linux-kernel - Re: [PATCH 2/4] i2c: at91: implement i2c bus recovery

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Date:   Mon, 7 Oct 2019 10:17:53 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <u.kleine-koenig@...gutronix.de>
CC:     <kamel.bouhara@...tlin.com>, <wsa@...-dreams.de>,
        <linux-i2c@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <Nicolas.Ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <Ludovic.Desroches@...rochip.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 2/4] i2c: at91: implement i2c bus recovery



On 04.10.2019 23:39, Uwe Kleine-König wrote:
> External E-Mail
> 
> 
> On Fri, Oct 04, 2019 at 09:35:23AM +0000, Claudiu.Beznea@...rochip.com wrote:
>> Hi Kamel,
>>
>> On 02.10.2019 17:46, Kamel Bouhara wrote:
>>> +static int at91_init_twi_recovery_info(struct platform_device *pdev,
>>> +				       struct at91_twi_dev *dev)
>>> +{
>>> +	struct i2c_bus_recovery_info *rinfo = &dev->rinfo;
>>> +
>>> +	dev->pinctrl = devm_pinctrl_get(&pdev->dev);
>>> +	if (!dev->pinctrl || IS_ERR(dev->pinctrl)) {
>>
>> You may use IS_ERR_OR_NULL() here.
> 
> Can devm_pinctrl_get return NULL? From a quick look, it cannot.

Looking quickly though it, yes, it seems it can't.

> 
> rule of thumb: IS_ERR_OR_NULL is wrong as it is a sign of poor return
> value semantics.
> 
> Best regards
> Uwe
>