[PATCH] drm/vmwgfx: Nuke preclose hook

[Thomas Hellstrom]

In general, looks good. Two things though.

1) vc4_drv.h looks like it ended up in the wrong patch.
2) Should be able to nuke also struct vmw_fpriv::fence_events and struct
vmw_event_fence_action::fpriv_head?

/Thomas

On 01/10/2016 11:02 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.
>
> Cc: Thomas Hellström <thellstrom at vmware.com>
> Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
> ---
>  drivers/gpu/drm/vc4/vc4_drv.h         |  1 -
>  drivers/gpu/drm/vmwgfx/vmwgfx_drv.c   | 10 --------
>  drivers/gpu/drm/vmwgfx/vmwgfx_fence.c | 48 -----------------------------------
>  drivers/gpu/drm/vmwgfx/vmwgfx_fence.h |  2 --
>  4 files changed, 61 deletions(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
> index 080865ec2bae..4c734d087d7f 100644
> --- a/drivers/gpu/drm/vc4/vc4_drv.h
> +++ b/drivers/gpu/drm/vc4/vc4_drv.h
> @@ -376,7 +376,6 @@ int vc4_bo_stats_debugfs(struct seq_file *m, void *arg);
>  extern struct platform_driver vc4_crtc_driver;
>  int vc4_enable_vblank(struct drm_device *dev, unsigned int crtc_id);
>  void vc4_disable_vblank(struct drm_device *dev, unsigned int crtc_id);
> -void vc4_cancel_page_flip(struct drm_crtc *crtc, struct drm_file *file);
>  int vc4_crtc_debugfs_regs(struct seq_file *m, void *arg);
>  
>  /* vc4_debugfs.c */
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> index c49812b80dd0..c04c4d1e2f3e 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)
>  {
> @@ -1500,7 +1491,6 @@ 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_fence.c b/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c
> index e0edf149d9d5..bb95bd20d415 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);
> @@ -901,10 +861,6 @@ static void vmw_event_fence_action_cleanup(struct vmw_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);
>  }
> @@ -1001,10 +957,6 @@ 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,