Re: [PATCH] r8152: stop submitting rx for -EPROTO

From: Jason-ch Chen
Date: Wed Sep 29 2021 - 05:52:46 EST

On Wed, 2021-09-29 at 08:14 +0000, Hayes Wang wrote:
> Jason-ch Chen <jason-ch.chen@xxxxxxxxxxxx>
> > Sent: Wednesday, September 29, 2021 1:18 PM
> [...]
> > When unplugging RTL8152 Fast Ethernet Adapter which is plugged
> > into an USB HUB, the driver would get -EPROTO for bulk transfer.
> > There is a high probability to get the soft/hard lockup
> > information if the driver continues to submit Rx before the HUB
> > completes the detection of all hub ports and issue the
> > disconnect event.
> I don't think it is a good idea.
> For the other situations which return the same error code, you would
> stop the rx, too.
> However, the rx may re-work after being resubmitted for the other
> cases.
> Best Regards,
> Hayes
Hi Hayes,

Sometimes Rx submits rapidly and the USB kernel driver of opensource
cannot receive any disconnect event due to CPU heavy loading, which
finally causes a system crash.
Do you have any suggestions to modify the r8152 driver to prevent this
situation happened?