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

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Message-ID: <4c805425-40fd-68d2-65c7-4f3c25f315a6@gmail.com>
Date:   Fri, 12 Jan 2018 10:27:30 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Olof Johansson <olof@...om.net>,
        Sudeep Holla <sudeep.holla@....com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Brian Norris <computersforpeace@...il.com>,
        Gregory Fong <gregory.0xf0@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        ARM-SoC Maintainers <arm@...nel.org>,
        Broadcom Kernel Feedback List 
        <bcm-kernel-feedback-list@...adcom.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] soc: brcmstb: Only register SoC device on STB platforms

On 01/12/2018 10:21 AM, Olof Johansson wrote:
> On Fri, Jan 12, 2018 at 10:19 AM, Olof Johansson <olof@...om.net> wrote:
>> On Fri, Jan 12, 2018 at 7:27 AM, Sudeep Holla <sudeep.holla@....com> wrote:
>>>
>>>
>>> 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
>>
>>
>> Do we have an incremental patch coming, or should I revert this?
> 
> Oh, d'oh. Just noticed the 3-patch series.
> 
> Acks from the involved parties would be appreciated before I apply.

Please revert, I will submit a simpler fix which is a combination of
Thierry's and Sudeep's patches. Sorry about the mess.
-- 
Florian