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 13:32:29 -0800
From:   Andy Lutomirski <luto@...nel.org>
To:     Mario Limonciello <Mario.Limonciello@...l.com>
Cc:     Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Andrew Lutomirski <luto@...nel.org>
Subject: Re: [PATCH 1/2] platform/x86: wmi: prefix sysfs files in /sys/bus/wmi
 with the ACPI device

On Fri, Dec 8, 2017 at 7:41 PM,  <Mario.Limonciello@...l.com> wrote:
>>> 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

Right, I saw that in the cover letter right after sending this.

Greg, is there a cleaner way to deal with this?  There are two
instances of the same bus type, each of which would like to have a
device called "70FE8229-D03B-4214-A1C6-1F884B1A892A".  Can we somehow
rename the symlinks without renaming the device, or are we just
supposed to prefix the device name like Mario is doing here?