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:   Fri, 6 Jul 2018 16:00:40 -0700
From:   Darren Hart <dvhart@...radead.org>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Mario Limonciello <Mario.Limonciello@...l.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>
Subject: Re: [PATCH 1/2] platform/x86: wmi: prefix sysfs files in
 /sys/bus/wmi with the ACPI device

On Sat, Dec 09, 2017 at 01:32:29PM -0800, Andy Lutomirski wrote:
> 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?
> 

Mario,

This one has been lingering at the bottom of my patch stack for a while now -
sorry for not poking on this earlier. Is this still something you have a need
for?

If so, would you resend and add Greg to Cc - specifically directing Andy's
question above to him?

-- 
Darren Hart
VMware Open Source Technology Center