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

[Guenter Roeck]

On 10/31/2014 02:41 AM, Jean Delvare wrote:
> Hi Michael,
>
> On Fri, 31 Oct 2014 17:45:22 +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@xxxxxxxxxxxxxx>
> > ---
> >   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;
> >   	}
>
> Looks reasonable.
The reduced noise, ok, but a better fix would be to not attempt to load
the driver in the first place. This should be doable by introducing an
of_match_table.

Guenter

> Reviewed-by: Jean Delvare <jdelvare@xxxxxxx>

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