linux-kernel - Re: ipheth: fix EOVERFLOW in ipheth_rcvbulk

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Message-Id: <FF6FFC1F-0AE9-4253-B55E-755BB90C4DBA@abv.bg>
Date:   Mon, 31 Jan 2022 23:43:52 +0200
From:   Georgi Valkov <gvalkov@....bg>
To:     Jan Kiszka <jan.kiszka@...mens.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>, davem@...emloft.net,
        mhabets@...arflare.com, luc.vanoostenryck@...il.com,
        snelson@...sando.io, mst@...hat.com, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        corsac@...sac.net, matti.vuorela@...factor.fi,
        stable@...r.kernel.org
Subject: Re: ipheth: fix EOVERFLOW in ipheth_rcvbulk_callback

> On 2022-01-31, at 7:35 PM, Jan Kiszka <jan.kiszka@...mens.com> wrote:
> 
> On 31.01.22 18:27, Jakub Kicinski wrote:
>> On Mon, 31 Jan 2022 10:45:23 +0100 Jan Kiszka wrote:
>>> On 20.07.21 15:12, Georgi Valkov wrote:
>>>> Thank you, Greg!
>>>> 
>>>> git send-email drivers/net/0001-ipheth-fix-EOVERFLOW-in-ipheth_rcvbulk_callback.patch
>>>> ...
>>>> Result: OK
>>>> 
>>>> I hope I got right. I added most of the e-mail addresses, and also tried adding Message-Id.
>>>> I have not received the e-mail yet, so I cannot confirm if it worked or not.
>>>>   
>>> 
>>> What happened here afterwards?
>>> 
>>> I just found out the hard way that this patch is still not in mainline
>>> but really needed.
>> I have not seen the repost :(
> 
> Would it help if I do that on behalf of Georgi? Meanwhile, I can add a tested-by to it, after almost a full working day with it applied.

Yes, please do it! The faster it gets mainline, the more people will benefit from the fix. As far as I recall, some months ago someone asked me to submit the patch using git mail or something like that, which I did for the first time. It command reported success, but I did not get any replays since then from anyone. I intended to resubmit it the following week, but got overwhelmed by tasks, and the time passed. Meanwhile I still keep the patch in GitHub/httpstorm/openwrt, brach gvalkov. No changes are required since the original e-mail, so it can be submitted to mainline.

There is another issue with my iPhone 7 Plus, which is unrelated to this patch:
If an iPhone is tethered to a MacBook, the next time it gets connected to an OpenWRT router the USB Ethernet interface appears, but there is no communication. Hence I would assume this unrelated issue also has to be fixed in another patch. I can confirm that in this state macOS and Windows are able to use USB tethering, only OpenWRT is affected. So far I found the following workarounds:
* reboot the phone or run:
* usbreset 002/002 && /etc/init.d/usbmuxd restart

The same happens if the phone reboots due to extreme cold temperatures while tethered. Finally there is also a bug or possible hardware/baseband fault in my phone where every few days the modem reboots: the LTE icon disappears for a few seconds, and tethering is turned off. Either way, running the commands mentioned above re-enable tethering and restore the communication instantly. It would be nice if a watchdog is integrated in ipheth to trigger recovery automatically.

Georgi Valkov

> Jan
> 
> -- 
> Siemens AG, Technology
> Competence Center Embedded Linux
>