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From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Boris Brezillon <boris.brezillon@free-electrons.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Jason Cooper <jason@lakedaemon.net>,
        Peter Zijlstra <peterz@infradead.org>,
        Mark Rutland <mark.rutland@arm.com>, Len Brown <len.brown@intel.com>,
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        Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>,
        Alexandre Belloni <alexandre.belloni@free-electrons.com>,
        linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 0/6] ARM: at91: fix irq_pm_install_action WARNING
Date: Wed, 04 Mar 2015 02:43:08 +0100
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On Tuesday, March 03, 2015 04:35:40 PM Nicolas Ferre wrote:
> Le 02/03/2015 10:18, Boris Brezillon a écrit :
> > My apologies to those of you who already received this series, but I
> > didn't increment the patch version and forgot some subsystem maintainers
> > and MLs.
> > 
> > Commit cab303be91dc47942bc25de33dc1140123540800 [1] introduced a WARN_ON
> > test which triggers a WARNING backtrace on at91 platforms.
> > While this WARN_ON is absolutely necessary to warn users that they should
> > not mix request with and without IRQF_NO_SUSPEND flags on shared IRQs,
> > there is no easy way to solve this issue on at91 platforms.
> > 
> > The main reason is that the init timer is often using a shared irq line
> > and thus request this irq with IRQF_NO_SUSPEND flag set, while other
> > peripherals request the same irq line without this flag.
> > 
> > This problem has recently been addressed by this patch [2] which adds
> > a new IRQF_COND_SUSPEND flag, that authorize mixing IRQF_NO_SUSPEND and
> > !IRQF_NO_SUSPEND as long as irq handlers setting IRQF_COND_SUSPEND
> > can safely be called in suspended state.
> > 
> > Doing this also implies taking care of system wakeup in devices handlers
> > if they tag the IRQ line as a wakeup source.
> > The first patch of this series exports the pm_system_wakeup symbol so
> > that drivers can call pm_system_wakeup from their interrupt handler.
> > 
> > This series then patches all at91 drivers that can have devices sharing
> > their IRQ line with a timer.
> > 
> > This series depends on [2].
> 
> I'm okay with all the patches:
> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
> 
> As it seems easier to keep the whole series together, I'll let Rafael
> take it.

OK, I'll queue up the patches for the next PM pull request.

Thanks!