[PATCH 1/3] staging: greybus: raw: make raw_class constant

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

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: Johan Hovold <johan@kernel.org>
Cc: Alex Elder <elder@kernel.org>
Cc: greybus-dev@lists.linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/staging/greybus/raw.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/staging/greybus/raw.c b/drivers/staging/greybus/raw.c
index 8bca8cb12cc6..a00978c8e1d2 100644
--- a/drivers/staging/greybus/raw.c
+++ b/drivers/staging/greybus/raw.c
@@ -32,7 +32,10 @@ struct raw_data {
 	u8 data[];
 };
 
-static struct class *raw_class;
+static const struct class raw_class = {
+	.name = "gb_raw",
+};
+
 static int raw_major;
 static const struct file_operations raw_fops;
 static DEFINE_IDA(minors);
@@ -195,7 +198,7 @@ static int gb_raw_probe(struct gb_bundle *bundle,
 	if (retval)
 		goto error_connection_disable;
 
-	raw->device = device_create(raw_class, &connection->bundle->dev,
+	raw->device = device_create(&raw_class, &connection->bundle->dev,
 				    raw->dev, raw, "gb!raw%d", minor);
 	if (IS_ERR(raw->device)) {
 		retval = PTR_ERR(raw->device);
@@ -229,7 +232,7 @@ static void gb_raw_disconnect(struct gb_bundle *bundle)
 	struct raw_data *temp;
 
 	// FIXME - handle removing a connection when the char device node is open.
-	device_destroy(raw_class, raw->dev);
+	device_destroy(&raw_class, raw->dev);
 	cdev_del(&raw->cdev);
 	gb_connection_disable(connection);
 	ida_simple_remove(&minors, MINOR(raw->dev));
@@ -340,11 +343,9 @@ static int raw_init(void)
 	dev_t dev;
 	int retval;
 
-	raw_class = class_create("gb_raw");
-	if (IS_ERR(raw_class)) {
-		retval = PTR_ERR(raw_class);
+	retval = class_register(&raw_class);
+	if (retval)
 		goto error_class;
-	}
 
 	retval = alloc_chrdev_region(&dev, 0, NUM_MINORS, "gb_raw");
 	if (retval < 0)
@@ -361,7 +362,7 @@ static int raw_init(void)
 error_gb:
 	unregister_chrdev_region(dev, NUM_MINORS);
 error_chrdev:
-	class_destroy(raw_class);
+	class_unregister(&raw_class);
 error_class:
 	return retval;
 }
@@ -371,7 +372,7 @@ static void __exit raw_exit(void)
 {
 	greybus_deregister(&gb_raw_driver);
 	unregister_chrdev_region(MKDEV(raw_major, 0), NUM_MINORS);
-	class_destroy(raw_class);
+	class_unregister(&raw_class);
 	ida_destroy(&minors);
 }
 module_exit(raw_exit);
-- 
2.42.0