RE: [PATCH] PM / runtime: Drop children check from __pm_runtime_set_status()

From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Linux PM <linux-pm@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Alan Stern <stern@rowland.harvard.edu>,
	"USB list" <linux-usb@vger.kernel.org>,
	Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
	Kishon Vijay Abraham I <kishon@ti.com>
Subject: RE: [PATCH] PM / runtime: Drop children check from __pm_runtime_set_status()
Date: Tue, 5 Dec 2017 03:23:06 +0000	[thread overview]
Message-ID: <TY1PR06MB0992214C75585618A1400A1CD83D0@TY1PR06MB0992.apcprd06.prod.outlook.com> (raw)
In-Reply-To: <CAPDyKFr4=Vct_-w1euOsEnb3WdeBvH9mz12zNTUfX7Z6nEwRuw@mail.gmail.com>

Hi,

> From: Ulf Hansson, Sent: Monday, December 4, 2017 7:41 PM
> 
> On 1 December 2017 at 12:03, Yoshihiro Shimoda
> <yoshihiro.shimoda.uh@renesas.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