linux-kernel - Re: [PATCH 2/2] pinctrl: single: remove misuse of IRQF_NO

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Date:	Fri, 4 Dec 2015 16:15:29 +0000
From:	Sudeep Holla <sudeep.holla@....com>
To:	Tony Lindgren <tony@...mide.com>
Cc:	Sudeep Holla <sudeep.holla@....com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Grygorii Strashko <grygorii.strashko@...com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-omap@...r.kernel.org
Subject: Re: [PATCH 2/2] pinctrl: single: remove misuse of IRQF_NO_SUSPEND
 flag

Hi Tony,

On 04/12/15 15:40, Tony Lindgren wrote:
> * Tony Lindgren <tony@...mide.com> [151203 13:41]:
>> * Sudeep Holla <sudeep.holla@....com> [151203 11:00]:
>>>
>>> I have added irq_set_irq_wake(pcs_soc->irq, state) in pcs_irq_set_wake
>>> which ensures it's marked for wakeup.
>>
>> Hmm well see the error I pasted in this thread, maybe that provides
>> more clues.
>
> The irq_set_irq_wake(pcs_soc->irq, state) in pcs_irq_set_wake does not
> look right to me as pcs_irq_set_wake toggles the irq_wake for each pin
> separately, not for the whole controller.
>

After thinking more about it we need some way to tell IRQ core that
pcs_soc->irq is wakeup capable. Is that going to happen automatically
via dev_pm_set_dedicated_wake_irq as you mentioned earlier ?

> I think all that can be left out with the snipped from Grygorii, and maybe
> also the lock_class_key changes.
>

If we not calling irq_set_irq_wake(pcs_soc->irq) in pcs_irq_set_wake, do
you see possibility of lockdep recursion in any other paths.

Otherwise we don't need this if we remove irq_set_irq_wake(pcs_soc->irq)
from pcs_irq_set_wake

-- 
Regards,
Sudeep
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