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

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Message-ID: <20200221074740.GA44103@lenoch>
Date:   Fri, 21 Feb 2020 08:47:40 +0100
From:   Ladislav Michl <ladis@...ux-mips.org>
To:     Chanwoo Choi <cw00.choi@...sung.com>
Cc:     "H. Nikolaus Schaller" <hns@...delico.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        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

On Tue, Feb 18, 2020 at 08:09:16PM +0900, Chanwoo Choi wrote:
> On 2/18/20 7:48 PM, Ladislav Michl wrote:
> > On Tue, Feb 18, 2020 at 07:35:47PM +0900, Chanwoo Choi wrote:
> >> On 2/18/20 7:21 PM, Ladislav Michl wrote:
> >>> On Tue, Feb 18, 2020 at 12:28:25PM +0900, Chanwoo Choi wrote:
> >>>> On 2/17/20 10:38 PM, H. Nikolaus Schaller wrote:
> >>>>> 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;
> > 
> > Here we returned...
> 
> hmm. you better to suggest the result of cocci script
> to understand why it is matter.

You can browse similar fixes online :)
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/?qt=grep&q=else+after+return

Best regards,
	ladis