Re: [PATCH v5 2/6] drm/bridge: Add a devm_ allocator for panel bridge.

[Philippe CORNU]

On 07/18/2017 11:05 PM, Eric Anholt wrote:
> This will let drivers reduce the error cleanup they need, in
> particular the "is_panel_bridge" flag.
> 
> v2: Slight cleanup of remove function by Andrzej
> 
> Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>
> Reviewed-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx>

Reviewed-by: Philippe Cornu <philippe.cornu@xxxxxx>
Tested-by: Philippe Cornu <philippe.cornu@xxxxxx>

> ---
>   drivers/gpu/drm/bridge/panel.c | 30 ++++++++++++++++++++++++++++++
>   include/drm/drm_bridge.h       |  3 +++
>   2 files changed, 33 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
> index 685c1a480201..292ee92a9c97 100644
> --- a/drivers/gpu/drm/bridge/panel.c
> +++ b/drivers/gpu/drm/bridge/panel.c
> @@ -195,3 +195,33 @@ void drm_panel_bridge_remove(struct drm_bridge *bridge)
>   	devm_kfree(panel_bridge->panel->dev, bridge);
>   }
>   EXPORT_SYMBOL(drm_panel_bridge_remove);
> +
> +static void devm_drm_panel_bridge_release(struct device *dev, void *res)
> +{
> +	struct drm_bridge **bridge = res;
> +
> +	drm_panel_bridge_remove(*bridge);
> +}
> +
> +struct drm_bridge *devm_drm_panel_bridge_add(struct device *dev,
> +					     struct drm_panel *panel,
> +					     u32 connector_type)
> +{
> +	struct drm_bridge **ptr, *bridge;
> +
> +	ptr = devres_alloc(devm_drm_panel_bridge_release, sizeof(*ptr),
> +			   GFP_KERNEL);
> +	if (!ptr)
> +		return ERR_PTR(-ENOMEM);
> +
> +	bridge = drm_panel_bridge_add(panel, connector_type);
> +	if (!IS_ERR(bridge)) {
> +		*ptr = bridge;
> +		devres_add(dev, ptr);
> +	} else {
> +		devres_free(ptr);
> +	}
> +
> +	return bridge;
> +}
> +EXPORT_SYMBOL(devm_drm_panel_bridge_add);
> diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
> index 1dc94d5392e2..6522d4cbc9d9 100644
> --- a/include/drm/drm_bridge.h
> +++ b/include/drm/drm_bridge.h
> @@ -268,6 +268,9 @@ void drm_bridge_enable(struct drm_bridge *bridge);
>   struct drm_bridge *drm_panel_bridge_add(struct drm_panel *panel,
>   					u32 connector_type);
>   void drm_panel_bridge_remove(struct drm_bridge *bridge);
> +struct drm_bridge *devm_drm_panel_bridge_add(struct device *dev,
> +					     struct drm_panel *panel,
> +					     u32 connector_type);
>   #endif
>   
>   #endif
>