netdev - Re: [PATCH] wifi: rtl8xxxu: fix authentication timeout due to incorrect RCR value

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Message-ID: <3854af21-822d-75f4-0e74-e1998143d59f@gmail.com>
Date:   Thu, 27 Apr 2023 20:01:06 +0300
From:   Bitterblue Smith <rtl8821cerfe2@...il.com>
To:     Yun Lu <luyun_611@....com>, Jes.Sorensen@...il.com
Cc:     kvalo@...nel.org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH] wifi: rtl8xxxu: fix authentication timeout due to
 incorrect RCR value

On 27/04/2023 05:05, Yun Lu wrote:
> From: Yun Lu <luyun@...inos.cn>
> 
> When using rtl8192cu with rtl8xxxu driver to connect wifi, there is a
> probability of failure, which shows "authentication with ... timed out".
> Through debugging, it was found that the RCR register has been inexplicably
> modified to an incorrect value, resulting in the nic not being able to
> receive authenticated frames.
> 
> To fix this problem, add regrcr in rtl8xxxu_priv struct, and store
> the RCR value every time the register is writen, and use it the next
> time the register need to be modified.
> 

Can this bug be reproduced easily? Is it always the same bits which
are mysteriously cleared from REG_RCR?