linux-kernel - Re: od_set_powersave_bias: NULL pointer dereference

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Message-ID: <20130627152143.GA5324@jshin-Toonie>
Date:	Thu, 27 Jun 2013 10:21:43 -0500
From:	Jacob Shin <jacob.shin@....com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
CC:	Tim Gardner <tim.gardner@...onical.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>, <cpufreq@...r.kernel.org>,
	<linux-pm@...r.kernel.org>
Subject: Re: od_set_powersave_bias: NULL pointer dereference

On Thu, Jun 27, 2013 at 08:39:12PM +0530, Viresh Kumar wrote:
> On 27 June 2013 20:25, Jacob Shin <jacob.shin@....com> wrote:
> > diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
> > index 4b9bb5d..93eb5cb 100644
> > --- a/drivers/cpufreq/cpufreq_ondemand.c
> > +++ b/drivers/cpufreq/cpufreq_ondemand.c
> > @@ -47,6 +47,8 @@ static struct od_ops od_ops;
> >  static struct cpufreq_governor cpufreq_gov_ondemand;
> >  #endif
> >
> > +static unsigned int default_powersave_bias;
>
> Why are the above three changes required? And in case they are, then
> they must have been commited separately.
> 
> Because you haven't replied to my earlier comment on this, I
> thought you agreed. But it looks you haven't read my first
> reply well.

Sorry I totally missed it,

I was trying to account for the case when od_set_powersave_bias() is
called while ondemand is not the current governor. And then later
becomes the current governor. So when od_init() is called it will take
the expected default, rather than 0.

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