linux-kernel - Re: [PATCH 1/3] dev_pm_qos: Improve sysfs pm_qos_latency

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Message-ID: <20161205111924.GA9148@amd>
Date:   Mon, 5 Dec 2016 12:19:24 +0100
From:   Pavel Machek <pavel@....cz>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH 1/3] dev_pm_qos: Improve sysfs pm_qos_latency_tolerance
 validation

On Tue 2016-11-29 17:11:50, Andy Lutomirski wrote:
> Negative values are special.  Don't let users write them directly.
> 
> Signed-off-by: Andy Lutomirski <luto@...nel.org>

Acked-by: Pavel Machek <pavel@....cz>

> --- a/drivers/base/power/sysfs.c
> +++ b/drivers/base/power/sysfs.c
> @@ -263,7 +263,11 @@ static ssize_t pm_qos_latency_tolerance_store(struct device *dev,
>  	s32 value;
>  	int ret;
>  
> -	if (kstrtos32(buf, 0, &value)) {
> +	if (kstrtos32(buf, 0, &value) == 0) {
> +		/* Users can't write negative values directly */
> +		if (value < 0)
> +			return -EINVAL;
> +	} else {
>  		if (!strcmp(buf, "auto") || !strcmp(buf, "auto\n"))
>  			value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT;
>  		else if (!strcmp(buf, "any") || !strcmp(buf, "any\n"))

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

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