linux-kernel - Re: [PATCH] tools, cpupower Fix error condition in cmd_freq

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Date:	Fri, 07 Feb 2014 15:39:32 -0500
From:	Prarit Bhargava <prarit@...hat.com>
To:	Prarit Bhargava <prarit@...hat.com>
CC:	linux-kernel@...r.kernel.org,
	Dominik Brodowski <linux@...inikbrodowski.net>,
	Thomas Renninger <trenn@...e.de>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Alan Cox <alan@...ux.intel.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Subject: Re: [PATCH] tools, cpupower Fix error condition in cmd_freq_set()



On 02/07/2014 01:55 PM, Prarit Bhargava wrote:
> On a system which has only 4.00GHz set as the only available frequency,
> 
> [root@...-pike-05 ~]# cpupower frequency-info
> <snip>
>   current policy: frequency should be within 4.00 GHz and 4.00 GHz.
>                   The governor "userspace" may decide which speed to use
>                   within this range.
> <snip>
> 
> setting the frequency to 2.8GHz does not return an error.
> 
> [root@...-pike-05 ~]# cpupower frequency-set --freq 2800MHz
> Setting cpu: 0
> Setting cpu: 1
> Setting cpu: 2
> Setting cpu: 3
> Setting cpu: 4
> Setting cpu: 5
> Setting cpu: 6
> Setting cpu: 7
> [root@...-pike-05 ~]#
> 
> The frequency set error should stop with an error message after the first
> failure.  Fix the error return in cmd_freq_set() to read errors as less
> than zero.
> 
> Signed-off-by: Prarit Bhargava <prarit@...hat.com>
> Cc: Dominik Brodowski <linux@...inikbrodowski.net>
> Cc: Thomas Renninger <trenn@...e.de>
> Cc: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
> Cc: Alan Cox <alan@...ux.intel.com>
> Cc: One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
> ---
>  tools/power/cpupower/utils/cpufreq-set.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/power/cpupower/utils/cpufreq-set.c b/tools/power/cpupower/utils/cpufreq-set.c
> index a416de8..e5f78623 100644
> --- a/tools/power/cpupower/utils/cpufreq-set.c
> +++ b/tools/power/cpupower/utils/cpufreq-set.c
> @@ -320,7 +320,7 @@ int cmd_freq_set(int argc, char **argv)
>  
>  		printf(_("Setting cpu: %d\n"), cpu);
>  		ret = do_one_cpu(cpu, &new_pol, freq, policychange);
> -		if (ret)
> +		if (ret < 0)

Self-nack ... this won't work.

P.
>  			break;
>  	}
>  
--
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