Re: [PATCH v2 0/6] ARM: at91: fix irq_pm_install_action WARNING

Alexandre Belloni
2015-03-03T08:57:10Z

On 02/03/2015 at 10:18:12 +0100, Boris Brezillon wrote :
> 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].
>

For the whole series:
Reviewed-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

--
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering