linux-kernel - Re: [PATCH AUTOSEL 5.15 17/23] fec: Restart PPS after link state change

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Message-ID: <YyIWsCBYKYyKR5SA@sashalap>
Date:   Wed, 14 Sep 2022 14:00:16 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Csókás Bence <csokas.bence@...lan.hu>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.15 17/23] fec: Restart PPS after link state
 change

On Wed, Aug 31, 2022 at 03:03:40PM +0200, Csókás Bence wrote:
>
>On 2022. 08. 30. 19:21, Sasha Levin wrote:
>>From: Csókás Bence <csokas.bence@...lan.hu>
>>
>>[ Upstream commit f79959220fa5fbda939592bf91c7a9ea90419040 ]
>>
>>On link state change, the controller gets reset,
>>causing PPS to drop out and the PHC to lose its
>>time and calibration. So we restart it if needed,
>>restoring calibration and time registers.
>
>There is an ongoing investigation on netdev@ about a potential kernel 
>panic on kernels newer than 5.12 with this patch applied. Please hold 
>off on backporting to 5.15 until the bugfix is applied to upstream.

Will do, thanks!

-- 
Thanks,
Sasha