linux-kernel - Re: [PATCH v2] usbip: convert to use faux

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Message-ID: <2025070949-activist-mammal-b806@gregkh>
Date: Wed, 9 Jul 2025 12:06:57 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Zongmin Zhou <min_halo@....com>
Cc: Shuah Khan <skhan@...uxfoundation.org>, shuah@...nel.org,
	valentina.manea.m@...il.com, i@...ithal.me,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	zhouzongmin@...inos.cn
Subject: Re: [PATCH v2] usbip: convert to use faux_device

On Wed, Jul 09, 2025 at 05:07:24PM +0800, Zongmin Zhou wrote:
> > > In fact, I've experimented with adding PM hooks to the faux bus,
> > > and found that faux bus devices then behave identically to platform
> > > bus devices during suspend/resume.
> > > See the attachment.
> > > 
> > 
> > Thanks for checking this scenario. No surprises here.
> Another part of my purpose in doing this is that the vhci-hcd driver seems
> should still retain suspend/resume hooks. Therefore, the faux bus should
> add corresponding hooks to allow the driver to call its own pm functions.
> Though currently don't know how to fix this problem yet.

I have no problem with adding the pm functions to the faux bus, BUT it
needs to make sense as to why they would be needed at all as this is not
a "real" device or bus that should need to do anything when
suspend/resume happens.

thanks,

greg k-h