linux-kernel - RE: [PATCH] r8152: stop submitting rx for -EPROTO

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Date:   Mon, 4 Oct 2021 02:15:44 +0000
From:   Hayes Wang <hayeswang@...ltek.com>
To:     Alan Stern <stern@...land.harvard.edu>
CC:     Oliver Neukum <oneukum@...e.com>,
        Jason-ch Chen <jason-ch.chen@...iatek.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "Project_Global_Chrome_Upstream_Group@...iatek.com" 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        "hsinyi@...gle.com" <hsinyi@...gle.com>,
        nic_swsd <nic_swsd@...ltek.com>
Subject: RE: [PATCH] r8152: stop submitting rx for -EPROTO

Alan Stern <stern@...land.harvard.edu>
> 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