linux-kernel - Re: [PATCH] net: dsa: set parent of hwmon device

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Message-ID: <CAGVrzcawAF1=RPAJ+0O3B+PA7sDkstTjVjDQL_8C8a8kHL7CoA@mail.gmail.com>
Date:	Tue, 20 Jan 2015 21:58:02 -0800
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
	netdev <netdev@...r.kernel.org>,
	"David S . Miller" <davem@...emloft.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	kernel@...oirfairelinux.com
Subject: Re: [PATCH] net: dsa: set parent of hwmon device

2015-01-20 19:50 GMT-08:00 Guenter Roeck <linux@...ck-us.net>:
> On 01/20/2015 04:13 PM, Vivien Didelot wrote:
>>
>> Set the dsa device as the parent of the hwmon device, in order to link
>> the hwmon subsystem under the corresponding /sys/devices/platform/dsa.X/
>> sysfs directory.
>>
>> Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
>> ---
>>   net/dsa/dsa.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
>> index 3731714..363102a 100644
>> --- a/net/dsa/dsa.c
>> +++ b/net/dsa/dsa.c
>> @@ -347,7 +347,7 @@ dsa_switch_setup(struct dsa_switch_tree *dst, int
>> index,
>>                 hname[j] = '\0';
>>                 scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name),
>> "%s_dsa%d",
>>                           hname, index);
>> -               ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
>> +               ds->hwmon_dev = hwmon_device_register_with_groups(parent,
>>                                         ds->hwmon_name, ds,
>> dsa_hwmon_groups);
>>                 if (IS_ERR(ds->hwmon_dev))
>>                         ds->hwmon_dev = NULL;
>>
>
> Looking into my old e-mail, turns out we did not add the parent device
> because
> it affected the output of the "sensors" command, and we wanted the device
> to be handled as 'virtual device' (which implies no parent). That was an
> explicit
> part of the patch set (v2 of 'net: dsa: Add support for reporting switch
> chip
> temperatures'), compared to v1, which did set the parent device.
>
> I would suggest to keep the code as is.

Maybe follow-up with a comment adding that above the call to
hwmon_device_register_with_groups()? I suspect the intent is clear if
you are deep into hwmon devices, but not necessarily for the reader ;)

>
> Thanks,
> Guenter
>
>
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-- 
Florian
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