linux-kernel - Re: [PATCH 04/23] interconnect: imx: fix registration race

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Date:   Fri, 3 Feb 2023 17:01:21 +0100
From:   Luca Ceresoli <luca.ceresoli@...tlin.com>
To:     Johan Hovold <johan+linaro@...nel.org>
Cc:     Georgi Djakov <djakov@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Artur Świgoń <a.swigon@...sung.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Leonard Crestez <leonard.crestez@....com>,
        Alexandre Bailon <abailon@...libre.com>
Subject: Re: [PATCH 04/23] interconnect: imx: fix registration race

Hello Johan,

On Wed,  1 Feb 2023 11:15:40 +0100
Johan Hovold <johan+linaro@...nel.org> wrote:

> The current interconnect provider registration interface is inherently
> racy as nodes are not added until the after adding the provider. This
> can specifically cause racing DT lookups to fail.
> 
> Switch to using the new API where the provider is not registered until
> after it has been fully initialised.
> 
> Fixes: f0d8048525d7 ("interconnect: Add imx core driver")
> Cc: stable@...r.kernel.org      # 5.8
> Cc: Leonard Crestez <leonard.crestez@....com>
> Cc: Alexandre Bailon <abailon@...libre.com>
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>

Georgi pointed me to this series after I reported a bug yesterday [0],
that I found on iMX8MP. So I ran some tests with my original, failing
tree, minus one patch with my debugging code to hunt for the bug, plus
patches 1-4 of this series.

The original code was failing approx 5~10% of the times. With your 4
patches applied it ran 139 times with zero errors, which looks great! I
won't be able to do more testing until next Monday to be extra sure.

[0]
https://lore.kernel.org/linux-arm-kernel/20230202175525.3dba79a7@booty/T/#u

-- 
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com