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

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Message-ID: <20191004203933.tfhr6cwbsq2hxrov@pengutronix.de>
Date:   Fri, 4 Oct 2019 22:39:33 +0200
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Claudiu.Beznea@...rochip.com
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 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.

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

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |