Re: [PATCH 5/5] drm/vmwgfx: Nuke preclose hook

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LGTM.

Reviewed-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>


On 01/10/2016 11:26 PM, Daniel Vetter wrote:
> Again since the drm core takes care of event unlinking/disarming this
> is now just needless code.
>
> v2: I've completely missed eaction->fpriv_head and all the related
> code. We need to nuke that too to avoid accidentally deferencing the
> freed-up vmwgfx-private fpriv.
>
> v3: Also remove vmw_fpriv->fence_events and unused variables I missed.
>
> Cc: Thomas Hellström <thellstrom@xxxxxxxxxx>
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> ---
>  drivers/gpu/drm/vmwgfx/vmwgfx_drv.c   | 11 --------
>  drivers/gpu/drm/vmwgfx/vmwgfx_drv.h   |  1 -
>  drivers/gpu/drm/vmwgfx/vmwgfx_fence.c | 52 -----------------------------------
>  drivers/gpu/drm/vmwgfx/vmwgfx_fence.h |  2 --
>  4 files changed, 66 deletions(-)
>
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> index c49812b80dd0..c96a2d2d5107 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> @@ -971,15 +971,6 @@ static int vmw_driver_unload(struct drm_device *dev)
>  	return 0;
>  }
>  
> -static void vmw_preclose(struct drm_device *dev,
> -			 struct drm_file *file_priv)
> -{
> -	struct vmw_fpriv *vmw_fp = vmw_fpriv(file_priv);
> -	struct vmw_private *dev_priv = vmw_priv(dev);
> -
> -	vmw_event_fence_fpriv_gone(dev_priv->fman, &vmw_fp->fence_events);
> -}
> -
>  static void vmw_postclose(struct drm_device *dev,
>  			 struct drm_file *file_priv)
>  {
> @@ -1010,7 +1001,6 @@ static int vmw_driver_open(struct drm_device *dev, struct drm_file *file_priv)
>  	if (unlikely(vmw_fp == NULL))
>  		return ret;
>  
> -	INIT_LIST_HEAD(&vmw_fp->fence_events);
>  	vmw_fp->tfile = ttm_object_file_init(dev_priv->tdev, 10);
>  	if (unlikely(vmw_fp->tfile == NULL))
>  		goto out_no_tfile;
> @@ -1500,7 +1490,6 @@ static struct drm_driver driver = {
>  	.master_set = vmw_master_set,
>  	.master_drop = vmw_master_drop,
>  	.open = vmw_driver_open,
> -	.preclose = vmw_preclose,
>  	.postclose = vmw_postclose,
>  	.set_busid = drm_pci_set_busid,
>  
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
> index 469cdd520615..5cb1b1687cd4 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
> @@ -80,7 +80,6 @@
>  struct vmw_fpriv {
>  	struct drm_master *locked_master;
>  	struct ttm_object_file *tfile;
> -	struct list_head fence_events;
>  	bool gb_aware;
>  };
>  
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c b/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c
> index e0edf149d9d5..ac477863fc07 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c
> @@ -71,7 +71,6 @@ struct vmw_user_fence {
>   */
>  struct vmw_event_fence_action {
>  	struct vmw_fence_action action;
> -	struct list_head fpriv_head;
>  
>  	struct drm_pending_event *event;
>  	struct vmw_fence_obj *fence;
> @@ -808,44 +807,6 @@ int vmw_fence_obj_unref_ioctl(struct drm_device *dev, void *data,
>  }
>  
>  /**
> - * vmw_event_fence_fpriv_gone - Remove references to struct drm_file objects
> - *
> - * @fman: Pointer to a struct vmw_fence_manager
> - * @event_list: Pointer to linked list of struct vmw_event_fence_action objects
> - * with pointers to a struct drm_file object about to be closed.
> - *
> - * This function removes all pending fence events with references to a
> - * specific struct drm_file object about to be closed. The caller is required
