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GET /api/patches/2225642/?format=api
{ "id": 2225642, "url": "http://patchwork.ozlabs.org/api/patches/2225642/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260421104102.12322-1-manivannan.sadhasivam@oss.qualcomm.com/", "project": { "id": 28, "url": "http://patchwork.ozlabs.org/api/projects/28/?format=api", "name": "Linux PCI development", "link_name": "linux-pci", "list_id": "linux-pci.vger.kernel.org", "list_email": "linux-pci@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260421104102.12322-1-manivannan.sadhasivam@oss.qualcomm.com>", "list_archive_url": null, "date": "2026-04-21T10:41:01", "name": "PCI/pwrctrl: Do not try to power on/off devices that don't need pwrctrl", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "89e2a4efed238f8a3b7b0226e943b4b4bc38981f", "submitter": { "id": 91273, "url": "http://patchwork.ozlabs.org/api/people/91273/?format=api", "name": "Manivannan Sadhasivam", "email": "manivannan.sadhasivam@oss.qualcomm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260421104102.12322-1-manivannan.sadhasivam@oss.qualcomm.com/mbox/", "series": [ { "id": 500777, "url": "http://patchwork.ozlabs.org/api/series/500777/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/list/?series=500777", "date": "2026-04-21T10:41:01", "name": "PCI/pwrctrl: Do not try to power on/off devices that don't need pwrctrl", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500777/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2225642/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2225642/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-pci+bounces-52832-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-pci@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256\n header.s=qcppdkim1 header.b=jHMQysYi;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com\n header.a=rsa-sha256 header.s=google header.b=RFjjlVLp;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.234.253.10; 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It is currently used in\npci_pwrctrl_create_device(), but not in pci_pwrctrl_power_{on/off}_device()\nAPIs. This leads to pwrctrl core trying to power on/off the incompatible\ndevices like USB hub downstream ports defined in DT.\n\nHence, add this check to prevent pwrctrl core from poking at wrong\ndevices. For this purpose, move the pci_pwrctrl_is_required() helper\ndefinition to the top.\n\nFixes: b35cf3b6aa1e (\"PCI/pwrctrl: Add APIs to power on/off pwrctrl devices\")\nReported-by: Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>\nSigned-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>\n---\n drivers/pci/pwrctrl/core.c | 90 ++++++++++++++++++++------------------\n 1 file changed, 48 insertions(+), 42 deletions(-)", "diff": "diff --git a/drivers/pci/pwrctrl/core.c b/drivers/pci/pwrctrl/core.c\nindex 97cff5b8ca88..b5a0a14d316e 100644\n--- a/drivers/pci/pwrctrl/core.c\n+++ b/drivers/pci/pwrctrl/core.c\n@@ -139,6 +139,48 @@ int devm_pci_pwrctrl_device_set_ready(struct device *dev,\n }\n EXPORT_SYMBOL_GPL(devm_pci_pwrctrl_device_set_ready);\n \n+/*\n+ * Check whether the pwrctrl device really needs to be created or not. The\n+ * pwrctrl device will only be created if the node satisfies below requirements:\n+ *\n+ * 1. Presence of compatible property with \"pci\" prefix to match against the\n+ * pwrctrl driver (AND)\n+ * 2. At least one of the power supplies defined in the devicetree node of the\n+ * device (OR) in the remote endpoint parent node to indicate pwrctrl\n+ * requirement.\n+ */\n+static bool pci_pwrctrl_is_required(struct device_node *np)\n+{\n+\tstruct device_node *endpoint;\n+\tconst char *compat;\n+\tint ret;\n+\n+\tret = of_property_read_string(np, \"compatible\", &compat);\n+\tif (ret < 0)\n+\t\treturn false;\n+\n+\tif (!strstarts(compat, \"pci\"))\n+\t\treturn false;\n+\n+\tif (of_pci_supply_present(np))\n+\t\treturn true;\n+\n+\tif (of_graph_is_present(np)) {\n+\t\tfor_each_endpoint_of_node(np, endpoint) {\n+\t\t\tstruct device_node *remote __free(device_node) =\n+\t\t\t\tof_graph_get_remote_port_parent(endpoint);\n+\t\t\tif (remote) {\n+\t\t\t\tif (of_pci_supply_present(remote)) {\n+\t\t\t\t\tof_node_put(endpoint);\n+\t\t\t\t\treturn true;\n+\t\t\t\t}\n+\t\t\t}\n+\t\t}\n+\t}\n+\n+\treturn false;\n+}\n+\n static int __pci_pwrctrl_power_off_device(struct device *dev)\n {\n \tstruct pci_pwrctrl *pwrctrl = dev_get_drvdata(dev);\n@@ -157,6 +199,9 @@ static void pci_pwrctrl_power_off_device(struct device_node *np)\n \tfor_each_available_child_of_node_scoped(np, child)\n \t\tpci_pwrctrl_power_off_device(child);\n \n+\tif (!pci_pwrctrl_is_required(np))\n+\t\treturn;\n+\n \tpdev = of_find_device_by_node(np);\n \tif (!pdev)\n \t\treturn;\n@@ -213,6 +258,9 @@ static int pci_pwrctrl_power_on_device(struct device_node *np)\n \t\t\treturn ret;\n \t}\n \n+\tif (!pci_pwrctrl_is_required(np))\n+\t\treturn 0;\n+\n \tpdev = of_find_device_by_node(np);\n \tif (!pdev)\n \t\treturn 0;\n@@ -268,48 +316,6 @@ int pci_pwrctrl_power_on_devices(struct device *parent)\n }\n EXPORT_SYMBOL_GPL(pci_pwrctrl_power_on_devices);\n \n-/*\n- * Check whether the pwrctrl device really needs to be created or not. The\n- * pwrctrl device will only be created if the node satisfies below requirements:\n- *\n- * 1. Presence of compatible property with \"pci\" prefix to match against the\n- * pwrctrl driver (AND)\n- * 2. At least one of the power supplies defined in the devicetree node of the\n- * device (OR) in the remote endpoint parent node to indicate pwrctrl\n- * requirement.\n- */\n-static bool pci_pwrctrl_is_required(struct device_node *np)\n-{\n-\tstruct device_node *endpoint;\n-\tconst char *compat;\n-\tint ret;\n-\n-\tret = of_property_read_string(np, \"compatible\", &compat);\n-\tif (ret < 0)\n-\t\treturn false;\n-\n-\tif (!strstarts(compat, \"pci\"))\n-\t\treturn false;\n-\n-\tif (of_pci_supply_present(np))\n-\t\treturn true;\n-\n-\tif (of_graph_is_present(np)) {\n-\t\tfor_each_endpoint_of_node(np, endpoint) {\n-\t\t\tstruct device_node *remote __free(device_node) =\n-\t\t\t\tof_graph_get_remote_port_parent(endpoint);\n-\t\t\tif (remote) {\n-\t\t\t\tif (of_pci_supply_present(remote)) {\n-\t\t\t\t\tof_node_put(endpoint);\n-\t\t\t\t\treturn true;\n-\t\t\t\t}\n-\t\t\t}\n-\t\t}\n-\t}\n-\n-\treturn false;\n-}\n-\n static int pci_pwrctrl_create_device(struct device_node *np,\n \t\t\t\t struct device *parent)\n {\n", "prefixes": [] }