PCI: endpoint: Make pci_epc_class struct 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.

Link: https://lore.kernel.org/linux-pci/2024061011-citable-herbicide-1095@gregkh
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>

diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index 47a91dc..84309df 100644 (file)
--- 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;
@@ -893,7 +895,7 @@ __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;
@@ -953,20 +955,13 @@ 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);