linux-kernel - [PATCH] staging: fieldbus: make controller

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Date:   Thu,  5 Oct 2023 15:43:53 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sven Van Asbroeck <TheSven73@...il.com>
Subject: [PATCH] staging: fieldbus: make controller_class constant

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: Sven Van Asbroeck <TheSven73@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/staging/fieldbus/anybuss/arcx-anybus.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/fieldbus/anybuss/arcx-anybus.c b/drivers/staging/fieldbus/anybuss/arcx-anybus.c
index 6f69758a8b27..34d18b09bedd 100644
--- a/drivers/staging/fieldbus/anybuss/arcx-anybus.c
+++ b/drivers/staging/fieldbus/anybuss/arcx-anybus.c
@@ -218,7 +218,10 @@ static const struct regulator_desc can_power_desc = {
 	.ops = &can_power_ops,
 };
 
-static struct class *controller_class;
+static const struct class controller_class = {
+	.name = "arcx_anybus_controller",
+};
+
 static DEFINE_IDA(controller_index_ida);
 
 static int controller_probe(struct platform_device *pdev)
@@ -301,7 +304,7 @@ static int controller_probe(struct platform_device *pdev)
 		err = -ENOMEM;
 		goto out_ida;
 	}
-	cd->class_dev->class = controller_class;
+	cd->class_dev->class = &controller_class;
 	cd->class_dev->groups = controller_attribute_groups;
 	cd->class_dev->parent = dev;
 	cd->class_dev->id = id;
@@ -351,12 +354,12 @@ static int __init controller_init(void)
 {
 	int err;
 
-	controller_class = class_create("arcx_anybus_controller");
-	if (IS_ERR(controller_class))
-		return PTR_ERR(controller_class);
+	err = class_register(&controller_class);
+	if (err)
+		return err;
 	err = platform_driver_register(&controller_driver);
 	if (err)
-		class_destroy(controller_class);
+		class_unregister(&controller_class);
 
 	return err;
 }
@@ -364,7 +367,7 @@ static int __init controller_init(void)
 static void __exit controller_exit(void)
 {
 	platform_driver_unregister(&controller_driver);
-	class_destroy(controller_class);
+	class_unregister(&controller_class);
 	ida_destroy(&controller_index_ida);
 }
 
-- 
2.42.0