linux-kernel - Re: [PATCH 1/4] ASoC: hdmi-codec: Add an op to set callback function for plug event

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Date:   Tue, 9 Jul 2019 13:47:10 +0200
From:   Cezary Rojewski <cezary.rojewski@...el.com>
To:     Cheng-Yi Chiang <cychiang@...omium.org>
Cc:     linux-kernel@...r.kernel.org, Hans Verkuil <hverkuil@...all.nl>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Takashi Iwai <tiwai@...e.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Heiko Stuebner <heiko@...ech.de>, dianders@...omium.org,
        dgreid@...omium.org, tzungbi@...omium.org,
        alsa-devel@...a-project.org, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH 1/4] ASoC: hdmi-codec: Add an op to set callback function
 for plug event

On 2019-07-05 06:26, Cheng-Yi Chiang wrote:
> +static void hdmi_codec_jack_report(struct hdmi_codec_priv *hcp,
> +				   unsigned int jack_status)
> +{
> +	if (!hcp->jack)
> +		return;
> +
> +	if (jack_status != hcp->jack_status) {
> +		snd_soc_jack_report(hcp->jack, jack_status, SND_JACK_LINEOUT);
> +		hcp->jack_status = jack_status;
> +	}
> +}

Single "if" statement instead? The first "if" does not even cover all 
cases - if the secondary check fails, you'll "return;" too.

> +/**
> + * hdmi_codec_set_jack_detect - register HDMI plugged callback
> + * @component: the hdmi-codec instance
> + * @jack: ASoC jack to report (dis)connection events on
> + */
> +int hdmi_codec_set_jack_detect(struct snd_soc_component *component,
> +			       struct snd_soc_jack *jack)
> +{
> +	struct hdmi_codec_priv *hcp = snd_soc_component_get_drvdata(component);
> +	int ret;
> +
> +	if (hcp->hcd.ops->hook_plugged_cb) {
> +		hcp->jack = jack;
> +		ret = hcp->hcd.ops->hook_plugged_cb(component->dev->parent,
> +						    hcp->hcd.data,
> +						    plugged_cb);
> +		if (ret) {
> +			hcp->jack = NULL;
> +			return ret;
> +		}
> +		return 0;
> +	}
> +	return -EOPNOTSUPP;
> +}
> +EXPORT_SYMBOL_GPL(hdmi_codec_set_jack_detect);

int ret = -EOPNOTSUPP;
(...)

return ret;

In consequence, you can reduce the number of "return(s)" and also remove 
the redundant parenthesis for the if-statement used to set jack to NULL.

Czarek