Hi Alan, Alan Stern wrote: > On Sat, 9 Dec 2006, matthieu castet wrote: > >> Alan Stern wrote: >>> On Fri, 13 Oct 2006, matthieu castet wrote: >>>> Yes may be it depends of the usb device. I didn't see any problem with a >>>> usb mass storage. >>> Can you try using the troublesome device on a different computer? >>> Preferably with the same kind of motherboard? >>> >> I tried the device on a computer using 2.6.19 and a NEC EHCI controller >> (upd720102), and I got the same problem. >> >> Seems the bug is not in the usb host hardware. > > Can you provide more detailed debugging information for the NEC > controller, like what you did before? Sorry I can't do this now. I may be do it in January.
> Maybe also try adding printk > statements to the beginning and end of the ehci_endpoint_disable() routine > in ehci-hcd.c, so we can see if that routine is hanging. IIRC, the old trace (via one) say it was hanging in ehci_endpoint_disable. Can't we add a counter to avoid looping forever (rescan -> case QH_STATE_UNLINK -> rescan). On which event we leave QH_STATE_UNLINK state ? Is it a sw or hw event ? Matthieu PS : BTW on via controller, there sometimes lost irq errors. ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
