linux-kernel - Re: [PATCH 4/8] drm/bridge: Add a devm

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Date:   Thu, 29 Jun 2017 11:30:42 +0200
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Eric Anholt <eric@...olt.net>, dri-devel@...ts.freedesktop.org,
        Archit Taneja <architt@...eaurora.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Thierry Reding <thierry.reding@...il.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/8] drm/bridge: Add a devm_ allocator for panel bridge.

On 27.06.2017 21:58, Eric Anholt wrote:
> This will let drivers reduce the error cleanup they need, in
> particular the "is_panel_bridge" flag.
>
> Signed-off-by: Eric Anholt <eric@...olt.net>
> ---
>  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 67fe19e5a9c6..cdf367d2653a 100644
> --- a/drivers/gpu/drm/bridge/panel.c
> +++ b/drivers/gpu/drm/bridge/panel.c
> @@ -198,3 +198,33 @@ 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 = *(struct drm_bridge **)res;
> +
> +	drm_panel_bridge_remove(bridge);

I guess more elegant would be:
    struct drm_bridge **bridge = res;

    drm_panel_bridge_remove(*bridge);


I am still not convinced to the idea of this panel_bridge stuff, but
this is different issue :)

Anyway:
Reviewed-by: Andrzej Hajda <a.hajda@...sung.com>

 --
Regards
Andrzej

> +}
> +
> +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