Re: [linux-usb-devel] ohci mouse lockups on National Geode system

[Patrik Stähli]

David Brownell wrote:
>
>> Further investigations (making procfs outputs from usb-ohci) have
>> uncovered that the 'Skip' flag for the frozen usb mouse is set even
>> though there are still transfer descriptors pending.
>
> Descriptors, multiple? My initial guess is that you're getting
> bit by one of the unlink bugs. High interrupt load means high
> latencies ... and some of the bugs fixed would absolutely goof
> up "usb-ohci" as latencies climbed, specifically on unlink paths.
>
> (But why were you having multiple descriptors with a mouse?)

I have to say that I did not check if there are really multiple transfer descriptors, but I know that there is at least one (start and end pointer in ED are not the same...). So probably there is really only one.

I will definitely try to backport the 2.5 usb-ohci driver and see if that helps. If it fixes my problem, I will certainly get back with the patch.

thanks a lot
/Patrik



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