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

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Date:	Fri, 31 Oct 2014 11:12:39 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Michael Ellerman <mpe@...erman.id.au>,
	Neelesh Gupta <neelegup@...ux.vnet.ibm.com>
Cc:	jdelvare@...e.de, 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 Fri, Oct 31, 2014 at 05:45:22PM +1100, 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.
> 
> Also fix the spelling of "Platfrom" and print the actual error value.
> 
> Signed-off-by: Michael Ellerman <mpe@...erman.id.au>

Neelesh,

is there a compatible property in the powernv devicetree which can be
used to identify the system ?

I am ok with applying this patch for the time being, but it would be better
if we can change the driver to only instantiate when actually needed.

Thanks,
Guenter

> ---
>  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;
>  	}
>  
> -- 
> 1.9.1
> 
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