Re: [PATCH v4 3/5] irqchip: Add DT binding doc for the virtual irq demuxer chip

Peter Zijlstra
2015-02-11T09:11:59Z

On Tue, Feb 10, 2015 at 08:48:36PM +0000, Mark Rutland wrote:
> From f390ccbb31f06efee49b4469943c8d85d963bfb5 Mon Sep 17 00:00:00 2001
> From: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>
> Date: Tue, 10 Feb 2015 20:14:33 +0000
> Subject: [PATCH] genirq: allow mixed IRQF_NO_SUSPEND requests
>
> In some cases a physical IRQ line may be shared between devices from
> which we expect interrupts during suspend (e.g. timers) and those we do
> not (e.g. anything we cut the power to). Where a driver did not request
> the interrupt with IRQF_NO_SUSPEND, it's unlikely that it can handle
> being called during suspend, and it may bring down the system.
>
> This patch adds logic to automatically mark the irqactions for these
> potentially unsafe handlers as disabled during suspend, leaving actions
> with IRQF_NO_SUSPEND enabled. If an interrupt is raised on a shared line
> during suspend, only the handlers requested with IRQF_NO_SUSPEND will be
> called. The handlers requested without IRQF_NO_SUSPEND will be skipped
> as if they had immediately returned IRQF_NONE.
>
> Cc: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
> Cc: Jason Cooper <jason-NLaQJdtUoK4Be96aLqz0jA@public.gmane.org>
> Cc: Nicolas Ferre <nicolas.ferre-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>
> Cc: Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
> Cc: Rafael J. Wysocki <rafael.j.wysocki-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> Cc: Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
> Signed-off-by: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>

Aw gawd.. not that again.

So Rafael and tglx went over this a few months ago I think:

lkml.kernel.org/r/26580319.OZP7jvJnA9-sKB8Sp2ER+y1GS7QM15AGw@public.gmane.org

is the last series I could find. Maybe Rafael can summarize?
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at http://vger.kernel.org/majordomo-info.html