linux-kernel - Re: [PATCH v3 5/9] i2c: qcom-cci: Use dev_err

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Date:   Thu, 10 Aug 2023 08:06:05 -0700
From:   Bjorn Andersson <quic_bjorande@...cinc.com>
To:     Liao Chang <liaochang1@...wei.com>
CC:     <andi.shyti@...nel.org>, <florian.fainelli@...adcom.com>,
        <rjui@...adcom.com>, <sbranden@...adcom.com>,
        <bcm-kernel-feedback-list@...adcom.com>,
        <yangyicong@...ilicon.com>, <aisheng.dong@....com>,
        <shawnguo@...nel.org>, <s.hauer@...gutronix.de>,
        <kernel@...gutronix.de>, <festevam@...il.com>, <linux-imx@....com>,
        <kblaiech@...dia.com>, <asmaa@...dia.com>,
        <loic.poulain@...aro.org>, <rfoss@...nel.org>, <ardb@...nel.org>,
        <gcherian@...vell.com>, <linux-i2c@...r.kernel.org>,
        <linux-rpi-kernel@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v3 5/9] i2c: qcom-cci: Use dev_err_probe in probe function

On Tue, Aug 08, 2023 at 09:29:50AM +0800, Liao Chang wrote:
> Use the dev_err_probe function instead of dev_err in the probe function
> so that the printed messge includes the return value and also handles
> -EPROBE_DEFER nicely.
> 
> Reviewed-by: Andi Shyti <andi.shyti@...nel.org>
> Signed-off-by: Liao Chang <liaochang1@...wei.com>
> ---
>  drivers/i2c/busses/i2c-qcom-cci.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-qcom-cci.c b/drivers/i2c/busses/i2c-qcom-cci.c
> index 622dc14add9d..cf13abec05f1 100644
> --- a/drivers/i2c/busses/i2c-qcom-cci.c
> +++ b/drivers/i2c/busses/i2c-qcom-cci.c
> @@ -588,10 +588,8 @@ static int cci_probe(struct platform_device *pdev)
>  	/* Clocks */
>  
>  	ret = devm_clk_bulk_get_all(dev, &cci->clocks);
> -	if (ret < 1) {
> -		dev_err(dev, "failed to get clocks %d\n", ret);
> -		return ret;
> -	}
> +	if (ret < 1)
> +		return dev_err_probe(dev, ret, "failed to get clocks\n");

devm_clk_bulk_get_all() will already have printed a more useful/specific
error message. Unfortunately will not be carried as the deferred probe
reason, but this error will just indicate that some clock controller
wasn't ready...

TL;DR I think we should just drop the error print from here instead.

Regards,
Bjorn