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SubjectRe: [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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