linux-kernel - [PATCH] net: phy: core: make phy

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Message-Id: <20240305-class_cleanup-phy-v1-1-106013a644dc@marliere.net>
Date: Tue, 05 Mar 2024 15:18:51 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: Vinod Koul <vkoul@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>
Cc: linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH] net: phy: core: make phy_class constant

Since commit 43a7206b0963 ("driver core: class: make class_register() take
a const *"), the driver core allows for struct class to be in read-only
memory, so move the phy_class structure to be declared at build time
placing it into read-only memory, instead of having to be dynamically
allocated at boot time.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@...liere.net>
---
 drivers/phy/phy-core.c | 26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index 7f9b4de772ee..5776d44fd32f 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -20,7 +20,12 @@
 #include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
 
-static struct class *phy_class;
+static void phy_release(struct device *dev);
+static const struct class phy_class = {
+	.name = "phy",
+	.dev_release = phy_release,
+};
+
 static struct dentry *phy_debugfs_root;
 static DEFINE_MUTEX(phy_provider_mutex);
 static LIST_HEAD(phy_provider_list);
@@ -706,7 +711,7 @@ struct phy *of_phy_simple_xlate(struct device *dev,
 	struct phy *phy;
 	struct class_dev_iter iter;
 
-	class_dev_iter_init(&iter, phy_class, NULL, NULL);
+	class_dev_iter_init(&iter, &phy_class, NULL, NULL);
 	while ((dev = class_dev_iter_next(&iter))) {
 		phy = to_phy(dev);
 		if (args->np != phy->dev.of_node)
@@ -969,7 +974,7 @@ struct phy *phy_create(struct device *dev, struct device_node *node,
 	device_initialize(&phy->dev);
 	mutex_init(&phy->mutex);
 
-	phy->dev.class = phy_class;
+	phy->dev.class = &phy_class;
 	phy->dev.parent = dev;
 	phy->dev.of_node = node ?: dev->of_node;
 	phy->id = id;
@@ -1238,14 +1243,13 @@ static void phy_release(struct device *dev)
 
 static int __init phy_core_init(void)
 {
-	phy_class = class_create("phy");
-	if (IS_ERR(phy_class)) {
-		pr_err("failed to create phy class --> %ld\n",
-			PTR_ERR(phy_class));
-		return PTR_ERR(phy_class);
-	}
+	int err;
 
-	phy_class->dev_release = phy_release;
+	err = class_register(&phy_class);
+	if (err) {
+		pr_err("failed to register phy class");
+		return err;
+	}
 
 	phy_debugfs_root = debugfs_create_dir("phy", NULL);
 
@@ -1256,6 +1260,6 @@ device_initcall(phy_core_init);
 static void __exit phy_core_exit(void)
 {
 	debugfs_remove_recursive(phy_debugfs_root);
-	class_destroy(phy_class);
+	class_unregister(&phy_class);
 }
 module_exit(phy_core_exit);

---
base-commit: 00ca8a15dafa990d391abc37f2b8256ddf909b35
change-id: 20240305-class_cleanup-phy-668a148b2acd

Best regards,
-- 
Ricardo B. Marliere <ricardo@...liere.net>