linux-kernel - Re: regression in 2.6.27.45 with usb and suspend-to-disk

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Message-Id: <20100203134755.a56e2314.undefined@pobox.com>
Date:	Wed, 3 Feb 2010 13:47:55 -0600
From:	Corey Wright <undefined@...ox.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Greg KH <gregkh@...e.de>, <stable@...nel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: regression in 2.6.27.45 with usb and suspend-to-disk

On Wed, 3 Feb 2010 13:09:45 -0500 (EST)
Alan Stern <stern@...land.harvard.edu> wrote:

> On Wed, 3 Feb 2010, Corey Wright wrote:
> 
> > > Please build a kernel with CONFIG_USB_DEBUG enabled and post a dmesg 
> > > log showing the problem during the second hibernation attempt.
> > 
> > [  675.443474] PM: Syncing filesystems ... done.
> > [  675.576353] Freezing user space processes ... (elapsed 0.00 seconds)
> > done.
> > [  675.606968] Freezing remaining freezable tasks ... (elapsed 0.00
> > seconds) done.
> > [  675.629249] PM: Shrinking memory...  .-.\.|.done (3129 pages freed)
> > [  679.547522] PM: Freed 12516 kbytes in 3.90 seconds (3.20 MB/s)
> > [  679.565065] Suspending console(s) (use no_console_suspend to debug)
> > [  679.585425] uhci_hcd 0000:00:10.0: release dev 2 ep81-INT, period 8,
> > phase 4, 118 us
> > [  679.585453] hub 2-0:1.0: hub_suspend
> > [  679.585460] usb usb2: bus suspend
> > [  679.585463] usb usb2: suspend_rh
> > [  679.585534] hub 1-0:1.0: hub_suspend
> > [  679.585538] usb usb1: bus suspend
> > [  679.585542] ehci_hcd 0000:00:10.4: suspend root hub
> > [  679.585547] ehci_hcd 0000:00:10.4: suspend failed because port 8 is
> > resuming
> 
> There you have it.  What is the USB device attached to port 8 on bus 1 
> (i.e., /sys/bus/usb/devices/1-8)?

the device is a usb SD reader w/ SD card in it.

# cat /sys/bus/usb/devices/1-8/product
USB 2.0  SD MMC READER 

i removed the media reader after the failed suspend (it is only used at
boot-up to hold the LUKS key material to decrypt the filesystem) but the
message is the same:

[ 4002.585329] ehci_hcd 0000:00:10.4: suspend root hub
[ 4002.585334] ehci_hcd 0000:00:10.4: suspend failed because port 8 is
resuming
[ 4002.585338] usb usb1: bus suspend fail, err -16

and /sys/bus/usb/devices/1-8 no longer exists (little
alone /sys/bus/usb/devices/1-8/power/wakeup):

# ls -1 /sys/bus/usb/devices/
1-0:1.0
1-7
1-7:1.0
2-0:1.0
2-1
2-1:1.0
3-0:1.0
4-0:1.0
5-0:1.0
usb1
usb2
usb3
usb4
usb5

> And what happens if you do:
> 
> 	echo disabled >/sys/bus/usb/devices/1-8/power/wakeup
> 
> before trying to hibernate?

it's the same immediately after a reboot (and before suspending), a
successful suspend, or a failed suspend:

# echo disabled >/sys/bus/usb/devices/1-8/power/wakeup 
bash: echo: write error: Invalid argument

and as previously said, that sysfs entry does not exist if the media reader
is removed, though the error appears to continue to refer to that
port/device.

corey
-- 
undefined@...ox.com
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