linux-kernel - Re: [PATCH 1/2] platform/x86: wmi: prefix sysfs files in /sys/bus/wmi with the ACPI device

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Date:   Sat, 9 Dec 2017 03:41:00 +0000
From:   <Mario.Limonciello@...l.com>
To:     <luto@...capital.net>
CC:     <dvhart@...radead.org>, <andy.shevchenko@...il.com>,
        <linux-kernel@...r.kernel.org>,
        <platform-driver-x86@...r.kernel.org>, <luto@...nel.org>
Subject: Re: [PATCH 1/2] platform/x86: wmi: prefix sysfs files in /sys/bus/wmi
 with the ACPI device

>> On Dec 8, 2017, at 6:34 PM, Mario Limonciello <mario.limonciello@...l.com> wrote:
>>
>> It's possible for the same GUID to show up on as system twice.
>> This means using solely the GUID for identify the file will not
>> be sufficient.
>
>Isn't the file already in a per-bus directory?

Yep, but the symlink created in /sys/bus/wmi/devices isn't.
That's where the kernel complains about duplicate sysfs
attributes.

It's not exactly a pretty path I submitted, but it does avoid
those collisions.

Example (with this in place from /sys/bus/wmi/devices):
lrwxrwxrwx 1 root root 0 Dec  8 21:39 PNP0C14:04-70FE8229-D03B-4214-A1C6-1F884B1A892A -> ../../../devices/platform/PNP0C14:04/wmi_bus/wmi_bus-PNP0C14:04/PNP0C14:04-70FE8229-D03B-4214-A1C6-1F884B1A892A