From: Johan Hovold Date: Mon, 6 Mar 2023 07:56:38 +0000 (+0100) Subject: interconnect: qcom: rpmh: fix registration race X-Git-Tag: baikal/mips/sdk6.1~66 X-Git-Url: https://git.baikalelectronics.ru/sdk/?a=commitdiff_plain;h=51e831bce5322530951e81443bbd8bb57507dd7e;p=kernel.git interconnect: qcom: rpmh: fix registration race commit 9937f17535c62ab9eac4a55db0c48c671d7fde51 upstream. 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: b43753733b3f ("interconnect: qcom: Consolidate interconnect RPMh support") Cc: stable@vger.kernel.org # 5.7 Reviewed-by: Konrad Dybcio Signed-off-by: Johan Hovold Link: https://lore.kernel.org/r/20230306075651.2449-11-johan+linaro@kernel.org Signed-off-by: Georgi Djakov Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/interconnect/qcom/icc-rpmh.c b/drivers/interconnect/qcom/icc-rpmh.c index 5168bbf3d92fc..fdb5e58e408b4 100644 --- a/drivers/interconnect/qcom/icc-rpmh.c +++ b/drivers/interconnect/qcom/icc-rpmh.c @@ -192,9 +192,10 @@ int qcom_icc_rpmh_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 = dev; qp->bcms = desc->bcms; qp->num_bcms = desc->num_bcms; @@ -203,10 +204,6 @@ int qcom_icc_rpmh_probe(struct platform_device *pdev) if (IS_ERR(qp->voter)) return PTR_ERR(qp->voter); - ret = icc_provider_add(provider); - if (ret) - return ret; - for (i = 0; i < qp->num_bcms; i++) qcom_icc_bcm_init(qp->bcms[i], dev); @@ -218,7 +215,7 @@ int qcom_icc_rpmh_probe(struct platform_device *pdev) node = icc_node_create(qn->id); if (IS_ERR(node)) { ret = PTR_ERR(node); - goto err; + goto err_remove_nodes; } node->name = qn->name; @@ -232,19 +229,27 @@ int qcom_icc_rpmh_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); /* Populate child NoC devices if any */ if (of_get_child_count(dev->of_node) > 0) { ret = of_platform_populate(dev->of_node, NULL, NULL, dev); if (ret) - goto err; + goto err_deregister_provider; } return 0; -err: + +err_deregister_provider: + icc_provider_deregister(provider); +err_remove_nodes: icc_nodes_remove(provider); - icc_provider_del(provider); + return ret; } EXPORT_SYMBOL_GPL(qcom_icc_rpmh_probe); @@ -253,8 +258,8 @@ int qcom_icc_rpmh_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; }