linux-kernel - Re: [PATCH V3 5/6] Avoid duplicate probe for of platform devices

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Date:	Thu, 5 Jul 2012 21:26:11 -0700
From:	Greg KH <greg@...ah.com>
To:	Jia Hongtao-B38951 <B38951@...escale.com>
Cc:	Rob Herring <robherring2@...il.com>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Li Yang-R58472 <r58472@...escale.com>
Subject: Re: [PATCH V3 5/6] Avoid duplicate probe for of platform devices

On Fri, Jul 06, 2012 at 02:05:05AM +0000, Jia Hongtao-B38951 wrote:
> Hi Rob and Greg KH,
> 
> Do you have any better idea to avoid duplication probe warning?

I have no idea what the problem is that you are trying to solve.

> > On 06/08/2012 04:43 AM, Jia Hongtao wrote:
> > > We changed the pcie controller driver to platform driver so that the
> > PCI
> > > of platform devices need to be created earlier in the arch_initcall
> > stage
> > > according to the original timing of calling fsl_add_bridge(). So we do
> > PCI
> > > probing separately from other devices. But probing more than once could
> > > cause duplication warning. We add check if the devices have already
> > probed
> > > before probing any devices to avoid duplication warning.

Ick, something else is going wrong here, how could you ever have the
same device probed more than once?

> > > Signed-off-by: Jia Hongtao <B38951@...escale.com>
> > > Signed-off-by: Li Yang <leoli@...escale.com>
> > > ---
> > 
> > Where's v1 and v2 history?
> > 
> > >  drivers/of/platform.c |   18 ++++++++++++------
> > >  1 files changed, 12 insertions(+), 6 deletions(-)
> > >
> > > diff --git a/drivers/of/platform.c b/drivers/of/platform.c
> > > index a37330e..3aab01f 100644
> > > --- a/drivers/of/platform.c
> > > +++ b/drivers/of/platform.c
> > > @@ -139,6 +139,18 @@ struct platform_device *of_device_alloc(struct
> > device_node *np,
> > >  	if (!dev)
> > >  		return NULL;
> > >
> > > +	dev->dev.of_node = of_node_get(np);
> > > +	if (bus_id)
> > > +		dev_set_name(&dev->dev, "%s", bus_id);
> > > +	else
> > > +		of_device_make_bus_id(&dev->dev);
> > > +
> > > +	if (kset_find_obj(dev->dev.kobj.kset, kobject_name(&dev->dev.kobj)))

Whatever you are trying to do here, odds are, it's wrong :)

What is happening that is causing the problem?  What is causing the
platform core to be calling probe on a device more than once?

greg k-h
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