On 1.02.2023 11:15, 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: 62feb14ee8a3 ("interconnect: qcom: Consolidate interconnect RPM support") Fixes: 30c8fa3ec61a ("interconnect: qcom: Add MSM8916 interconnect provider driver") Cc: stable@vger.kernel.org # 5.7 Cc: Jun Nie jun.nie@linaro.org Cc: Georgi Djakov georgi.djakov@linaro.org Signed-off-by: Johan Hovold johan+linaro@kernel.org

---

Reviewed-by: Konrad Dybcio konrad.dybcio@linaro.org

Konrad

drivers/interconnect/qcom/icc-rpm.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/interconnect/qcom/icc-rpm.c b/drivers/interconnect/qcom/icc-rpm.c index da595059cafd..4d0997b210f7 100644 --- a/drivers/interconnect/qcom/icc-rpm.c +++ b/drivers/interconnect/qcom/icc-rpm.c @@ -502,7 +502,6 @@ int qnoc_probe(struct platform_device *pdev) } provider = &qp->provider;

• INIT_LIST_HEAD(&provider->nodes); provider->dev = dev; provider->set = qcom_icc_set; provider->pre_aggregate = qcom_icc_pre_bw_aggregate;

@@ -510,11 +509,7 @@ int qnoc_probe(struct platform_device *pdev) 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);
  

• goto err_disable_clks;
  

• }

• icc_provider_init(provider);

for (i = 0; i < num_nodes; i++) { size_t j; @@ -522,7 +517,7 @@ 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; @@ -536,19 +531,25 @@ 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);

/* 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);

err_disable_clks: clk_bulk_disable_unprepare(qp->num_clks, qp->bus_clks); @@ -560,9 +561,9 @@ 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); clk_bulk_disable_unprepare(qp->num_clks, qp->bus_clks);

• icc_provider_del(&qp->provider);

return 0; }