linux-kernel - Re: [PATCH v3 1/3] wifi: rtw88: Move register access from rtw_bf

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Message-ID: <7e18f4f2-a05a-2738-426b-31482c58af35@leemhuis.info>
Date:   Tue, 20 Jun 2023 14:34:30 +0200
From:   "Linux regression tracking #update (Thorsten Leemhuis)" 
        <regressions@...mhuis.info>
To:     Sascha Hauer <s.hauer@...gutronix.de>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     linux-wireless@...r.kernel.org, tony0620emma@...il.com,
        kvalo@...nel.org, pkshih@...ltek.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Linux kernel regressions list <regressions@...ts.linux.dev>
Subject: Re: [PATCH v3 1/3] wifi: rtw88: Move register access from
 rtw_bf_assoc() outside the RCU

On 02.04.23 13:30, Linux regression tracking #adding (Thorsten Leemhuis)
wrote:
> On 31.03.23 14:59, Sascha Hauer wrote:
>> On Sun, Jan 08, 2023 at 10:13:22PM +0100, Martin Blumenstingl wrote:
>>> USB and (upcoming) SDIO support may sleep in the read/write handlers.
>>> Shrink the RCU critical section so it only cover the call to
>>> ieee80211_find_sta() and finding the ic_vht_cap/vht_cap based on the
>>> found station. This moves the chip's BFEE configuration outside the
>>> rcu_read_lock section and thus prevent "scheduling while atomic" or
>>> "Voluntary context switch within RCU read-side critical section!"
>>> warnings when accessing the registers using an SDIO card (which is
>>> where this issue has been spotted in the real world - but it also
>>> affects USB cards).
>>
>> Unfortunately this introduces a regression on my RTW8821CU chip. With
>> this it constantly looses connection to the AP and reconnects shortly
>> after:
> 
> #regzbot ^introduced c7eca79def44
> #regzbot title net: wifi: rtw88: RTW8821CU constantly looses connection
> to the AP and reconnects shortly after
> #regzbot ignore-activity

Forgot to resolve this in regzbot:

#regzbot resolve: turn's out this wasn't a regression, see
https://lore.kernel.org/lkml/20230403100043.GT19113@pengutronix.de/
#regzbot ignore-activity

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
That page also explains what to do if mails like this annoy you.