On Sunday 05 August 2007, David Brownell wrote: > > > 2007-08-05_10:30:27.75572 kern.err: > > > ehci_hcd 0000:00:1d.7: dev 6 ep1in scatterlist error 0/-121 > > That's rather strange since it means a *success* (urb->status 0) was > reported after a short read (scatterlist status -120, -EREMOTEIO).
I'm baffled by that also. It should never happen. > The hardware should have stopped queue processing after the short > read, because of how qtd->hw_alt_next gets set up ... at least, > that's how I remember it, these many years after writing that code. > > It might be that because of the issue noted below, it was wrongly > restarted by the software. > > > > > 2007-08-05_10:30:27.86576 kern.info: usb 1-6: reset high speed USB device > > > using \ > > > ehci_hcd and address 5 2007-08-05_10:30:55.95293 kern.info: usb 1-6: USB \ > > > disconnect, address 5 2007-08-05_10:30:55.95300 kern.err: > > > ehci_hcd 0000:00:1d.7: dev 6 ep1in scatterlist error -108/-108 > > That one just means nobody updated that test to recognize that > the -ESHUTDOWN (-108) triggered after disconnect is a "clean" > failure like the ones triggered by unlinking. > > However it also indicates that something changed in the unlink > code paths, since I see the *expected* code (-ECONNRESET) is no > longer being set by usbcore during unlinks ... What do you mean? Normal async unlinks still use that error value. Look at the usb_unlink_urb() routine in core/urb.c. > it's not quite > clear to me what else that change will have broken. Including > whether that might not explain how the hardware queue got wrongly > restarted after the short read above. Could there have been a change in the unlink or completion code in ehci-hcd? Alan Stern ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
