linux-kernel - [PATCH] PCI: endpoint: make pci_epc

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Message-ID: <2024061011-citable-herbicide-1095@gregkh>
Date: Mon, 10 Jun 2024 10:20:12 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-pci@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH] PCI: endpoint: make pci_epc_class constant

Now that the driver core allows for struct class to be in read-only
memory, we should make all 'class' structures declared at build time
placing them into read-only memory, instead of having to be dynamically
allocated at runtime.

Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc: "Krzysztof Wilczyński" <kw@...ux.com>
Cc: Manivannan Sadhasivam <mani@...nel.org>
Cc: Kishon Vijay Abraham I <kishon@...nel.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: linux-pci@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/pci/endpoint/pci-epc-core.c | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index 47d27ec7439d..ed038dd77f83 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -14,7 +14,9 @@
 #include <linux/pci-epf.h>
 #include <linux/pci-ep-cfs.h>
 
-static struct class *pci_epc_class;
+static const struct class pci_epc_class = {
+	.name = "pci_epc",
+};
 
 static void devm_pci_epc_release(struct device *dev, void *res)
 {
@@ -60,7 +62,7 @@ struct pci_epc *pci_epc_get(const char *epc_name)
 	struct device *dev;
 	struct class_dev_iter iter;
 
-	class_dev_iter_init(&iter, pci_epc_class, NULL, NULL);
+	class_dev_iter_init(&iter, &pci_epc_class, NULL, NULL);
 	while ((dev = class_dev_iter_next(&iter))) {
 		if (strcmp(epc_name, dev_name(dev)))
 			continue;
@@ -867,7 +869,7 @@ __pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
 	INIT_LIST_HEAD(&epc->pci_epf);
 
 	device_initialize(&epc->dev);
-	epc->dev.class = pci_epc_class;
+	epc->dev.class = &pci_epc_class;
 	epc->dev.parent = dev;
 	epc->dev.release = pci_epc_release;
 	epc->ops = ops;
@@ -927,20 +929,13 @@ EXPORT_SYMBOL_GPL(__devm_pci_epc_create);
 
 static int __init pci_epc_init(void)
 {
-	pci_epc_class = class_create("pci_epc");
-	if (IS_ERR(pci_epc_class)) {
-		pr_err("failed to create pci epc class --> %ld\n",
-		       PTR_ERR(pci_epc_class));
-		return PTR_ERR(pci_epc_class);
-	}
-
-	return 0;
+	return class_register(&pci_epc_class);
 }
 module_init(pci_epc_init);
 
 static void __exit pci_epc_exit(void)
 {
-	class_destroy(pci_epc_class);
+	class_unregister(&pci_epc_class);
 }
 module_exit(pci_epc_exit);
 
-- 
2.45.2