On Wed, 14 Jan 2004, David Brownell wrote: > > No, no! The URB's Axel is seeing are not being sent to his device; they > > are root hub status queries. Normally these don't show up very much > > That would make sense (HZ/4) but that wasn't clear from his message.
It would have been clearer if you had seen that sort of thing happen many times before, as I have (unfortunately). > Sounds just like one of those issues you were looking at in terms of > upcoming reset/disconnect patches, now that you mention it ... :) Actually it's more closely related to the idea of having khubd use subsidiary threads to handle connects and disconnects. A long-running disconnect routine wouldn't block the main khubd thread, leaving it free to respond to status change reports. > I wonder if it'd be useful to add some selective URB tracing machinery > into usbcore. At the level of: atomic_set some device flag to turn > on some level of submit/giveback dev_*() tracing for urbs going to that > device (or interface). Probably with a sysfs API too. > > There could be a "verbose" tell-all setting, and there could be a > mode that'd only show the fault report/recovery paths (zero volume > in normal usage, so safe to leave on most of the time). > > I suspect that having such standardized debug/trace information > would make some kinds of remote troubleshooting a lot easier ... That seems like a good idea to me. On the other hand, I recall Greg KH stating not too long ago that with an open-source system such as Linux you really don't need any way to trace things like USB messages... :-) Alan Stern ------------------------------------------------------- This SF.net email is sponsored by: Perforce Software. Perforce is the Fast Software Configuration Management System offering advanced branching capabilities and atomic changes on 50+ platforms. Free Eval! http://www.perforce.com/perforce/loadprog.html _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
