linux-kernel - Re: [PATCH 3/5] leds: lm3692x: Handle failure to probe the regulator

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Message-ID: <4bde1b54-bdc5-8aa8-d10b-0cc131ef7673@ti.com>
Date:   Wed, 18 Sep 2019 13:41:23 -0500
From:   Dan Murphy <dmurphy@...com>
To:     Guido Günther <agx@...xcpu.org>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, <linux-leds@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] leds: lm3692x: Handle failure to probe the regulator

Guido

On 9/17/19 9:19 PM, Guido Günther wrote:
> Instead use devm_regulator_get_optional since the regulator
> is optional and check for errors.
>
> Signed-off-by: Guido Günther <agx@...xcpu.org>
> ---
>   drivers/leds/leds-lm3692x.c | 11 ++++++++---
>   1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/leds/leds-lm3692x.c b/drivers/leds/leds-lm3692x.c
> index f394669ad8f2..9972c932d51e 100644
> --- a/drivers/leds/leds-lm3692x.c
> +++ b/drivers/leds/leds-lm3692x.c
> @@ -333,9 +333,14 @@ static int lm3692x_probe_dt(struct lm3692x_led *led)
>   		return ret;
>   	}
>   
> -	led->regulator = devm_regulator_get(&led->client->dev, "vled");
> -	if (IS_ERR(led->regulator))
> -		led->regulator = NULL;
> +	led->regulator = devm_regulator_get_optional(&led->client->dev, "vled");
> +	if (IS_ERR(led->regulator)) {
> +		ret = PTR_ERR(led->regulator);
> +		if (ret != -EPROBE_DEFER)
> +			dev_err(&led->client->dev,
> +				"Failed to get vled regulator: %d\n", ret);
nitpick. Add a new line for readability
> +		return ret;
> +	}

If the regulator is not set then led->regulator should be set to NULL.

Dan


>   
>   	child = device_get_next_child_node(&led->client->dev, child);
>   	if (!child) {