On Thu, 23 Jul 2009, Manuel Lauss wrote: > 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. > > On the other hand, 2.6.30 even with the IO watchdog disabled doesn't > show the error. Did you disable only the I/O watchdog, or did you also disable the IAA watchdog? Has there been a chance to run the new test I asked about? The fact that the ACM device doesn't work when you plug it back in after reloading ehci-hcd suggests that the khubd thread has gotten stuck waiting for womething. You can confirm this by getting a stack trace (Alt-SysRq-T) after removing ehci-hcd. I would guess that khubd is waiting for the URB that is still sitting in the DMA pools. 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
