linux-kernel - Re: [PATCH 07/11] leds: trigger: netdev: reject interval and device store for hw

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Message-ID: <ZFjdpncRYi2N0gGQ@pengutronix.de>
Date:   Mon, 8 May 2023 13:31:50 +0200
From:   Sascha Hauer <s.hauer@...gutronix.de>
To:     Christian Marangi <ansuelsmth@...il.com>
Cc:     Jonathan Corbet <corbet@....net>, Pavel Machek <pavel@....cz>,
        Lee Jones <lee@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH 07/11] leds: trigger: netdev: reject interval and device
 store for hw_control

Hi Christian,

On Thu, Apr 27, 2023 at 02:15:37AM +0200, Christian Marangi wrote:
> Reject interval and device store with hw_control enabled. They are
> currently not supported and MUST be empty with hw_control enabled.
> 
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> ---
>  drivers/leds/trigger/ledtrig-netdev.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/drivers/leds/trigger/ledtrig-netdev.c b/drivers/leds/trigger/ledtrig-netdev.c
> index 28c4465a2584..8cd876647a27 100644
> --- a/drivers/leds/trigger/ledtrig-netdev.c
> +++ b/drivers/leds/trigger/ledtrig-netdev.c
> @@ -248,6 +255,13 @@ static ssize_t interval_store(struct device *dev,
>  	unsigned long value;
>  	int ret;
>  
> +	mutex_lock(&trigger_data->lock);
> +
> +	if (trigger_data->hw_control) {
> +		size = -EINVAL;
> +		goto out;
> +	}
> +
>  	ret = kstrtoul(buf, 0, &value);
>  	if (ret)
>  		return ret;

You return with the mutex held here. You could do the kstrtoul() before
acquiring the mutex.

Sascha

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