Re: [bug report} wifi: mt76: mt7612u/mt7610u - 6.1.x hard locking systems

From: Lorenzo Bianconi <lorenzo@kernel.org>
To: Nick Morrow <morrownr@gmail.com>
Cc: nbd@nbd.name, ryder.lee@mediatek.com, shayne.chen@mediatek.com,
	Sean Wang <sean.wang@mediatek.com>,
	deren.wu@mediatek.com, linux-wireless@vger.kernel.org,
	linux-mediatek@lists.infradead.org
Subject: Re: [bug report} wifi: mt76: mt7612u/mt7610u - 6.1.x hard locking systems
Date: Tue, 27 Dec 2022 13:05:19 +0100	[thread overview]
Message-ID: <Y6rffzYy5hgIQKSE@localhost.localdomain> (raw)
In-Reply-To: <CAFktD2fbpUv9X5MY1jozyXoxvNXW=4OfaJ3B1KcZtdrBfiG4NA@mail.gmail.com>

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> > > Starting with kernel 6.1 rc1, mt7612u and mt7610u are hard locking
> > > systems when connection is established. From a report this morning:
> > >
> > > "So I'm using a MT7610U based adapter and updated to 6.1.1 in Arch
> > > Linux and it's a complete lockup a few seconds after connecting as
> > > other people have said, I'll use the LTS kernel (5.15) in the
> > > meanwhile but this is probably going to get a lot of people that use
> > > distros with newer kernels."
> > >
> > > Background: Problem first discovered with kernel 6.1 rc1. Bug report
> > > was seen on linux-wireless around the rc5 timeframe. This is an
> > > additional bug report.
> > >
> > > I don't think additional info is needed as I have tested on several
> > > distros with various RC's of 6.1 and the problem is 100% reproducible
> > > and unavoidable. This is a show stopper bug and will result in
> > > widespread reports as distros upgrade to kernel 6.1.
> > >
> > > Regards,
> >
> > Hi Nick,
> >
> > Can you please try the patch below?
> > https://patchwork.kernel.org/project/linux-wireless/patch/20221217085624.52077-1-nbd@nbd.name/
> >
> > Regards,
> > Lorenzo
> 
> Lorenzo,
> 
> Today, I downloaded kernel 6.1.1, applied the above patch and
> compiled. Once installed, I tested with an Alfa ACM mt7612u based
> adapter. I no longer see the problem. No system lockups at all. iperf3
> is showing a consistent performance of around 387 Mb/s. dmesg is
> clean. The patch appears to have fixed the issue. I can also test with
> a mt7610u based adapter if you think it is necessary but since that
> patch was not to mt76, I decided testing only with the mt7612u adapter
> was probably good enough. Let me know if there is anything else I can
> do.

no, it is not necessary to test with mt7610u as well. Thanks for testing.

Regards,
Lorenzo

> 
> Nick
> https://github.com/morrownr/USB-WiFi

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