linux-kernel - Re: [PATCH] soc: brcmstb: Only register SoC device on STB platforms

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Date:   Fri, 12 Jan 2018 13:56:43 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     Brian Norris <computersforpeace@...il.com>,
        Gregory Fong <gregory.0xf0@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>, arm@...nel.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] soc: brcmstb: Only register SoC device on STB platforms

On Fri, Jan 12, 2018 at 11:39:30AM +0000, Sudeep Holla wrote:
> 
> 
> On 09/01/18 14:54, Thierry Reding wrote:
> > From: Thierry Reding <treding@...dia.com>
> > 
> > After moving the SoC device initialization to an early initcall in
> > commit f780429adfbc ("soc: brcmstb: biuctrl: Move to early_initcall"),
> > the Broadcom STB SoC device is registered on all platforms if support
> > for the device is enabled in the kernel configuration.
> > 
> > This causes an additional SoC device to appear on platforms that already
> > register a native one. In case of Tegra the STB SoC device is registered
> > as soc0 (with totally meaningless content in the sysfs attributes) and
> > causes various scripts and programs to fail because they don't know how
> > to parse that data.
> > 
> > To fix this, duplicate the check from brcmstb_soc_device_early_init()
> > that already prevents the code from doing anything nonsensical on non-
> > STB platforms.
> > 
> > Fixes: f780429adfbc ("soc: brcmstb: biuctrl: Move to early_initcall")
> > Signed-off-by: Thierry Reding <treding@...dia.com>
> > ---
> >  drivers/soc/bcm/brcmstb/common.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/drivers/soc/bcm/brcmstb/common.c b/drivers/soc/bcm/brcmstb/common.c
> > index 781ada62d0a3..4fe1cb73b39a 100644
> > --- a/drivers/soc/bcm/brcmstb/common.c
> > +++ b/drivers/soc/bcm/brcmstb/common.c
> > @@ -89,8 +89,13 @@ early_initcall(brcmstb_soc_device_early_init);
> >  static int __init brcmstb_soc_device_init(void)
> >  {
> >  	struct soc_device_attribute *soc_dev_attr;
> > +	struct device_node *sun_top_ctrl;
> >  	struct soc_device *soc_dev;
> >  
> > +	sun_top_ctrl = of_find_matching_node(NULL, sun_top_ctrl_match);
> > +	if (!sun_top_ctrl)
> > +		return -ENODEV;
> > +
> 
> missing of_node_put(sun_top_ctrl) ? or am I missing to see that elsewhere ?

Hm... you're right. I was blindly copying this from
brcmstb_soc_device_early() which doesn't have the of_node_put() either.
Let me fix this up with another couple of patches.

Thanks,
Thierry

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