RE: [PATCH 4/4] usb: xhci: rework root port wake bits if controller isn't allowed to wakeup

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From: Felipe Balbi
> 
> On Fri, Nov 14, 2014 at 07:23:52PM +0200, Mathias Nyman wrote:
> > From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
> >
> > When system is being suspended, if host device is not allowed to do wakeup,
> > xhci_suspend() needs to clear all root port wake on bits. Otherwise, some
> > platforms may generate spurious wakeup, even if PCI PME# is disabled.
> >
> > The initial commit ff8cbf250b44 ("xhci: clear root port wake on bits"),
> > which also got into stable, turned out to not work correctly and had to
> > be reverted, and is now rewritten.
> >
> > Cc: stable <stable@xxxxxxxxxxxxxxx>
> 
> how far back ? Apparently, also, 2.6.37+

Isn't xhci completely broken before some relatively recent kernel?
ISTR a massive USB/xhci patch that a lot of things depend on.
Is it worth backporting to kernels without that patch?

	David



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