[PATCH] drm: Move vblank cleanup from unregister to release

[Lucas Stach]

Am Mittwoch, den 14.12.2016, 12:48 +0200 schrieb Laurent Pinchart:
> Calling drm_vblank_cleanup() in drm_dev_unregister() causes issues with
> drivers that have moved away from the .load() and .unload() midlayer.
> Those drivers call drm_dev_unregister() as the first operation at unbind
> time, before shutting down the device. This results in warnings due to
> drm_vblank_cleanup() being called with vblank interrupts still active,
> and then to vblank events being sent after cleanup.
> 
> Fix the problem by moving vblank cleanup from drm_dev_unregister() to
> drm_dev_release() that is guaranteed to be called after drivers shut
> down the device.
> 
> Suggested-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>

Reviewed-by: Lucas Stach <l.stach at pengutronix.de>

> ---
>  drivers/gpu/drm/drm_drv.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> Tomi, this fixes the rmmod issue you've reported in response to
> "[PATCH v4 00/22] OMAP DRM fixes and improvements".
> 
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index a525751b4559..a899daf54ac3 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -595,6 +595,8 @@ static void drm_dev_release(struct kref *ref)
>  {
>  	struct drm_device *dev = container_of(ref, struct drm_device, ref);
>  
> +	drm_vblank_cleanup(dev);
> +
>  	if (drm_core_check_feature(dev, DRIVER_GEM))
>  		drm_gem_destroy(dev);
>  
> @@ -794,8 +796,6 @@ void drm_dev_unregister(struct drm_device *dev)
>  	if (dev->agp)
>  		drm_pci_agp_destroy(dev);
>  
> -	drm_vblank_cleanup(dev);
> -
>  	list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
>  		drm_legacy_rmmap(dev, r_list->map);
>