On Thu, 23 Jul 2009, Manuel Lauss wrote: > > Run your test again, without usbmon. But before removing ehci-hcd, > > mount a debugfs filesystem and look in the usb/ehci/au1xxx-ehci.0 > > directory. There should be a bunch of files with names like > > "registers", "async", and "periodic"; let's see what they contain. > > Debug output is here: http://mlau.at/au1xxx-ehci-trace-b.txt > > However I think this is entirely my fault: In an effort to reduce idle wakeups > I disabled the EHCI IO watchdog (which reduced idle wakeups by ~10/s). > Enabling it again gets rid of the WARN_ON output without any patching. I don't know... The I/O watchdog should not be needed. It's there only as a backup, in case something else goes wrong. > On the other hand, 2.6.30 even with the IO watchdog disabled doesn't > show the error. Yeah. Try this: Leave the watchdog disabled and leave the qh_completions() call in place. After plugging in the device, start and exit minicom. Then get a copy of the "async" file ("registers" and "periodic" don't matter). Then unplug the device and get another copy of "async". Finally, do the rmmod. I'll try doing some testing of my own. I don't have a CDC-ACM device, but I can try other things. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
