linux-kernel - Re: [PATCH 2/4] of/platform: return error on of_platform_device_create

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Date:	Wed, 14 May 2014 10:43:46 +0300
From:	"Ivan T. Ivanov" <iivanov@...sol.com>
To:	frowand.list@...il.com
Cc:	Olof Johansson <olof@...om.net>,
	Rob Herring <robherring2@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Josh Cartwright <joshc@...eaurora.org>,
	Courtney Cavin <courtney.cavin@...ymobile.com>,
	Bjorn Andersson <bjorn@...o.se>, Rob Herring <robh@...nel.org>
Subject: Re: [PATCH 2/4] of/platform: return error on
 of_platform_device_create_pdata failure

On Tue, 2014-05-13 at 13:32 -0700, Frank Rowand wrote:
> On 5/13/2014 10:56 AM, Olof Johansson wrote:
> > On Wed, May 07, 2014 at 04:48:16PM -0500, Rob Herring wrote:
> >> From: Rob Herring <robh@...nel.org>
> >>
> >> of_platform_populate does not return an error if creating the platform
> >> device fails. This means almost any error from driver core cannot be
> >> detected by the caller. Fix this.
> >>
> >> Signed-off-by: Rob Herring <robh@...nel.org>
> >> ---
> >>  drivers/of/platform.c | 4 +++-
> >>  1 file changed, 3 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/of/platform.c b/drivers/of/platform.c
> >> index 404d1da..622aeb3 100644
> >> --- a/drivers/of/platform.c
> >> +++ b/drivers/of/platform.c
> >> @@ -391,7 +391,9 @@ static int of_platform_bus_create(struct device_node *bus,
> >>  	}
> >>  
> >>  	dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent);
> >> -	if (!dev || !of_match_node(matches, bus))
> >> +	if (!dev)
> >> +		return -ENODEV;
> >> +	if (!of_match_node(matches, bus))
> >>  		return 0;
> >>  
> >>  	for_each_child_of_node(bus, child) {
> > 
> > This patch caused every single MMC driver to break on OF platforms, as far
> > as I can tell.  Reverting it on last night's -next seems to resolve it.
> > 
> > The problem seems to be that of_platform_populate() will bail on the
> > first device that fails this.
> > 
> > How did you test this code, Frank? On what platform? Practically all my
> > targets here failed to mount rootfs from eMMC or SD card...
> 
> I tested on a dragonboard, but without a working sdhci driver.  Thus I would not
> have hit the error.

Same here.

Regards,
Ivan

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