linux-kernel - Re: [PATCH 1/2] hwmon: (ibmpowernv) Quieten when probing finds no device

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Date:	Fri, 31 Oct 2014 06:12:33 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Michael Ellerman <mpe@...erman.id.au>, jdelvare@...e.de
CC:	lm-sensors@...sensors.org, linux-kernel@...r.kernel.org,
	neelegup@...ux.vnet.ibm.com
Subject: Re: [PATCH 1/2] hwmon: (ibmpowernv) Quieten when probing finds no
 device

On 10/30/2014 11:45 PM, Michael Ellerman wrote:
> Because we build kernels with drivers built in for many platforms, it's
> normal for the ibmpowernv driver to be loaded on systems that don't have
> the appropriate hardware.
>
> Currently the driver spams the log with:
>
>    ibmpowernv ibmpowernv.0: Opal node 'sensors' not found
>    ibmpowernv: Platfrom driver probe failed
>
> But there is no error, this machine is not a powernv and doesn't have
> the hardware. So change the sensors message to dev_dbg(), and only print
> an error about the probe failing if it's not ENODEV.
>

Then it should be built as module and not be loaded. Why is it loaded
on your platform ?

Guenter

> Also fix the spelling of "Platfrom" and print the actual error value.
>
> Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
> ---
>   drivers/hwmon/ibmpowernv.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/hwmon/ibmpowernv.c b/drivers/hwmon/ibmpowernv.c
> index d2bf2c97ae70..6a30eeea94be 100644
> --- a/drivers/hwmon/ibmpowernv.c
> +++ b/drivers/hwmon/ibmpowernv.c
> @@ -181,7 +181,7 @@ static int __init populate_attr_groups(struct platform_device *pdev)
>
>   	opal = of_find_node_by_path("/ibm,opal/sensors");
>   	if (!opal) {
> -		dev_err(&pdev->dev, "Opal node 'sensors' not found\n");
> +		dev_dbg(&pdev->dev, "Opal node 'sensors' not found\n");
>   		return -ENODEV;
>   	}
>
> @@ -335,7 +335,9 @@ static int __init ibmpowernv_init(void)
>
>   	err = platform_driver_probe(&ibmpowernv_driver, ibmpowernv_probe);
>   	if (err) {
> -		pr_err("Platfrom driver probe failed\n");
> +		if (err != -ENODEV)
> +			pr_err("Platform driver probe failed (%d)\n", err);
> +
>   		goto exit_device_del;
>   	}
>
>

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