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

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Date:	Sat, 19 Apr 2014 00:18:17 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Tony Lindgren <tony@...mide.com>
Cc:	Thierry Reding <thierry.reding@...il.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	Grant Likely <grant.likely@...aro.org>,
	Paul Walmsley <paul@...an.com>,
	Rob Herring <robherring2@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] of/platform: Fix no irq domain found errors when
	populating interrupts

On Fri, Apr 18, 2014 at 02:37:51PM -0700, Tony Lindgren wrote:
> * Thierry Reding <thierry.reding@...il.com> [140411 11:40]:
> > On Fri, Apr 11, 2014 at 10:20:28AM +0100, Russell King - ARM Linux wrote:
> > > So what happens if a device driver probe function:
> > > 
> > > - creates a new platform device
> > > - copies the resources from the original to the new device
> > > - copies the of_node from the original to the new device
> > > - registers the new device
> > > 
> > > Yes, it's broken (because it can result in the same driver being re-probed
> > > by the new device) but we *do* have stuff in the kernel tree which does
> > > this.
> 
> Grr. Care to list some examples? See also if what I'm suggesting below
> if that might work for the cases you're describing.

Until recently, ahci_imx did exactly this, but that's been fixed now
(by reworking ahci into a library.)  I'm not immediately aware of any
other drivers pulling this trick.

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