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Date:   Thu, 20 May 2021 16:13:13 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
To:     Greg KH <gregkh@linuxfoundation.org>
Cc:     Kalle Valo <kvalo@codeaurora.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
Message-ID: <20210520104313.GA128703@thinkpad>
References: <87v97dhh2u.fsf@codeaurora.org>
 <YKYzwBJNTy4Czd1A@kroah.com>
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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.

Thanks,
Mani

> This seems odd...
> 
> greg k-h