linux-kernel - Re: [PATCH v3 4/7] drivers: leds: Add the iEi WT61P803 PUZZLE LED driver

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Date:   Wed, 30 Sep 2020 21:48:00 +0200
From:   Pavel Machek <pavel@....cz>
To:     Luka Kovacic <luka.kovacic@...tura.hr>
Cc:     linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-leds@...r.kernel.org,
        lee.jones@...aro.org, dmurphy@...com, robh+dt@...nel.org,
        jdelvare@...e.com, linux@...ck-us.net, andrew@...n.ch,
        jason@...edaemon.net, gregory.clement@...tlin.com,
        marek.behun@....cz, luka.perkov@...tura.hr, robert.marko@...tura.hr
Subject: Re: [PATCH v3 4/7] drivers: leds: Add the iEi WT61P803 PUZZLE LED
 driver

Hi!

> +static int iei_wt61p803_puzzle_led_brightness_set_blocking(struct led_classdev *cdev,
> +		enum led_brightness brightness)
> +{
> +	struct iei_wt61p803_puzzle_led *priv = cdev_to_iei_wt61p803_puzzle_led(cdev);
> +	unsigned char *resp_buf = priv->response_buffer;
> +	unsigned char led_power_cmd[5] = {
> +		IEI_WT61P803_PUZZLE_CMD_HEADER_START,
> +		IEI_WT61P803_PUZZLE_CMD_LED,
> +		IEI_WT61P803_PUZZLE_CMD_LED_POWER,
> +		(char)IEI_LED_OFF
> +	};
> +	size_t reply_size;
> +
> +	mutex_lock(&priv->lock);
> +	if (brightness == LED_OFF) {
> +		led_power_cmd[3] = (char)IEI_LED_OFF;
> +		priv->led_power_state = LED_OFF;
> +	} else {
> +		led_power_cmd[3] = (char)IEI_LED_ON;
> +		priv->led_power_state = LED_ON;
> +	}
> +	mutex_unlock(&priv->lock);
> +
> +	return iei_wt61p803_puzzle_write_command(priv->mcu, led_power_cmd,
> +			sizeof(led_power_cmd), resp_buf, &reply_size);
> +}

Is the mutex needed? If so, should it include the
iei_wt61p803_puzzle_write_command()? Does
iei_wt61p803_puzzle_write_command() have internal locking to prevent
two messages from being mingled?

Best regards,
									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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