linux-kernel - RE: PROBLEM: kernel warns about voluntary context switch within RCU critical section in rtw88

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Message-ID: <cf3ca98d6c18482eb63e3713f67e44e6@realtek.com>
Date:   Tue, 22 Aug 2023 05:46:53 +0000
From:   Ping-Ke Shih <pkshih@...ltek.com>
To:     Kalle Valo <kvalo@...nel.org>
CC:     Sergey Korolev <korolev.sergey@...il.com>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: PROBLEM: kernel warns about voluntary context switch within RCU critical section in rtw88_usb



> -----Original Message-----
> From: Kalle Valo <kvalo@...nel.org>
> Sent: Tuesday, August 22, 2023 1:42 PM
> To: Ping-Ke Shih <pkshih@...ltek.com>
> Cc: Sergey Korolev <korolev.sergey@...il.com>; linux-wireless@...r.kernel.org;
> linux-kernel@...r.kernel.org
> Subject: Re: PROBLEM: kernel warns about voluntary context switch within RCU critical section in rtw88_usb
> 
> Ping-Ke Shih <pkshih@...ltek.com> writes:
> 
> > From: Sergey Korolev <korolev.sergey@...il.com>
> > Sent: Monday, August 21, 2023 10:28 PM
> > To: Ping-Ke Shih <pkshih@...ltek.com>; Kalle Valo <kvalo@...nel.org>; linux-wireless@...r.kernel.org;
> linux-kernel@...r.kernel.org
> > Subject: PROBLEM: kernel warns about voluntary context switch within RCU critical section in rtw88_usb
> >>
> >> Please note I use an unmodified driver from the upstream 28c11c29494f1b34e39641eead9c60a8bd26170d
> >> ("wifi: rtw88: fix not entering PS mode after AP stops") build for 6.2 kernel (Ubuntu 23.04).
> >
> > I feel Martin has been addressed this problem during development of SDIO and USB
> > by 8a1e2fd8e2da ("wifi: rtw88: Move register access from rtw_bf_assoc() outside the RCU")
> > Please take a look if this patch is existing in your source.
> 
> Commit 8a1e2fd8e2da was merged to v6.3-rc1 so v6.2 won't have it.
> 

Sergey said he uses driver from 28c11c29494f that is v6.4-rc5 or v6.5, so
seemingly it should include Martin's patch. Not sure what is wrong.

Ping-Ke