linux-kernel - Re: [PATCH 6/8] drm: bridge: dw_hdmi: Remove cec_notifier

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Date: Mon, 24 Jun 2024 11:20:18 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Jonas Karlman <jonas@...boo.se>, Andrzej Hajda <andrzej.hajda@...el.com>,
 Robert Foss <rfoss@...nel.org>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
 Jernej Skrabec <jernej.skrabec@...il.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/8] drm: bridge: dw_hdmi: Remove cec_notifier_mutex

On 11/06/2024 17:50, Jonas Karlman wrote:
> With CEC phys addr invalidation moved away from the irq handler there is
> no longer a need for cec_notifier_mutex, remove it.
> 
> Signed-off-by: Jonas Karlman <jonas@...boo.se>
> ---
>   drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 11 +----------
>   1 file changed, 1 insertion(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index 0814ca181f04..256e00a97a9a 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -189,7 +189,6 @@ struct dw_hdmi {
>   	void (*enable_audio)(struct dw_hdmi *hdmi);
>   	void (*disable_audio)(struct dw_hdmi *hdmi);
>   
> -	struct mutex cec_notifier_mutex;
>   	struct cec_notifier *cec_notifier;
>   
>   	hdmi_codec_plugged_cb plugged_cb;
> @@ -2459,11 +2458,8 @@ dw_hdmi_connector_detect(struct drm_connector *connector, bool force)
>   
>   	status = dw_hdmi_detect(hdmi);
>   
> -	if (status == connector_status_disconnected) {
> -		mutex_lock(&hdmi->cec_notifier_mutex);
> +	if (status == connector_status_disconnected)
>   		cec_notifier_phys_addr_invalidate(hdmi->cec_notifier);
> -		mutex_unlock(&hdmi->cec_notifier_mutex);
> -	}
>   
>   	return status;
>   }
> @@ -2577,9 +2573,7 @@ static int dw_hdmi_connector_create(struct dw_hdmi *hdmi)
>   	if (!notifier)
>   		return -ENOMEM;
>   
> -	mutex_lock(&hdmi->cec_notifier_mutex);
>   	hdmi->cec_notifier = notifier;
> -	mutex_unlock(&hdmi->cec_notifier_mutex);
>   
>   	return 0;
>   }
> @@ -2877,10 +2871,8 @@ static void dw_hdmi_bridge_detach(struct drm_bridge *bridge)
>   {
>   	struct dw_hdmi *hdmi = bridge->driver_private;
>   
> -	mutex_lock(&hdmi->cec_notifier_mutex);
>   	cec_notifier_conn_unregister(hdmi->cec_notifier);
>   	hdmi->cec_notifier = NULL;
> -	mutex_unlock(&hdmi->cec_notifier_mutex);
>   }
>   
>   static enum drm_mode_status
> @@ -3303,7 +3295,6 @@ struct dw_hdmi *dw_hdmi_probe(struct platform_device *pdev,
>   
>   	mutex_init(&hdmi->mutex);
>   	mutex_init(&hdmi->audio_mutex);
> -	mutex_init(&hdmi->cec_notifier_mutex);
>   	spin_lock_init(&hdmi->audio_lock);
>   
>   	ret = dw_hdmi_parse_dt(hdmi);

Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>