Alan Stern [off-list ref]

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).

quoted

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


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