From: Johan Hovold johan+linaro@kernel.org
commit 90ae93d8affc1061cd87ca8ddd9a838c7d31a158 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: 62feb14ee8a3 ("interconnect: qcom: Consolidate interconnect RPM support") Fixes: 30c8fa3ec61a ("interconnect: qcom: Add MSM8916 interconnect provider driver") Cc: stable@vger.kernel.org # 5.7 Reviewed-by: Konrad Dybcio konrad.dybcio@linaro.org Reviewed-by: Jun Nie jun.nie@linaro.org Signed-off-by: Johan Hovold johan+linaro@kernel.org Link: https://lore.kernel.org/r/20230306075651.2449-9-johan+linaro@kernel.org Signed-off-by: Georgi Djakov djakov@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/interconnect/qcom/icc-rpm.c | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-)
--- a/drivers/interconnect/qcom/icc-rpm.c +++ b/drivers/interconnect/qcom/icc-rpm.c @@ -506,7 +506,6 @@ regmap_done: }
provider = &qp->provider; - INIT_LIST_HEAD(&provider->nodes); provider->dev = dev; provider->set = qcom_icc_set; provider->pre_aggregate = qcom_icc_pre_bw_aggregate; @@ -514,12 +513,7 @@ regmap_done: provider->xlate_extended = qcom_icc_xlate_extended; provider->data = data;
- ret = icc_provider_add(provider); - if (ret) { - dev_err(dev, "error adding interconnect provider: %d\n", ret); - clk_bulk_disable_unprepare(qp->num_clks, qp->bus_clks); - return ret; - } + icc_provider_init(provider);
for (i = 0; i < num_nodes; i++) { size_t j; @@ -527,7 +521,7 @@ regmap_done: 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; @@ -541,20 +535,26 @@ regmap_done: } 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); clk_bulk_disable_unprepare(qp->num_clks, qp->bus_clks); - icc_provider_del(provider);
return ret; } @@ -564,9 +564,9 @@ int qnoc_remove(struct platform_device * { struct qcom_icc_provider *qp = platform_get_drvdata(pdev);
+ icc_provider_deregister(&qp->provider); icc_nodes_remove(&qp->provider); clk_bulk_disable_unprepare(qp->num_clks, qp->bus_clks); - icc_provider_del(&qp->provider);
return 0; }