From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Greg KH <greg@kroah.com>
Cc: Peter Chen <peter.chen@freescale.com>,
gregkh@suse.de, linux-kernel@vger.kernel.org,
linux-pm@vger.kernel.org, stern@rowland.harvard.edu,
hzpeterchen@gmail.com
Subject: Re: [PATCH 1/1] driver core: disable device's runtime pm during shutdown
Date: Wed, 16 Nov 2011 00:16:08 +0100 [thread overview]
Message-ID: <201111160016.09174.rjw@sisk.pl> (raw)
In-Reply-To: <20111115005951.GB26360@kroah.com>
On Tuesday, November 15, 2011, Greg KH wrote:
> On Mon, Nov 14, 2011 at 11:27:37PM +0100, Rafael J. Wysocki wrote:
> > On Monday, November 14, 2011, Peter Chen wrote:
> > > There may be an issue when the user issue "reboot/shutdown" command, then
> > > the device has shut down its hardware, after that, this runtime-pm featured
> > > device's driver will probably be scheduled to do its suspend routine,
> > > and at its suspend routine, it may access hardware, but the device has
> > > already shutdown physically, then the system hang may be occurred.
> > >
> > > I ran out this issue using an auto-suspend supported USB devices, like
> > > 3G modem, keyboard. The usb runtime suspend routine may be scheduled
> > > after the usb controller has been shut down, and the usb runtime suspend
> > > routine will try to suspend its roothub(controller), it will access
> > > register, then the system hang occurs as the controller is shutdown.
> > > Signed-off-by: Peter Chen <peter.chen@freescale.com>
> >
> > Greg, do you want me to take this one?
>
> Please do:
> Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Done, thanks!
Rafael
next prev parent reply other threads:[~2011-11-15 23:13 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-14 0:43 [PATCH 1/1] driver core: disable device's runtime pm during shutdown Peter Chen
2011-11-14 9:54 ` Ming Lei
2011-11-14 22:28 ` Rafael J. Wysocki
2011-11-14 22:27 ` Rafael J. Wysocki
2011-11-15 0:59 ` Greg KH
2011-11-15 23:16 ` Rafael J. Wysocki [this message]
2011-12-04 21:56 ` NeilBrown
2011-12-05 2:42 ` Alan Stern
2011-12-05 3:37 ` NeilBrown
2011-12-05 3:26 ` Ming Lei
2011-12-05 4:42 ` Chen Peter-B29397
2011-12-05 5:12 ` Ming Lei
2011-12-05 9:01 ` Ming Lei
2011-12-05 9:05 ` Ming Lei
2011-12-05 16:02 ` Alan Stern
2011-12-05 18:35 ` NeilBrown
2011-12-05 20:55 ` Alan Stern
2011-12-05 22:32 ` Rafael J. Wysocki
2011-12-06 15:26 ` [PATCH] Driver core: leave runtime PM enabled during system shutdown Alan Stern
2011-12-06 21:34 ` NeilBrown
2011-12-06 21:48 ` Greg KH
2011-12-06 22:05 ` Rafael J. Wysocki
2011-12-06 22:03 ` Rafael J. Wysocki
2011-12-05 4:53 ` [PATCH 1/1] driver core: disable device's runtime pm during shutdown NeilBrown
2011-12-05 5:53 ` Chen Peter-B29397
2011-12-05 8:08 ` NeilBrown
2011-12-05 8:32 ` Chen Peter-B29397
2011-12-05 8:52 ` NeilBrown
2011-12-05 3:29 ` Chen Peter-B29397
2011-12-05 5:09 ` NeilBrown
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