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From:   Kalle Valo <kvalo@kernel.org>
To:     Johan Hovold <johan@kernel.org>
Cc:     Jeff Johnson <quic_jjohnson@quicinc.com>,
        Bjorn Andersson <quic_bjorande@quicinc.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Manikanta Pubbisetty <quic_mpubbise@quicinc.com>,
        ath11k@lists.infradead.org, linux-wireless@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Revert "Revert "wifi: ath11k: Enable threaded NAPI""
References: <20230809073432.4193-1-johan+linaro@kernel.org>
        <ZONpkVU1ORHj-zFH@hovoldconsulting.com>
Date:   Tue, 22 Aug 2023 15:56:24 +0300
In-Reply-To: <ZONpkVU1ORHj-zFH@hovoldconsulting.com> (Johan Hovold's message
        of "Mon, 21 Aug 2023 15:41:37 +0200")
Message-ID: <87o7izi6br.fsf@kernel.org>
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Johan Hovold <johan@kernel.org> writes:

> Hi Kalle,
>
> On Wed, Aug 09, 2023 at 09:34:32AM +0200, Johan Hovold wrote:
>
>> Disabling threaded NAPI caused a severe regression in 6.5-rc5 by making
>> the X13s completely unusable (e.g. no keyboard input, I've seen an RCU
>> splat once).
>> 
>> I'm supposed to be on holiday this week, but thanks to the rain I gave
>> rc5 a try and ran into this.
>> 
>> I've added Bjorn, Mani and Konrad on CC who may be able to help with
>> debugging this further if needed while I'm out-of-office.
>
> Back from my holiday now, and this regression is still there with
> 6.5-rc7.

I was also away but back now.

> Any chance we can get the offending commit reverted before 6.5 is
> released? 

The problem here is that would break QCN9074 again so there is no good
solution. I suspect we have a fundamental issue in ath11k which we just
haven't discovered yet. I would prefer to get to the bottom of this
before reverting anything.

> I'll take a closer look at this meanwhile.

Thanks, much appreciated. Did you try enabling all kernel debug
features, maybe they would give some hints?

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