linux-kernel - Re: [PATCH v6 22/22] of/platform: Defer probes of registered devices

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Date:	Wed, 21 Oct 2015 00:54:05 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
CC:	<linux-kernel@...r.kernel.org>, Rob Herring <robh+dt@...nel.org>,
	"Stephen Warren" <swarren@...dotorg.org>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mark Brown <broonie@...nel.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alan Stern <stern@...land.harvard.edu>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	<linux-arm-kernel@...ts.infradead.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	<devicetree@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	<linux-acpi@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>,
	<linuxppc-dev@...ts.ozlabs.org>,
	Hu Mingkai-B21284 <Mingkai.Hu@...escale.com>
Subject: Re: [PATCH v6 22/22] of/platform: Defer probes of registered devices

On Mon, 2015-09-21 at 16:03 +0200, Tomeu Vizoso wrote:
> Instead of trying to match and probe platform and AMBA devices right
> after each is registered, delay their probes until device_initcall_sync.
> 
> This means that devices will start probing once all built-in drivers
> have registered, and after all platform and AMBA devices from the DT
> have been registered already.
> 
> This allows us to prevent deferred probes by probing dependencies on
> demand.
> 
> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
> ---
> 
> Changes in v4:
> - Also defer probes of AMBA devices registered from the DT as they can
>   also request resources.
> 
>  drivers/of/platform.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)

This breaks arch/powerpc/sysdev/fsl_pci.c.  The PCI bus is an OF platform 
device, and it must be probed before pcibios_init() which is a 
subsys_initcall(), or else the PCI bus never gets scanned.

-Scott

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