From: Abel Vesa <abel.vesa@linaro.org>
To: Johan Hovold <johan+linaro@kernel.org>
Cc: "Georgi Djakov" <djakov@kernel.org>,
"Shawn Guo" <shawnguo@kernel.org>,
"Sascha Hauer" <s.hauer@pengutronix.de>,
"Pengutronix Kernel Team" <kernel@pengutronix.de>,
"Fabio Estevam" <festevam@gmail.com>,
"NXP Linux Team" <linux-imx@nxp.com>,
"Andy Gross" <agross@kernel.org>,
"Bjorn Andersson" <andersson@kernel.org>,
"Konrad Dybcio" <konrad.dybcio@linaro.org>,
"Sylwester Nawrocki" <s.nawrocki@samsung.com>,
"Artur Świgoń" <a.swigon@samsung.com>,
"Krzysztof Kozlowski" <krzysztof.kozlowski@linaro.org>,
"Alim Akhtar" <alim.akhtar@samsung.com>,
"Thierry Reding" <thierry.reding@gmail.com>,
"Jonathan Hunter" <jonathanh@nvidia.com>,
linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-arm-msm@vger.kernel.org, linux-samsung-soc@vger.kernel.org,
linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 13/23] interconnect: qcom: sm8550: fix registration race
Date: Mon, 6 Mar 2023 11:03:14 +0200 [thread overview]
Message-ID: <ZAWsUrlrOfmmNBy3@linaro.org> (raw)
In-Reply-To: <20230306075651.2449-14-johan+linaro@kernel.org>
On 23-03-06 08:56:41, Johan Hovold 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: e6f0d6a30f73 ("interconnect: qcom: Add SM8550 interconnect provider driver")
> Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
> Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
> Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> ---
Any changes since v1 or is it just a resend?
> drivers/interconnect/qcom/sm8550.c | 22 +++++++++++-----------
> 1 file changed, 11 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/interconnect/qcom/sm8550.c b/drivers/interconnect/qcom/sm8550.c
> index 54fa027ab961..7ab492ca8fe0 100644
> --- a/drivers/interconnect/qcom/sm8550.c
> +++ b/drivers/interconnect/qcom/sm8550.c
> @@ -2197,9 +2197,10 @@ static int qnoc_probe(struct platform_device *pdev)
> provider->pre_aggregate = qcom_icc_pre_aggregate;
> provider->aggregate = qcom_icc_aggregate;
> provider->xlate_extended = qcom_icc_xlate_extended;
> - INIT_LIST_HEAD(&provider->nodes);
> provider->data = data;
>
> + icc_provider_init(provider);
> +
> qp->dev = &pdev->dev;
> qp->bcms = desc->bcms;
> qp->num_bcms = desc->num_bcms;
> @@ -2208,12 +2209,6 @@ static int qnoc_probe(struct platform_device *pdev)
> if (IS_ERR(qp->voter))
> return PTR_ERR(qp->voter);
>
> - ret = icc_provider_add(provider);
> - if (ret) {
> - dev_err_probe(&pdev->dev, ret,
> - "error adding interconnect provider\n");
> - return ret;
> - }
>
> for (i = 0; i < qp->num_bcms; i++)
> qcom_icc_bcm_init(qp->bcms[i], &pdev->dev);
> @@ -2227,7 +2222,7 @@ static int qnoc_probe(struct platform_device *pdev)
> node = icc_node_create(qnodes[i]->id);
> if (IS_ERR(node)) {
> ret = PTR_ERR(node);
> - goto err;
> + goto err_remove_nodes;
> }
>
> node->name = qnodes[i]->name;
> @@ -2241,12 +2236,17 @@ static int qnoc_probe(struct platform_device *pdev)
> }
> data->num_nodes = num_nodes;
>
> + ret = icc_provider_register(provider);
> + if (ret)
> + goto err_remove_nodes;
> +
> platform_set_drvdata(pdev, qp);
