linux-kernel - [PATCH 2/2] isdn: capi: make capi

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Message-Id: <20240305-class_cleanup-isdn-v1-2-6f0edca75b61@marliere.net>
Date: Tue, 05 Mar 2024 17:04:48 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: Karsten Keil <isdn@...ux-pingi.de>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH 2/2] isdn: capi: make capi_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 capi_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/isdn/capi/capi.c | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/drivers/isdn/capi/capi.c b/drivers/isdn/capi/capi.c
index 6e80d7bd3c4d..3ed257334562 100644
--- a/drivers/isdn/capi/capi.c
+++ b/drivers/isdn/capi/capi.c
@@ -49,7 +49,9 @@ MODULE_LICENSE("GPL");
 /* -------- driver information -------------------------------------- */
 
 static DEFINE_MUTEX(capi_mutex);
-static struct class *capi_class;
+static const struct class capi_class = {
+	.name = "capi",
+};
 static int capi_major = 68;		/* allocated */
 
 module_param_named(major, capi_major, uint, 0);
@@ -1393,18 +1395,19 @@ static int __init capi_init(void)
 		kcapi_exit();
 		return major_ret;
 	}
-	capi_class = class_create("capi");
-	if (IS_ERR(capi_class)) {
+
+	ret = class_register(&capi_class);
+	if (ret) {
 		unregister_chrdev(capi_major, "capi20");
 		kcapi_exit();
-		return PTR_ERR(capi_class);
+		return ret;
 	}
 
-	device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi20");
+	device_create(&capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi20");
 
 	if (capinc_tty_init() < 0) {
-		device_destroy(capi_class, MKDEV(capi_major, 0));
-		class_destroy(capi_class);
+		device_destroy(&capi_class, MKDEV(capi_major, 0));
+		class_unregister(&capi_class);
 		unregister_chrdev(capi_major, "capi20");
 		kcapi_exit();
 		return -ENOMEM;
@@ -1427,8 +1430,8 @@ static void __exit capi_exit(void)
 {
 	proc_exit();
 
-	device_destroy(capi_class, MKDEV(capi_major, 0));
-	class_destroy(capi_class);
+	device_destroy(&capi_class, MKDEV(capi_major, 0));
+	class_unregister(&capi_class);
 	unregister_chrdev(capi_major, "capi20");
 
 	capinc_tty_exit();

-- 
2.43.0