Re: 31-rc3-mmotm0716 - dead USB trackball mouse kills entire system

[Alan Stern]

On Mon, 27 Jul 2009 Valdis.Kletnieks@xxxxxx wrote:

> Confirming - the patch in that thread prevents the system lockup I was
> seeing.
> 
> So it looks like hid_reset() getting more chatty sometime in the last 2 weeks
> was a red herring, and one I can't actually complain about - it was quite
> legitimately whinging about not being able to reset a device that was in fact
> dead in the water at the time.  Given that, and a working patch for ehci-hcd.c,
> I'm having a hard time finding the enthusiasm to track down what exactly
> changed in hid-core.c. :)
> 
> The change in hid-core.c behavior just had the bad luck to land in -mmotm at
> the exact same time the bug in ehci-hcd.c landed.  So we had two user-visible
> behavior changes in the same area of code at the same time.  Hilarity ensues. :)
> 
> Thanks for pointing me at the actual fix. ;)

A question for you: Do you now observe any warnings in the dmesg log if
you rmmod ehci-hcd after the trackball mouse is gone?  Apparently the 
patch you tested isn't perfect and some stuff gets leaked.  I'm trying 
to track down the problem.

Alan Stern

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