linux-kernel - Re: [RFC,PATCH 1/2] Add a common struct clk

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Message-ID: <19473.61547.684572.647641@ipc1.ka-ro>
Date:	Fri, 11 Jun 2010 10:14:35 +0200
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Jeremy Kerr <jeremy.kerr@...onical.com>
Cc:	Ben Dooks <ben-linux@...ff.org>,
	Ben Herrenchmidt <benh@...nel.crashing.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC,PATCH 1/2] Add a common struct clk

Hi,

> > > +static inline int clk_enable(struct clk *clk)
> > > +{
> > > +	int ret = 0;
> > > +
> > > +	if (!clk->ops->enable)
> > > +		return 0;
> > > +
> > > +	mutex_lock(&clk->mutex);
> > > +	if (!clk->enable_count)
> > > +		ret = clk->ops->enable(clk);
> > > +
> > > +	if (!ret)
> > > +		clk->enable_count++;
> > > +	mutex_unlock(&clk->mutex);
> > > +
> > > +	return ret;
> > > +}
> > 
Using a mutex in clk_enable()/clk_disable() is a bad idea, since that
makes it impossible to call those functions in interrupt context.


Lothar Waßmann
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