linux-kernel - Re: [PATCH 1/2] input: misc: add twl4030-pwrbutton driver

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Date:	Fri, 27 Feb 2009 22:37:18 +0200
From:	Felipe Balbi <me@...ipebalbi.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Felipe Balbi <me@...ipebalbi.com>, linux-kernel@...r.kernel.org,
	linux-input@...r.kernel.org, felipe.balbi@...ia.com,
	dbrownell@...rs.sourceforge.net, dmitry.torokhov@...il.com,
	sameo@...nedhand.com, Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 1/2] input: misc: add twl4030-pwrbutton driver

On Fri, Feb 27, 2009 at 12:33:44PM -0800, Andrew Morton wrote:
> On Fri, 27 Feb 2009 21:28:02 +0200
> Felipe Balbi <me@...ipebalbi.com> wrote:
> 
> > +static irqreturn_t powerbutton_irq(int irq, void *dev_id)
> > +{
> > +	int err;
> > +	u8 value;
> > +
> > +#ifdef CONFIG_LOCKDEP
> > +	/* WORKAROUND for lockdep forcing IRQF_DISABLED on us, which
> > +	 * we don't want and can't tolerate.  Although it might be
> > +	 * friendlier not to borrow this thread context...
> > +	 */
> > +	local_irq_enable();
> > +#endif
> > +
> > +	err = twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &value,
> > +				  STS_HW_CONDITIONS);
> > +	if (!err)  {
> > +		input_report_key(powerbutton_dev, KEY_POWER,
> > +				 value & PWR_PWRON_IRQ);
> > +	} else {
> > +		dev_err(dbg_dev, "twl4030: i2c error %d while reading TWL4030"
> > +			" PM_MASTER STS_HW_CONDITIONS register\n", err);
> > +	}
> > +
> > +	return IRQ_HANDLED;
> > +}
> 
> Tell us some more about this lockdep thing ;)

David Brownell can comment better about it, that came from him when we
were converting twl4030 driver(s) to a more readable form :-)

If you take a look at all twl4030's children, you'll all of them needed
that.

Dave, could you comment, please ?

-- 
balbi
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