On Wed, 11 Feb 2015, Dave Mielke wrote: > [quoted lines by Alan Stern on 2015/02/11 at 10:54 -0500] > > >> I just reverified. It's definitely returning -1 with EAGAIN. > > > >That indicates the device is connected and the URB is still in > >progress. You can't reap it because it hasn't completed. The signal > >you received must have referred to a different URB. > > there's only one urb. The code actually verifies this by comparing the address > of the reaped urb to the one that was submitted. In this case, however, reaping > is failibng so it doesn't get that far. Could the signal be arriving too early? As far as I can see, there's no way to receive the signal until the URB completes, at which point REAP will work. Hmmm. In addition to usbmon, you can try writing 1 to /sys/module/usbcore/parameters/usbfs_snoop and then seeing what shows up in the dmesg log. 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
