linux-kernel - Re: [PATCH] of/platform: Fix no irq domain found errors when populating interrupts

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Date:	Tue, 10 Dec 2013 03:39:02 +0000 (UTC)
From:	Paul Walmsley <paul@...an.com>
To:	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>
cc:	Tony Lindgren <tony@...mide.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] of/platform: Fix no irq domain found errors when populating
 interrupts

Hi Grant, Rob,

On Sun, 24 Nov 2013, Grant Likely wrote:

> On Fri, 22 Nov 2013 17:50:35 -0800, Tony Lindgren <tony@...mide.com> wrote:
> > * Tony Lindgren <tony@...mide.com> [131122 17:16]:
> > > * Tony Lindgren <tony@...mide.com> [131122 17:09]:
> > > > * Russell King - ARM Linux <linux@....linux.org.uk> [131122 16:56]:
> > > > > On Fri, Nov 22, 2013 at 04:43:35PM -0800, Tony Lindgren wrote:
> > > > > > +		/* See of_device_resource_notify for populating interrupts */
> > > > > > +		for (i = 0; i < num_irq; i++, res++) {
> > > > > > +			res->flags = IORESOURCE_IRQ;
> > > > > > +			res->start = -EPROBE_DEFER;
> > > > > > +			res->end = -EPROBE_DEFER;
> > > > > 
> > > > > NAK.  Definitely a bad idea to start introducing magic values other into
> > > > > resources.  Please don't do this.
> > > > 
> > > > Do you have any better ideas on how to sort out this issue then?
> > > 
> > > I guess we could allocate all the resources lazily here, I'll take a look
> > > at that.
> > 
> > Here's a version that allocates the resources lazily with the notifier.
> > Seems to boot, need to play with it a bit more though to make sure we're
> > not overwriting resources for any legacy devices.
> 
> Blurg. Using a notifier really feels like we don't have a good handle on
> a reasonable solution yet. Basically it means we're hooking into the
> driver core without /looking/ like we're hooking into the driver core. I
> don't think this is any better, but I don't have a better suggestion at
> the moment.   :-(

Unfortunately this patch, or something that accomplishes the same results, 
is somewhat high-priority for us on OMAP.  OMAP37xx got prematurely 
converted to DT booting, and now dynamic power management is broken:

    http://marc.info/?l=linux-arm-kernel&m=138658294830408&w=2

Tony writes that this patch is one of the two patches needed to get things 
working again:

    http://marc.info/?l=linux-arm-kernel&m=138660942506846&w=2

Is it possible to get this patch, or something similar, merged for 
v3.13-rc?

Once something like PM is broken, it's pretty easy for other broken 
patches to make it into the tree, since it becomes very difficult to test 
without turning into a maintainer denial-of-service attack.


- Paul
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