linux-kernel - RE: [PATCH] PM / runtime: Drop children check from __pm_runtime_set

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Date:   Tue, 5 Dec 2017 03:23:06 +0000
From:   Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
CC:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux PM <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        "USB list" <linux-usb@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Kishon Vijay Abraham I <kishon@...com>
Subject: RE: [PATCH] PM / runtime: Drop children check from
 __pm_runtime_set_status()

Hi,

> From: Ulf Hansson, Sent: Monday, December 4, 2017 7:41 PM
> 
> On 1 December 2017 at 12:03, Yoshihiro Shimoda
> <yoshihiro.shimoda.uh@...esas.com> wrote:
<snip>
> > Sure! I tested your patch, and then the following message disappeared!
> >
> >    Enabling runtime PM for inactive device (ee080200.usb-phy) with active children
> 
> Great, that confirms my theory.
> 
> I will re-work the patch and re-post it to see what people thinks about it.

Thank you!

> >
> > However, the following message still exists.
> >
> >    Enabling runtime PM for inactive device (ee080000.usb) with active children
> >
> > So, I guess ohci-platform.c also has similar issue.
> 
> Yes, very likely!
> 
> However, I need some more time to look into this to be able to suggest
> a solution.

I found a solution and sent a report as below:
https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1551146.html

What do you think about using pm_runtime_forbid()?

Best regards,
Yoshihiro Shimoda