linux-kernel - Re: [for-next PATCH] PM / devfreq: Add sysfs node to expose available frequencies

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Message-ID: <20121026000321.GA4190@kahuna>
Date:	Thu, 25 Oct 2012 19:03:21 -0500
From:	Nishanth Menon <nm@...com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	linux-pm <linux-pm@...r.kernel.org>,
	Rajagopal Venkat <rajagopal.venkat@...aro.org>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Kevin Hilman <khilman@...com>, <linux-kernel@...r.kernel.org>
Subject: Re: [for-next PATCH] PM / devfreq: Add sysfs node to expose
 available frequencies

On 01:56-20121026, Rafael J. Wysocki wrote:
> On Thursday, October 25, 2012 06:32:43 PM Nishanth Menon wrote:
[..]
> > +static ssize_t show_available_freqs(struct device *d,
> > +				    struct device_attribute *attr,
> > +				    char *buf)
> > +{
> > +	struct devfreq *df = to_devfreq(d);
> > +	struct device *dev = df->dev.parent;
> > +	struct opp *opp;
> > +	ssize_t count = 0;
> > +	unsigned long freq = 0;
> > +
> > +	rcu_read_lock();
> > +	do {
> > +		opp = opp_find_freq_ceil(dev, &freq);
> > +		if (IS_ERR(opp))
> > +			break;
> > +
> > +		count += sprintf(&buf[count], "%lu ", freq);
> > +		freq++;
> > +	} while (1);
> > +	rcu_read_unlock();
> > +	count += sprintf(&buf[count], "\n");
> 
> Care to avoid printing the tailing space?
count -= count ? 1 : 0;
count += sprintf(&buf[count], "\n");
should take care of empty list and the trailing space. Sounds reasonable?

-- 
Regards,
Nishanth Menon
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