On Wed, Jul 31, 2013 at 4:48 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > On Tue, 30 Jul 2013, Alan Stern wrote: > >> I can try to ameliorate the situation. Although the 7-ms delay will >> inevitably cause an underrun, it doesn't have to cause errors the way >> it does now. I'll write a patch to handle this. It may take a few >> days. > > James, see what happens with this patch. It will print a warning > message in the system log every time it detects an underrun, but it > won't cause an URB submission failure any more. > OK - I will try it, however, it seems a bit like papering over the cracks without really understanding what's causing the error.. I just managed to induce another cannot submit URB bug, and there is definitely nothing written to trace around the time of this bug, with the settings: echo 0 > options/function-trace echo irqsoff > current_tracer echo 1 > tracing_on echo 0 > tracing_max_latency James -- 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
