linux-kernel - Re: irq mask swapping during suspend/resume

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Date:	Wed, 17 Sep 2014 12:05:42 -0700 (PDT)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Eric Caruso <ejcaruso@...gle.com>
cc:	rjw@...ysocki.net, linux-kernel@...r.kernel.org,
	Benson Leung <bleung@...gle.com>,
	Dmitry Torokhov <dtor@...gle.com>
Subject: Re: irq mask swapping during suspend/resume

On Tue, 16 Sep 2014, Eric Caruso wrote:
> We would like to be able to set different irq masks for triggers during
> normal operation and for waking up the system. For example, while a laptop
> is awake, closing the lid and opening the lid should both fire an
> interrupt, but when the system is asleep, we would like to stay asleep when
> closing the lid.
> 
> We are thinking about stashing the irq mask used specifically for waking
> the system up in the irq_desc struct, and then swapping it during
> enable_irq_wake and disable_irq_wake calls. Devices that do not specify a
> different wake mask will use their normal trigger mask for both situations.
> 
> Is this acceptable?

Not really. Why should irq_desc provide storage for random
configurations and bind them to some random system state?

What's wrong with calling 

       irq_set_type(irq, B);
       enable_irq_wake(irq);

       disable_irq_wake(irq);
       irq_set_type(irq, A);

????

Thanks,

	tglx
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