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

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Message-ID: <419d5b97-9d8e-dcbe-3984-006f1e261161@arm.com>
Date:   Fri, 12 Jan 2018 15:27:23 +0000
From:   Sudeep Holla <sudeep.holla@....com>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Sudeep Holla <sudeep.holla@....com>,
        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 12/01/18 12:58, Thierry Reding wrote:
> On Fri, Jan 12, 2018 at 12:12:11PM +0000, Sudeep Holla wrote:
>>
>>
>> On 12/01/18 11:39, 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 ?
>>>
>>
>> Further, I still the error messags on my Juno with this patch applied. I
>> fail to see how this patch prevents brcmstb_biuctrl_init which is
>> early_initcall in drivers/soc/bcm/brcmstb/biuctrl.c getting called ?
> 
> I'm not sure I understand. There's no way we can prevent the early
> initcall from running. The point here is to prevent it from running code
> that shouldn't be run on a platform.
> 

Sorry for missing the context, I was referring [1]

-- 
Regards,
Sudeep

[1] [1] https://marc.info/?l=linux-kernel&m=151568158127806&w=2