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

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Message-ID: <87pm3fws4m.fsf@kernel.org>
Date:   Tue, 22 Aug 2023 08:41:45 +0300
From:   Kalle Valo <kvalo@...nel.org>
To:     Ping-Ke Shih <pkshih@...ltek.com>
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

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.

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