linux-kernel - Re: [PATCH 1/1] xhci: clear root port wake on bits if controller isn't wake-up capable

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Message-ID: <5398FFDA.5050601@linux.intel.com>
Date:	Thu, 12 Jun 2014 09:18:18 +0800
From:	baolu <baolu.lu@...ux.intel.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Mathias Nyman <mathias.nyman@...el.com>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] xhci: clear root port wake on bits if controller
 isn't wake-up capable


On 06/11/2014 11:26 PM, Greg Kroah-Hartman wrote:
> On Wed, Jun 11, 2014 at 06:25:20AM +0800, Lu Baolu wrote:
>> When the xHCI PCI host is suspended, if do_wakeup is false in xhci_pci_suspend,
>> xhci_bus_suspend needs to clear all root port wake on bits. Otherwise some Intel
>> platform may get a spurious wakeup, even if PCI PME# is disabled.
>>
>> http://marc.info/?l=linux-usb&m=138194006009255&w=2
>>
>> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
>> ---
>>   drivers/usb/host/xhci-hub.c | 5 ++++-
>>   1 file changed, 4 insertions(+), 1 deletion(-)
> Should this also be a stable kernel patch?  If so, how far back?
Yes.

This patch should be back-ported to kernels as old as 2.6.37, that
contains the commit 9777e3ce907d4cb5a513902a87ecd03b52499569
"USB: xHCI: bus power management implementation".

Thanks,
-baolu
>
> thanks,
>
> greg k-h
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