linux-kernel - Re: [RFC PATCH] software node: Skip duplicated software

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Date:   Mon, 8 Nov 2021 20:06:26 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Qian Cai <quic_qiancai@...cinc.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] software node: Skip duplicated software_node sysfs

On Mon, Nov 08, 2021 at 11:07:53AM -0500, Qian Cai wrote:
> On 11/5/21 3:39 PM, Andy Shevchenko wrote:
> >> Andy, thanks for the pointers so far. I was able to trace
> >> set_primary_fwnode() and set_secondary_fwnode().
> > 
> > Can you share the trace you have got?

...

> Then, here are the relevant outputs indicating that
> "808622B7:01" and  "xhci-hcd.3.auto" have the same
> primary but different secondaries.

So, it confirms my theory if I'm not mistaken.

Btw, what you can do in this case is to switch to use fwnode_create_software
node and switch them in drd.c. It will be much much easier to achieve then
full kernel refactoring.

> [   11.233280] KK set_secondary_fwnode dev name = 808622B7:01, fwnode = ffff000838618840
> [   11.241846] KK parent = platform
> [   11.245790] KK primary = ffff0008064b9010
> [   11.259838] KK set_primary_fwnode dev name = (null), fwnode = ffff0008064b9010
> [   11.267795] KK parent = 808622B7:01
> [   11.272000] KK fwnode->dev = 808622B7:01
> [   11.276636] KK secondary = ffff000838618840
> [   11.680489] KK set_secondary_fwnode dev name = xhci-hcd.3.auto, fwnode = ffff000838325040
> [   11.689406] KK parent = 808622B7:01
> [   11.693916] KK primary = ffff0008064b9010
> [   11.698763] sysfs: cannot create duplicate filename '/devices/platform/808622B7:01/xhci-hcd.3.auto/software_node'

-- 
With Best Regards,
Andy Shevchenko