

	struct ttm_bo_global *glob = bo->glob;



	if (bo->ttm) {



		/**

		 * Release the lru_lock, since we don't want to have

		 * an atomic requirement on ttm_tt[unbind|destroy].

		 */



		spin_unlock(&glob->lru_lock);

		ttm_tt_unbind(bo->ttm);

		ttm_tt_destroy(bo->ttm);

		bo->ttm = NULL;

		spin_lock(&glob->lru_lock);

	}



	if (bo->mem.mm_node) {

		drm_mm_put_block(bo->mem.mm_node);

		bo->mem.mm_node = NULL;

	}



	atomic_set(&bo->reserved, 0);

	wake_up_all(&bo->event_queue);

	spin_unlock(&glob->lru_lock);

}





/**

 * If bo idle, remove from delayed- and lru lists, and unref.

 * If not idle, and already on delayed list, do nothing.
@@ -456,6 +493,7 @@ static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all) 
	int ret;



	spin_lock(&bo->lock);

retry:

	(void) ttm_bo_wait(bo, false, false, !remove_all);



	if (!bo->sync_obj) {
@@ -464,31 +502,52 @@ static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all) 
		spin_unlock(&bo->lock);



		spin_lock(&glob->lru_lock);

		put_count = ttm_bo_del_from_lru(bo);

		ret = ttm_bo_reserve_locked(bo, false, !remove_all, false, 0);



		ret = ttm_bo_reserve_locked(bo, false, false, false, 0);

		BUG_ON(ret);

		if (bo->ttm)

			ttm_tt_unbind(bo->ttm);

		/**

		 * Someone else has the object reserved. Bail and retry.

		 */



		if (unlikely(ret == -EBUSY)) {

			spin_unlock(&glob->lru_lock);

			spin_lock(&bo->lock);

			goto requeue;

		}



		/**

		 * We can re-check for sync object without taking

		 * the bo::lock since setting the sync object requires

		 * also bo::reserved. A busy object at this point may

		 * be caused by another thread starting an accelerated

		 * eviction.

		 */



		if (unlikely(bo->sync_obj)) {

			atomic_set(&bo->reserved, 0);

			wake_up_all(&bo->event_queue);

			spin_unlock(&glob->lru_lock);

			spin_lock(&bo->lock);

			if (remove_all)

				goto retry;

			else

				goto requeue;

		}



		put_count = ttm_bo_del_from_lru(bo);



		if (!list_empty(&bo->ddestroy)) {

			list_del_init(&bo->ddestroy);

			++put_count;

		}

		if (bo->mem.mm_node) {

			drm_mm_put_block(bo->mem.mm_node);

			bo->mem.mm_node = NULL;

		}

		spin_unlock(&glob->lru_lock);



		atomic_set(&bo->reserved, 0);

		ttm_bo_cleanup_memtype_use(bo);



		while (put_count--)

			kref_put(&bo->list_kref, ttm_bo_ref_bug);



		return 0;

	}



requeue:

	spin_lock(&glob->lru_lock);

	if (list_empty(&bo->ddestroy)) {

		void *sync_obj = bo->sync_obj;