linux-kernel - Re: [PATCH v2 03/23] interconnect: fix provider registration API

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Message-ID: <20230307104315.14ff7e4d@booty>
Date:   Tue, 7 Mar 2023 10:43:15 +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
Subject: Re: [PATCH v2 03/23] interconnect: fix provider registration API

On Mon,  6 Mar 2023 08:56:31 +0100
Johan Hovold <johan+linaro@...nel.org> wrote:

> The current interconnect provider interface is inherently racy as
> providers are expected to be added before being fully initialised.
> 
> Specifically, nodes are currently not added and the provider data is not
> initialised until after registering the provider which can cause racing
> DT lookups to fail.
> 
> Add a new provider API which will be used to fix up the interconnect
> drivers.
> 
> The old API is reimplemented using the new interface and will be removed
> once all drivers have been fixed.
> 
> Fixes: 11f1ceca7031 ("interconnect: Add generic on-chip interconnect API")
> Fixes: 87e3031b6fbd ("interconnect: Allow endpoints translation via DT")
> Cc: stable@...r.kernel.org      # 5.1
> Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>

[Tested on i.MX8MP using an MSC SM2-MB-EP1 Board]
Tested-by: Luca Ceresoli <luca.ceresoli@...tlin.com>

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