linux-kernel - Re: [PATCH] cpufreq/scpi: fix handling return value of topology_physical_package

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Date:	Wed, 23 Dec 2015 16:11:06 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Andrzej Hajda <a.hajda@...sung.com>
Cc:	Sudeep Holla <sudeep.holla@....com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"open list:SYSTEM CONTROL & POWER INTERFACE (SCPI) Message..." 
	<linux-arm-kernel@...ts.infradead.org>,
	"open list:CPU FREQUENCY DRIVERS" <linux-pm@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cpufreq/scpi: fix handling return value of
 topology_physical_package_id

On 23-12-15, 11:37, Andrzej Hajda wrote:
> The function can return negative values, so its result should
> be assigned to signed variable.
> 
> The problem has been detected using proposed semantic patch
> scripts/coccinelle/tests/unsigned_lesser_than_zero.cocci [1].
> 
> [1]: http://permalink.gmane.org/gmane.linux.kernel/2038576
> 
> Signed-off-by: Andrzej Hajda <a.hajda@...sung.com>
> ---
>  drivers/cpufreq/scpi-cpufreq.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/cpufreq/scpi-cpufreq.c b/drivers/cpufreq/scpi-cpufreq.c
> index 2c3b16f..de5e89b 100644
> --- a/drivers/cpufreq/scpi-cpufreq.c
> +++ b/drivers/cpufreq/scpi-cpufreq.c
> @@ -31,7 +31,7 @@ static struct scpi_ops *scpi_ops;
>  
>  static struct scpi_dvfs_info *scpi_get_dvfs_info(struct device *cpu_dev)
>  {
> -	u8 domain = topology_physical_package_id(cpu_dev->id);
> +	int domain = topology_physical_package_id(cpu_dev->id);
>  
>  	if (domain < 0)
>  		return ERR_PTR(-EINVAL);

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>

-- 
viresh
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