linux-kernel - Re: [PATCH v3 01/13] thermal: qoriq: Remove unnecessary DT node is NULL check

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Message-ID: <6cc7173a-ea45-4f79-61e6-bcfe1b9aaa4a@linaro.org>
Date:   Thu, 11 Apr 2019 18:52:20 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Andrey Smirnov <andrew.smirnov@...il.com>
Cc:     linux-pm@...r.kernel.org, Chris Healy <cphealy@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Angus Ainslie <angus@...ea.ca>,
        dl-linux-imx <linux-imx@....com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 01/13] thermal: qoriq: Remove unnecessary DT node is
 NULL check

On 05/04/2019 19:51, Andrey Smirnov wrote:
> On Wed, Apr 3, 2019 at 8:21 PM Daniel Lezcano <daniel.lezcano@...aro.org> wrote:
>>
>> On 01/04/2019 06:14, Andrey Smirnov wrote:
>>> This driver is meant to be used with Device Tree and there's no
>>> use-case where device's DT node is going to be NULL. Remove code
>>> protecting against that.
>>
>> May be elaborate why is never going to be NULL?
>>
> 
> Hmm, I am not sure what can be elaborated further than what's already
> there. The driver is written to be instantiated via DT and there's no
> code that tries to do that via board code or anything like that. I am
> guessing you maybe read the description differently. Can you help me
> by giving an example of what you think needs clarifying?

May be just say if the probe function is called, the dev.of_node is
guarantee to be filled by the underlying framework because the
compatible string was found so the check is pointless.

Anyway, it is a detail.

>>> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
>>> Cc: Chris Healy <cphealy@...il.com>
>>> Cc: Lucas Stach <l.stach@...gutronix.de>
>>> Cc: Zhang Rui <rui.zhang@...el.com>
>>> Cc: Eduardo Valentin <edubezval@...il.com>
>>> Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
>>> Cc: Angus Ainslie (Purism) <angus@...ea.ca>
>>> Cc: linux-imx@....com
>>> Cc: linux-pm@...r.kernel.org
>>> Cc: linux-kernel@...r.kernel.org
>>
>> Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>
>>
>>> ---
>>>  drivers/thermal/qoriq_thermal.c | 5 -----
>>>  1 file changed, 5 deletions(-)
>>>
>>> diff --git a/drivers/thermal/qoriq_thermal.c b/drivers/thermal/qoriq_thermal.c
>>> index 3b5f5b3fb1bc..7b364933bfb1 100644
>>> --- a/drivers/thermal/qoriq_thermal.c
>>> +++ b/drivers/thermal/qoriq_thermal.c
>>> @@ -193,11 +193,6 @@ static int qoriq_tmu_probe(struct platform_device *pdev)
>>>       struct qoriq_tmu_data *data;
>>>       struct device_node *np = pdev->dev.of_node;
>>>
>>> -     if (!np) {
>>> -             dev_err(&pdev->dev, "Device OF-Node is NULL");
>>> -             return -ENODEV;
>>> -     }
>>> -
>>>       data = devm_kzalloc(&pdev->dev, sizeof(struct qoriq_tmu_data),
>>>                           GFP_KERNEL);
>>>       if (!data)
>>>
>>
>>
>> --
>>  <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs
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