On Wed, 29 Jul 2009, Matthijs Kooijman wrote: > Hi Alan, > > I've applied the patch you've sent in the other thread. It seems to work > properly, I'm no longer seeing the DMA errors in my logs. Great! > I do still see some > XactErrs when unplugging the device, but those are probably to be expected > when unplugging a device. It seems this issue is resolved for me, then? Sounds like it, yes. > The other issue I was having, with my tablet generating errors seems to be > traceable to my new USB hub. I have no such problems with another hub. The new > hub consists of two nested four port hubs, giving one 7 port hub, where the > problem only occurs when using the inner hub. I'll try the hub on another > os or kernel version to double check the hardware. > > Another thing I was seeing just now, is XactErrs when nothing is plugged into > the (possibly faulty) hub. Interestingly enough, the retry counts there were > negative, starting with -223. Looking at the code, I'm not so sure if this is > supposed to happen. It seems that the qh->xacterrs variable is somehow large > (255, since the retry count is 32 - xacterrs). This smells like an overflow, > which probably shouldn't happen. It certainly shouldn't. Can you provide the dmesg log? > I'll dig into this issue a bit more, probably in another thread (unless you > think they are related?). I doubt they are related, unless somehow this patch causes a QH to be freed too early. I'll have to see the log to be sure. > Anything else you need from me to confirm the patch is ok? Nothing else at the moment. Thanks for testing. 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
