linux-kernel - Re: [PATCH v3] extcon: palmas: hide error messages if gpio returns -EPROBE

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Message-Id: <C3D9F783-EE45-4681-93D9-C1407284CB59@goldelico.com>
Date:   Mon, 17 Feb 2020 14:58:14 +0100
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>
Cc:     linux-kernel@...r.kernel.org, letux-kernel@...nphoenux.org,
        kernel@...a-handheld.com, linux-omap@...r.kernel.org
Subject: Re: [PATCH v3] extcon: palmas: hide error messages if gpio returns -EPROBE_DEFER


> Am 17.02.2020 um 14:38 schrieb H. Nikolaus Schaller <hns@...delico.com>:
> 
> If the gpios are probed after this driver (e.g. if they
> come from an i2c expander) there is no need to print an
> error message.
> 
> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> ---
> drivers/extcon/extcon-palmas.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-palmas.c b/drivers/extcon/extcon-palmas.c
> index edc5016f46f1..cea58d0cb457 100644
> --- a/drivers/extcon/extcon-palmas.c
> +++ b/drivers/extcon/extcon-palmas.c
> @@ -205,14 +205,18 @@ static int palmas_usb_probe(struct platform_device *pdev)
> 
> 	palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id",
> 							GPIOD_IN);
> -	if (IS_ERR(palmas_usb->id_gpiod)) {
> +	if (PTR_ERR(palmas_usb->id_gpiod) == -EPROBE_DEFER) {
> +		return -EPROBE_DEFER;
> +	} else if (IS_ERR(palmas_usb->id_gpiod)) {

Hm.

While looking again at that: why do we need the "{" and "} else "?

It should be sufficient to have

> 	palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id",
> 							GPIOD_IN);
> +	if (PTR_ERR(palmas_usb->id_gpiod) == -EPROBE_DEFER)
> +		return -EPROBE_DEFER;
> 	if (IS_ERR(palmas_usb->id_gpiod)) {

What do you think is better coding style here?

BR,
Nikolaus Schaller