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From:   Kalle Valo <kvalo@codeaurora.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc:     Greg KH <gregkh@linuxfoundation.org>,
        Bhaumik Bhatt <bbhatt@codeaurora.org>,
        Loic Poulain <loic.poulain@linaro.org>,
        ath11k@lists.infradead.org, linux-wireless@vger.kernel.org,
        regressions@lists.linux.dev, stable@vger.kernel.org
Subject: Re: [regressions] ath11k: v5.12.3 mhi regression
References: <87v97dhh2u.fsf@codeaurora.org> <YKYzwBJNTy4Czd1A@kroah.com>
        <20210520104313.GA128703@thinkpad>
Date:   Thu, 20 May 2021 15:36:00 +0300
In-Reply-To: <20210520104313.GA128703@thinkpad> (Manivannan Sadhasivam's
        message of "Thu, 20 May 2021 16:13:13 +0530")
Message-ID: <87r1i1h9an.fsf@codeaurora.org>
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Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> writes:

> On Thu, May 20, 2021 at 12:02:40PM +0200, Greg KH wrote:
>> On Thu, May 20, 2021 at 12:47:53PM +0300, Kalle Valo wrote:
>> > Hi,
>> > 
>> > I got several reports that this mhi commit broke ath11k in v5.12.3:
>> > 
>> > commit 29b9829718c5e9bd68fc1c652f5e0ba9b9a64fed
>> > Author: Bhaumik Bhatt <bbhatt@codeaurora.org>
>> > Date:   Wed Feb 24 15:23:04 2021 -0800
>> > 
>> >     bus: mhi: core: Process execution environment changes serially
>> >     
>> >     [ Upstream commit ef2126c4e2ea2b92f543fae00a2a0332e4573c48 ]
>> > 
>> > Here are the reports:
>> > 
>> > https://bugzilla.kernel.org/show_bug.cgi?id=213055
>> > 
>> > https://bugzilla.kernel.org/show_bug.cgi?id=212187
>> > 
>> > https://bugs.archlinux.org/task/70849?project=1&string=linux
>> > 
>> > Interestingly v5.13-rc1 seems to work fine, at least for me, though I
>> > have not tested v5.12.3 myself. Can someone revert this commit in the
>> > stable release so that people get their wifi working again, please?
>> 
>> How does the mhi bus code relate to a ath11k driver?  What bus is that
>> on?
>> 
>
> MHI is the transport used by the ath11k driver to work with the WLAN devices
> over PCIe.
>
> Regarding the bug, I'd suggest to wait for Bhaumik (the author of 29b9829718c5)
> to comment on the possible commit which needs backporting from mainline.

Ok, but if a quick fix is not available I think we should just revert
this in the stable releases. I also got a report that v5.11.21 is
broken:

https://bugzilla.kernel.org/show_bug.cgi?id=213055#c11

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