linux-kernel - [PATCH 2/2] HID: hidraw: make hidraw

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Message-ID: <20230620183141.681353-4-gregkh@linuxfoundation.org>
Date:   Tue, 20 Jun 2023 20:31:43 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-input@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Ivan Orlov <ivan.orlov0322@...il.com>
Subject: [PATCH 2/2] HID: hidraw: make hidraw_class structure const

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

Cc: Jiri Kosina <jikos@...nel.org>
Cc: Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc: linux-input@...r.kernel.org
Cc: Ivan Orlov <ivan.orlov0322@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/hid/hidraw.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c
index 93e62b161501..d44e7a052584 100644
--- a/drivers/hid/hidraw.c
+++ b/drivers/hid/hidraw.c
@@ -32,7 +32,9 @@
 
 static int hidraw_major;
 static struct cdev hidraw_cdev;
-static struct class *hidraw_class;
+static const struct class hidraw_class = {
+	.name = "hidraw",
+};
 static struct hidraw *hidraw_table[HIDRAW_MAX_DEVICES];
 static DECLARE_RWSEM(minors_rwsem);
 
@@ -324,7 +326,7 @@ static void drop_ref(struct hidraw *hidraw, int exists_bit)
 			hid_hw_close(hidraw->hid);
 			wake_up_interruptible(&hidraw->wait);
 		}
-		device_destroy(hidraw_class,
+		device_destroy(&hidraw_class,
 			       MKDEV(hidraw_major, hidraw->minor));
 	} else {
 		--hidraw->open;
@@ -564,7 +566,7 @@ int hidraw_connect(struct hid_device *hid)
 		goto out;
 	}
 
-	dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor),
+	dev->dev = device_create(&hidraw_class, &hid->dev, MKDEV(hidraw_major, minor),
 				 NULL, "%s%d", "hidraw", minor);
 
 	if (IS_ERR(dev->dev)) {
@@ -618,11 +620,9 @@ int __init hidraw_init(void)
 
 	hidraw_major = MAJOR(dev_id);
 
-	hidraw_class = class_create("hidraw");
-	if (IS_ERR(hidraw_class)) {
-		result = PTR_ERR(hidraw_class);
+	result = class_register(&hidraw_class);
+	if (result)
 		goto error_cdev;
-	}
 
         cdev_init(&hidraw_cdev, &hidraw_ops);
 	result = cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES);
@@ -634,7 +634,7 @@ int __init hidraw_init(void)
 	return result;
 
 error_class:
-	class_destroy(hidraw_class);
+	class_unregister(&hidraw_class);
 error_cdev:
 	unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES);
 	goto out;
@@ -645,7 +645,7 @@ void hidraw_exit(void)
 	dev_t dev_id = MKDEV(hidraw_major, 0);
 
 	cdev_del(&hidraw_cdev);
-	class_destroy(hidraw_class);
+	class_unregister(&hidraw_class);
 	unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES);
 
 }
-- 
2.41.0