>
> return 0;
> -err:
> +
> +err_remove_nodes:
> icc_nodes_remove(provider);
> - icc_provider_del(provider);
> +
> return ret;
> }
>
> @@ -2254,8 +2254,8 @@ static int qnoc_remove(struct platform_device *pdev)
> {
> struct qcom_icc_provider *qp = platform_get_drvdata(pdev);
>
> + icc_provider_deregister(&qp->provider);
> icc_nodes_remove(&qp->provider);
> - icc_provider_del(&qp->provider);
>
> return 0;
> }
> --
> 2.39.2
>
next prev parent reply other threads:[~2023-03-06 9:03 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-06 7:56 [PATCH v2 00/23] interconnect: fix racy provider registration Johan Hovold
2023-03-06 7:56 ` [PATCH v2 01/23] interconnect: fix mem leak when freeing nodes Johan Hovold
2023-03-07 9:42 ` Luca Ceresoli
2023-03-06 7:56 ` [PATCH v2 02/23] interconnect: fix icc_provider_del() error handling Johan Hovold
2023-03-07 9:43 ` Luca Ceresoli
2023-03-06 7:56 ` [PATCH v2 03/23] interconnect: fix provider registration API Johan Hovold
2023-03-07 9:43 ` Luca Ceresoli
2023-03-06 7:56 ` [PATCH v2 04/23] interconnect: imx: fix registration race Johan Hovold
2023-03-07 9:43 ` Luca Ceresoli
2023-03-07 10:25 ` Johan Hovold
2023-03-06 7:56 ` [PATCH v2 05/23] interconnect: qcom: osm-l3: " Johan Hovold
2023-03-06 7:56 ` [PATCH v2 06/23] interconnect: qcom: rpm: fix probe child-node error handling Johan Hovold
2023-03-06 7:56 ` [PATCH v2 07/23] interconnect: qcom: rpm: fix probe PM domain " Johan Hovold
2023-03-06 7:56 ` [PATCH v2 08/23] interconnect: qcom: rpm: fix registration race Johan Hovold
2023-03-06 7:56 ` [PATCH v2 09/23] interconnect: qcom: rpmh: fix probe child-node error handling Johan Hovold
2023-03-06 7:56 ` [PATCH v2 10/23] interconnect: qcom: rpmh: fix registration race Johan Hovold
2023-03-06 7:56 ` [PATCH v2 11/23] interconnect: qcom: msm8974: " Johan Hovold
2023-03-06 7:56 ` [PATCH v2 12/23] interconnect: qcom: sm8450: " Johan Hovold
2023-03-06 7:56 ` [PATCH v2 13/23] interconnect: qcom: sm8550: " Johan Hovold
2023-03-06 9:03 ` Abel Vesa [this message]
2023-03-06 9:34 ` Johan Hovold
2023-03-06 9:39 ` Abel Vesa
2023-03-06 10:04 ` Johan Hovold
2023-03-06 7:56 ` [PATCH v2 14/23] interconnect: exynos: fix node leak in probe PM QoS error path Johan Hovold
2023-03-06 7:56 ` [PATCH v2 15/23] interconnect: exynos: fix registration race Johan Hovold
2023-03-06 7:56 ` [PATCH v2 16/23] interconnect: exynos: drop redundant link destroy Johan Hovold
2023-03-06 7:56 ` [PATCH v2 17/23] memory: tegra: fix interconnect registration race Johan Hovold
2023-03-06 7:56 ` [PATCH v2 18/23] memory: tegra124-emc: " Johan Hovold
2023-03-06 7:56 ` [PATCH v2 19/23] memory: tegra20-emc: " Johan Hovold
2023-03-06 7:56 ` [PATCH v2 20/23] memory: tegra30-emc: " Johan Hovold
2023-03-06 7:56 ` [PATCH v2 21/23] interconnect: drop racy registration API Johan Hovold
2023-03-06 7:56 ` [PATCH v2 22/23] interconnect: drop unused icc_get() interface Johan Hovold
2023-03-06 7:56 ` [PATCH v2 23/23] interconnect: drop unused icc_link_destroy() interface Johan Hovold
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