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

[Peter Zijlstra]

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 at arm.com>
> 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 at free-electrons.com>
> Cc: Jason Cooper <jason at lakedaemon.net>
> Cc: Nicolas Ferre <nicolas.ferre at atmel.com>
> Cc: Peter Zijlstra <peterz at infradead.org>
> Cc: Rafael J. Wysocki <rafael.j.wysocki at intel.com>
> Cc: Thomas Gleixner <tglx at linutronix.de>
> Signed-off-by: Mark Rutland <mark.rutland at arm.com>

Aw gawd.. not that again.

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

  lkml.kernel.org/r/26580319.OZP7jvJnA9 at vostro.rjw.lan

is the last series I could find. Maybe Rafael can summarize?