linux-kernel - Re: [RFC][PATCH] gpiolib: add irq_wake (power-management) sysfs file

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Message-ID: <20111116143857.GB5847@una0919255>
Date:	Wed, 16 Nov 2011 15:39:00 +0100
From:	Patrick Combes <p-combes@...com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	grant.likely@...retlab.ca, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, Hugo Dupras <h-dupras@...com>
Subject: Re: [RFC][PATCH] gpiolib: add irq_wake (power-management) sysfs
 file

On Tue, Nov 15, 2011 at 05:20:53PM +0000, Russell King - ARM Linux wrote:
> On Tue, Nov 15, 2011 at 01:16:37PM +0000, Mark Brown wrote:
> > On Fri, Nov 11, 2011 at 10:40:06AM +0100, Patrick Combes wrote:
> > > +	else if (sysfs_streq(buf, "enable") || sysfs_streq(buf, "1"))
> > > +		status = enable_irq_wake(gpio_to_irq(gpio));
> > > +	else if (sysfs_streq(buf, "disable") || sysfs_streq(buf, "0"))
> > > +		status = disable_irq_wake(gpio_to_irq(gpio));
> > > +	else
> > > +		status = -EINVAL;
> > 
> > ...this doesn't do anything to stop userspace doing multiple enables and
> > disables.
> 
> It doesn't check whether gpio_to_irq(gpio) returns something sane either.
> It should be doing something like this before taking the mutex:
> 
> 	irq = gpio_to_irq(gpio);
> 	if (irq <= 0)
> 		return irq < 0 ? irq : -EINVAL;
> 
> and then doing (enable|disable)_irq_wake() on irq.

Ok I add this check
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