linux-kernel - Re: [PATCH 0/6] ARM: at91: fix irq_pm_install

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Date:	Mon, 2 Mar 2015 10:05:58 +0100
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Peter Zijlstra <peterz@...radead.org>,
	Mark Rutland <mark.rutland@....com>,
	linux-kernel@...r.kernel.org,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 0/6] ARM: at91: fix irq_pm_install_action WARNING

Hi Rafael,

On Fri, 27 Feb 2015 23:33:35 +0100
"Rafael J. Wysocki" <rjw@...ysocki.net> wrote:

> On Friday, February 27, 2015 04:09:52 PM Boris Brezillon wrote:
> > 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].
> 
> Series looks good to me (although admittedly I'm not familiar with the
> drivers in question).
> 
> Do you want me to apply it on top of [2]?

I'd like to wait for Nicolas' ack.
BTW, I realized I didn't send the series to the relevant subsystem
maintainers and I forgot to increment the patch version (I already
posted a v1 a few weeks ago), so I'll probably resend it.

You can take the first patch though.

Thanks,

Boris

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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