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FAILED: patch "[PATCH] interconnect: qcom: rpm: fix registration race" failed to apply to 5.15-stable tree

PATCH [email protected] 1 participant 1 message Mar 20, 2023

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The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 90ae93d8affc1061cd87ca8ddd9a838c7d31a158
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '[email protected]' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

90ae93d8affc ("interconnect: qcom: rpm: fix registration race")
bc463201f608 ("interconnect: qcom: rpm: fix probe child-node error handling") 8ef2ca20754d ("interconnect: icc-rpm: Ignore return value of icc_provider_del() in .remove()") e39bf2972c6e ("interconnect: icc-rpm: Support child NoC device probe") 2b6c7d645118 ("interconnect: sdm660: merge common code into icc-rpm") 656ba110e164 ("interconnect: sdm660: drop default/unused values")
7ae77e60abef ("interconnect: sdm660: expand DEFINE_QNODE macros")
63e8ab610d8a ("interconnect: icc-rpm: move bus clocks handling into qnoc_probe")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 90ae93d8affc1061cd87ca8ddd9a838c7d31a158 Mon Sep 17 00:00:00 2001
From: Johan Hovold <[email protected]>
Date: Mon, 6 Mar 2023 08:56:36 +0100
Subject: [PATCH] interconnect: qcom: rpm: fix registration race

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 [email protected] # 5.7
Reviewed-by Konrad Dybcio <[email protected]>
Reviewed-by Jun Nie <[email protected]>
Signed-off-by Johan Hovold <[email protected]>
Link https://lore.kernel.org/r/[email protected] open here
Signed-off-by Georgi Djakov <[email protected]>
drivers/interconnect/qcom/icc-rpm.c +12 -12
index 91778cfcbc65..4180a06681b2 100644
@@ -503,7 +503,6 @@ 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;

@@ -511,12 +510,7 @@ 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);
-		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;

@@ -524,7 +518,7 @@ 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;

@@ -538,20 +532,26 @@ 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);
 	clk_bulk_disable_unprepare(qp->num_clks, qp->bus_clks);
-	icc_provider_del(provider);
 
 	return ret;
 }

@@ -561,9 +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;
 }