Re: [PATCH v2 1/3] drm: Make the prime vmap/vunmap hooks optional.

[Daniel Vetter]

On Mon, Apr 23, 2018 at 05:46:08PM -0700, Eric Anholt wrote:
> Some drivers leave these unimplemented, so don't make them have
> unimplemented stubs.
> 
> Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>

Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>

> ---
>  drivers/gpu/drm/drm_prime.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
> index caf675e3e692..397b46b33739 100644
> --- a/drivers/gpu/drm/drm_prime.c
> +++ b/drivers/gpu/drm/drm_prime.c
> @@ -409,7 +409,10 @@ void *drm_gem_dmabuf_vmap(struct dma_buf *dma_buf)
>  	struct drm_gem_object *obj = dma_buf->priv;
>  	struct drm_device *dev = obj->dev;
>  
> -	return dev->driver->gem_prime_vmap(obj);
> +	if (dev->driver->gem_prime_vmap)
> +		return dev->driver->gem_prime_vmap(obj);
> +	else
> +		return NULL;
>  }
>  EXPORT_SYMBOL(drm_gem_dmabuf_vmap);
>  
> @@ -426,7 +429,8 @@ void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
>  	struct drm_gem_object *obj = dma_buf->priv;
>  	struct drm_device *dev = obj->dev;
>  
> -	dev->driver->gem_prime_vunmap(obj, vaddr);
> +	if (dev->driver->gem_prime_vunmap)
> +		dev->driver->gem_prime_vunmap(obj, vaddr);
>  }
>  EXPORT_SYMBOL(drm_gem_dmabuf_vunmap);
>  
> -- 
> 2.17.0
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch