On Tue, 1 Apr 2014 09:30:01 -0400 (EDT), Alan Stern wrote: > On Tue, 1 Apr 2014, Dennis New wrote: > > > I was able to capture usbmon output during the event (via a > > continuously rotating set of log files over a few days :p) from: > > /sys/kernel/debug/usb/usbmon/3u > > Were you using a kernel with the patch that I sent you? Did you have > CONFIG_USB_DEBUG enabled? Did any of the debugging information show > up in the kernel log? Ugh. I forgot to apply the patch that time. I'll do that now. Apologies. > [...] > This indicates that the OHCI host controller just stopped working. > Then about a minute later, the audio device disconnected. Yep, that's what happened. I manually disconnected the usb audio device though. And then tried plugging it back in, but got no response. > [...] > > > hcca frame 0xd466 > > After the crash, did you notice whether the hcca frame value was > changing over time? I will check for this next time! (At the moment, it seems to increment a lot each time I cat the "registers" file.) > [...] > I don't know that much can be done to prevent the controller from > crashing, or to recover from such a crash. Maybe resetting the > controller would work, maybe not. > > But at least it should be possible to insure that a controller > malfunction doesn't bring down the entire USB stack with it. I will > work on a patch for this, but I'm going to be quite busy with other > matters for the next few days. It may take some time to get the patch > ready for you to test. > > Alan Stern I appreciate your work! -- 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
