From: Ricardo B. Marliere <ricardo@marliere.net>
Date: Tue, 5 Mar 2024 13:26:26 +0000 (-0300)
Subject: media: lirc_dev: Make lirc_class constant
X-Git-Tag: v6.10-rc1~135^2~310
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=8d93d0674bb1b3770d96e585248f0d5856bf0f64;p=thirdparty%2Fkernel%2Flinux.git

media: lirc_dev: Make lirc_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 lirc_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@linuxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@marliere.net>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
---

diff --git a/drivers/media/rc/lirc_dev.c b/drivers/media/rc/lirc_dev.c
index caad59f76793f..52aea41677183 100644
--- a/drivers/media/rc/lirc_dev.c
+++ b/drivers/media/rc/lirc_dev.c
@@ -27,7 +27,9 @@ static dev_t lirc_base_dev;
 static DEFINE_IDA(lirc_ida);
 
 /* Only used for sysfs but defined to void otherwise */
-static struct class *lirc_class;
+static const struct class lirc_class = {
+	.name = "lirc",
+};
 
 /**
  * lirc_raw_event() - Send raw IR data to lirc to be relayed to userspace
@@ -724,7 +726,7 @@ int lirc_register(struct rc_dev *dev)
 		return minor;
 
 	device_initialize(&dev->lirc_dev);
-	dev->lirc_dev.class = lirc_class;
+	dev->lirc_dev.class = &lirc_class;
 	dev->lirc_dev.parent = &dev->dev;
 	dev->lirc_dev.release = lirc_release_device;
 	dev->lirc_dev.devt = MKDEV(MAJOR(lirc_base_dev), minor);
@@ -789,15 +791,13 @@ int __init lirc_dev_init(void)
 {
 	int retval;
 
-	lirc_class = class_create("lirc");
-	if (IS_ERR(lirc_class)) {
-		pr_err("class_create failed\n");
-		return PTR_ERR(lirc_class);
-	}
+	retval = class_register(&lirc_class);
+	if (retval)
+		return retval;
 
 	retval = alloc_chrdev_region(&lirc_base_dev, 0, RC_DEV_MAX, "lirc");
 	if (retval) {
-		class_destroy(lirc_class);
+		class_unregister(&lirc_class);
 		pr_err("alloc_chrdev_region failed\n");
 		return retval;
 	}
@@ -810,7 +810,7 @@ int __init lirc_dev_init(void)
 
 void __exit lirc_dev_exit(void)
 {
-	class_destroy(lirc_class);
+	class_unregister(&lirc_class);
 	unregister_chrdev_region(lirc_base_dev, RC_DEV_MAX);
 }