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

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Message-Id: <20090227123344.33196e99.akpm@linux-foundation.org>
Date:	Fri, 27 Feb 2009 12:33:44 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Felipe Balbi <me@...ipebalbi.com>
Cc:	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, 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 ;)
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