Re: [PATCH -next] I2C: Use helper function IS_ERR_OR_NULL()

From: "Russell King (Oracle)" <linux@armlinux.org.uk>
To: Ruan Jinjie <ruanjinjie@huawei.com>
Cc: linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	Codrin Ciubotariu <codrin.ciubotariu@microchip.com>,
	Andi Shyti <andi.shyti@kernel.org>,
	Nicolas Ferre <nicolas.ferre@microchip.com>,
	Alexandre Belloni <alexandre.belloni@bootlin.com>,
	Claudiu Beznea <claudiu.beznea@tuxon.dev>,
	Oleksij Rempel <linux@rempel-privat.de>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Shawn Guo <shawnguo@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Fabio Estevam <festevam@gmail.com>,
	NXP Linux Team <linux-imx@nxp.com>
Subject: Re: [PATCH -next] I2C: Use helper function IS_ERR_OR_NULL()
Date: Wed, 16 Aug 2023 11:22:00 +0100	[thread overview]
Message-ID: <ZNyjSO5OFNWOshii@shell.armlinux.org.uk> (raw)
In-Reply-To: <20230816094618.2854084-1-ruanjinjie@huawei.com>

On Wed, Aug 16, 2023 at 05:46:18PM +0800, Ruan Jinjie wrote:
> Use IS_ERR_OR_NULL() instead of open-coding it
> to simplify the code.
> 
> Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com>
> ---
>  drivers/i2c/busses/i2c-at91-master.c | 2 +-
>  drivers/i2c/busses/i2c-imx.c         | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-at91-master.c b/drivers/i2c/busses/i2c-at91-master.c
> index 94cff1cd527e..0e454c04a145 100644
> --- a/drivers/i2c/busses/i2c-at91-master.c
> +++ b/drivers/i2c/busses/i2c-at91-master.c
> @@ -831,7 +831,7 @@ static int at91_init_twi_recovery_gpio(struct platform_device *pdev,
>  	struct i2c_bus_recovery_info *rinfo = &dev->rinfo;
>  
>  	rinfo->pinctrl = devm_pinctrl_get(&pdev->dev);
> -	if (!rinfo->pinctrl || IS_ERR(rinfo->pinctrl)) {
> +	if (IS_ERR_OR_NULL(rinfo->pinctrl)) {
>  		dev_info(dev->dev, "can't get pinctrl, bus recovery not supported\n");
>  		return PTR_ERR(rinfo->pinctrl);
>  	}
> diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
> index 10e89586ca72..8807c90df749 100644
> --- a/drivers/i2c/busses/i2c-imx.c
> +++ b/drivers/i2c/busses/i2c-imx.c
> @@ -1388,7 +1388,7 @@ static int i2c_imx_init_recovery_info(struct imx_i2c_struct *i2c_imx,
>  	struct i2c_bus_recovery_info *rinfo = &i2c_imx->rinfo;
>  
>  	i2c_imx->pinctrl = devm_pinctrl_get(&pdev->dev);
> -	if (!i2c_imx->pinctrl || IS_ERR(i2c_imx->pinctrl)) {
> +	if (!IS_ERR_OR_NULL(i2c_imx->pinctrl)) {
>  		dev_info(&pdev->dev, "can't get pinctrl, bus recovery not supported\n");
>  		return PTR_ERR(i2c_imx->pinctrl);
>  	}

As stated in my previous reply to a similar patch, devm_pinctrl_get()
can not return NULL, so it makes more sense to remove the test for NULL
rather than "cleaning up" the buggy code, but leaving the bugs behind.

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