Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> > Sent: Friday, October 1, 2021 11:22 PM [...] > That's right. If the device and cable are working properly, this > should never happen. Or only extremely rarely (for example, caused > by external electromagnetic interference). > > > It seems to be reasonable why resubmission sometimes works. > > Did you ever track down the reason why you got the -EPROTO error > while debugging that other issue? Can you reproduce it? I didn't follow it, because it was not relative to the driver. Besides, we didn't focus on -EPROTO at that time, because it was not the major issue. And the -EPROTO occurred rarely indeed during a lot of transmission. The hw engineer confirmed that the device completed the transfer normally, but the driver still got an error from the host. I don't sure if there was a USB HUB between the device and the USB host controller. That are all what I know. Best Regards, Hayes
