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

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Date:	Sat, 01 Nov 2014 23:23:44 +0530
From:	Neelesh Gupta <neelegup@...ux.vnet.ibm.com>
To:	Guenter Roeck <linux@...ck-us.net>,
	Jean Delvare <jdelvare@...e.de>,
	Michael Ellerman <mpe@...erman.id.au>
CC:	lm-sensors@...sensors.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] hwmon: (ibmpowernv) Quieten when probing finds no
 device


On 10/31/2014 06:51 PM, Guenter Roeck wrote:
> 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@...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;
>>>       }
>>>
>>
>> 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.

The parent 'sensors' node doesn't have a compatible property, rather 
individual
child sensors have. So, instead we can introduce 
'platform_driver.id_table' for
the probe.

Thanks,
Neelesh

>
> Guenter
>
>> Reviewed-by: Jean Delvare <jdelvare@...e.de>
>>
>

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