[PATCH] most: replace cdev_component->class with a const struct class

[Jori Koolstra]

The class_create() call has been deprecated in favor of class_register()
as the driver core now allows for a struct class to be in read-only
memory. Replace cdev_component->class with a const struct class and drop
the class_create() call. Compile tested only.

Link: https://lore.kernel.org/all/2023040244-duffel-pushpin-f738@gregkh/

Suggested-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Jori Koolstra <jkoolstra@xxxxxxxxx>
---
 drivers/most/most_cdev.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/most/most_cdev.c b/drivers/most/most_cdev.c
index b31dc824466f..5df508d8d60a 100644
--- a/drivers/most/most_cdev.c
+++ b/drivers/most/most_cdev.c
@@ -19,11 +19,14 @@
 
 #define CHRDEV_REGION_SIZE 50
 
+static const struct class most_cdev_class = {
+	.name		= "most_cdev"
+};
+
 static struct cdev_component {
 	dev_t devno;
 	struct ida minor_id;
 	unsigned int major;
-	struct class *class;
 	struct most_component cc;
 } comp;
 
@@ -91,7 +94,7 @@ static void destroy_cdev(struct comp_channel *c)
 {
 	unsigned long flags;
 
-	device_destroy(comp.class, c->devno);
+	device_destroy(&most_cdev_class, c->devno);
 	cdev_del(&c->cdev);
 	spin_lock_irqsave(&ch_list_lock, flags);
 	list_del(&c->list);
@@ -455,7 +458,7 @@ static int comp_probe(struct most_interface *iface, int channel_id,
 	spin_lock_irqsave(&ch_list_lock, cl_flags);
 	list_add_tail(&c->list, &channel_list);
 	spin_unlock_irqrestore(&ch_list_lock, cl_flags);
-	c->dev = device_create(comp.class, NULL, c->devno, NULL, "%s", name);
+	c->dev = device_create(&most_cdev_class, NULL, c->devno, NULL, "%s", name);
 
 	if (IS_ERR(c->dev)) {
 		retval = PTR_ERR(c->dev);
@@ -487,13 +490,14 @@ static struct cdev_component comp = {
 	},
 };
 
+
 static int __init most_cdev_init(void)
 {
 	int err;
 
-	comp.class = class_create("most_cdev");
-	if (IS_ERR(comp.class))
-		return PTR_ERR(comp.class);
+	err = class_register(&most_cdev_class);
+	if (err)
+		return err;
 
 	ida_init(&comp.minor_id);
 
@@ -515,7 +519,7 @@ static int __init most_cdev_init(void)
 	unregister_chrdev_region(comp.devno, CHRDEV_REGION_SIZE);
 dest_ida:
 	ida_destroy(&comp.minor_id);
-	class_destroy(comp.class);
+	class_unregister(&most_cdev_class);
 	return err;
 }
 
@@ -532,7 +536,7 @@ static void __exit most_cdev_exit(void)
 	}
 	unregister_chrdev_region(comp.devno, CHRDEV_REGION_SIZE);
 	ida_destroy(&comp.minor_id);
-	class_destroy(comp.class);
+	class_unregister(&most_cdev_class);
 }
 
 module_init(most_cdev_init);

base-commit: d466c332e106fe666d1e2f5a24d08e308bebbfa1
-- 
2.53.0