linux-kernel - Re: [PATCH] Revert "Revert "wifi: ath11k: Enable threaded NAPI""

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Date:   Wed, 9 Aug 2023 14:32:37 +0530
From:   Manikanta Pubbisetty <quic_mpubbise@...cinc.com>
To:     Johan Hovold <johan+linaro@...nel.org>,
        Kalle Valo <kvalo@...nel.org>
CC:     Jeff Johnson <quic_jjohnson@...cinc.com>,
        Bjorn Andersson <quic_bjorande@...cinc.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        <ath11k@...ts.infradead.org>, <linux-wireless@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Revert "Revert "wifi: ath11k: Enable threaded NAPI""

On 8/9/2023 1:04 PM, Johan Hovold wrote:
> This reverts commit d265ebe41c911314bd273c218a37088835959fa1.
> 
> Disabling threaded NAPI causes the Lenovo ThinkPad X13s to hang (e.g. no
> more interrupts received) almost immediately during RX.
> 
> Apparently something broke since commit 13aa2fb692d3 ("wifi: ath11k:
> Enable threaded NAPI") so that a simple revert is no longer possible.
> 

This is getting as weird as it would get :)

> As commit d265ebe41c91 ("Revert "wifi: ath11k: Enable threaded NAPI"")
> does not address the underlying issue reported with QCN9074, it seems we
> need to reenable threaded NAPI before fixing both bugs properly.
> 

It seems that the revert has actually solved the issue reported with 
QCN9074.

https://bugzilla.kernel.org/show_bug.cgi?id=217536

We were trying to reproduce the problem on X86+QCN9074 (with threaded 
NAPI) from quite some time, but there is no repro yet.

Actually, enabling/disabling threaded NAPI is a simple affair; I'm 
wondering to hear that interrupts are blocked due  to not having 
threaded NAPI.

What is the chip that Lenovo Thinkpad X13s is having?

Thanks,
Manikanta