linux-kernel - Re: [PATCH v2 0/6] ARM: at91: fix irq_pm_install

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Date:	Tue, 3 Mar 2015 16:35:40 +0100
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Peter Zijlstra <peterz@...radead.org>,
	Mark Rutland <mark.rutland@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	<linux-pm@...r.kernel.org>, Wim Van Sebroeck <wim@...ana.be>,
	<linux-watchdog@...r.kernel.org>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	<rtc-linux@...glegroups.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, <linux-serial@...r.kernel.org>,
	Mike Turquette <mturquette@...aro.org>,
	<linux-kernel@...r.kernel.org>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 0/6] ARM: at91: fix irq_pm_install_action WARNING

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@...el.com>

As it seems easier to keep the whole series together, I'll let Rafael
take it.

Thanks a lot for having taking care of this.

Best regards,


> [1]https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/kernel/irq/pm.c?id=cab303be91dc47942bc25de33dc1140123540800
> [2]https://lkml.org/lkml/2015/2/26/675
> 
> Changes since v1:
>  - replaced the IRQF_SUSPEND_NOACTION flag by IRQF_COND_SUSPEND
>  - properly addressed wakeup handling in drivers
> 
> Boris Brezillon (6):
>   PM / wakeup: export pm_system_wakeup symbol
>   rtc: at91sam9: rework wakeup and interrupt handling
>   rtc: at91rm9200: rework wakeup and interrupt handling
>   clk: at91: implement suspend/resume for the PMC irqchip
>   watchdog: at91sam9: request the irq with IRQF_NO_SUSPEND
>   tty: serial: atmel: rework interrupt and wakeup handling
> 
>  drivers/base/power/wakeup.c       |  1 +
>  drivers/clk/at91/pmc.c            | 20 ++++++++++-
>  drivers/clk/at91/pmc.h            |  1 +
>  drivers/rtc/rtc-at91rm9200.c      | 62 +++++++++++++++++++++++++--------
>  drivers/rtc/rtc-at91sam9.c        | 73 ++++++++++++++++++++++++++++++++-------
>  drivers/tty/serial/atmel_serial.c | 49 +++++++++++++++++++++++---
>  drivers/watchdog/at91sam9_wdt.c   |  3 +-
>  7 files changed, 177 insertions(+), 32 deletions(-)
> 


-- 
Nicolas Ferre
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