> - * to pass a list of all struct vmw_event_fence_action objects with such
> - * events attached. This function is typically called before the
> - * struct drm_file object's event management is taken down.
> - */
> -void vmw_event_fence_fpriv_gone(struct vmw_fence_manager *fman,
> -				struct list_head *event_list)
> -{
> -	struct vmw_event_fence_action *eaction;
> -	struct drm_pending_event *event;
> -	unsigned long irq_flags;
> -
> -	while (1) {
> -		spin_lock_irqsave(&fman->lock, irq_flags);
> -		if (list_empty(event_list))
> -			goto out_unlock;
> -		eaction = list_first_entry(event_list,
> -					   struct vmw_event_fence_action,
> -					   fpriv_head);
> -		list_del_init(&eaction->fpriv_head);
> -		event = eaction->event;
> -		eaction->event = NULL;
> -		spin_unlock_irqrestore(&fman->lock, irq_flags);
> -		event->destroy(event);
> -	}
> -out_unlock:
> -	spin_unlock_irqrestore(&fman->lock, irq_flags);
> -}
> -
> -
> -/**
>   * vmw_event_fence_action_seq_passed
>   *
>   * @action: The struct vmw_fence_action embedded in a struct
> @@ -879,7 +840,6 @@ static void vmw_event_fence_action_seq_passed(struct vmw_fence_action *action)
>  		*eaction->tv_usec = tv.tv_usec;
>  	}
>  
> -	list_del_init(&eaction->fpriv_head);
>  	eaction->event = NULL;
>  	drm_send_event_locked(dev, eaction->event);
>  	spin_unlock_irqrestore(&dev->event_lock, irq_flags);
> @@ -898,12 +858,6 @@ static void vmw_event_fence_action_cleanup(struct vmw_fence_action *action)
>  {
>  	struct vmw_event_fence_action *eaction =
>  		container_of(action, struct vmw_event_fence_action, action);
> -	struct vmw_fence_manager *fman = fman_from_fence(eaction->fence);
> -	unsigned long irq_flags;
> -
> -	spin_lock_irqsave(&fman->lock, irq_flags);
> -	list_del(&eaction->fpriv_head);
> -	spin_unlock_irqrestore(&fman->lock, irq_flags);
>  
>  	vmw_fence_obj_unreference(&eaction->fence);
>  	kfree(eaction);
> @@ -983,8 +937,6 @@ int vmw_event_fence_action_queue(struct drm_file *file_priv,
>  {
>  	struct vmw_event_fence_action *eaction;
>  	struct vmw_fence_manager *fman = fman_from_fence(fence);
> -	struct vmw_fpriv *vmw_fp = vmw_fpriv(file_priv);
> -	unsigned long irq_flags;
>  
>  	eaction = kzalloc(sizeof(*eaction), GFP_KERNEL);
>  	if (unlikely(eaction == NULL))
> @@ -1001,10 +953,6 @@ int vmw_event_fence_action_queue(struct drm_file *file_priv,
>  	eaction->tv_sec = tv_sec;
>  	eaction->tv_usec = tv_usec;
>  
> -	spin_lock_irqsave(&fman->lock, irq_flags);
> -	list_add_tail(&eaction->fpriv_head, &vmw_fp->fence_events);
> -	spin_unlock_irqrestore(&fman->lock, irq_flags);
> -
>  	vmw_fence_obj_add_action(fence, &eaction->action);
>  
>  	return 0;
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fence.h b/drivers/gpu/drm/vmwgfx/vmwgfx_fence.h
> index 8be6c29f5eb5..83ae301ee141 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_fence.h
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fence.h
> @@ -116,8 +116,6 @@ extern int vmw_fence_obj_unref_ioctl(struct drm_device *dev, void *data,
>  				     struct drm_file *file_priv);
>  extern int vmw_fence_event_ioctl(struct drm_device *dev, void *data,
>  				 struct drm_file *file_priv);
> -extern void vmw_event_fence_fpriv_gone(struct vmw_fence_manager *fman,
> -				       struct list_head *event_list);
>  extern int vmw_event_fence_action_queue(struct drm_file *filee_priv,
>  					struct vmw_fence_obj *fence,
>  					struct drm_pending_event *event,

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