[PATCH v2 3/3] fpga: region: make fpga_region_class a static const structure

[Ivan Orlov]

Now that the driver core allows for struct class to be in read-only
memory, move the fpga_region_class structure to be declared at build
time placing it into read-only memory, instead of having to be
dynamically allocated at boot time.

Suggested-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Ivan Orlov <ivan.orlov0322@xxxxxxxxx>
---
 drivers/fpga/fpga-region.c | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c
index ccf6fdab1360..6abd8a154047 100644
--- a/drivers/fpga/fpga-region.c
+++ b/drivers/fpga/fpga-region.c
@@ -16,7 +16,7 @@
 #include <linux/spinlock.h>
 
 static DEFINE_IDA(fpga_region_ida);
-static struct class *fpga_region_class;
+static const struct class fpga_region_class;
 
 struct fpga_region *
 fpga_region_class_find(struct device *start, const void *data,
@@ -24,7 +24,7 @@ fpga_region_class_find(struct device *start, const void *data,
 {
 	struct device *dev;
 
-	dev = class_find_device(fpga_region_class, start, data, match);
+	dev = class_find_device(&fpga_region_class, start, data, match);
 	if (!dev)
 		return NULL;
 
@@ -216,7 +216,7 @@ fpga_region_register_full(struct device *parent, const struct fpga_region_info *
 	mutex_init(&region->mutex);
 	INIT_LIST_HEAD(&region->bridge_list);
 
-	region->dev.class = fpga_region_class;
+	region->dev.class = &fpga_region_class;
 	region->dev.parent = parent;
 	region->dev.of_node = parent->of_node;
 	region->dev.id = id;
@@ -287,25 +287,24 @@ static void fpga_region_dev_release(struct device *dev)
 	kfree(region);
 }
 
+static const struct class fpga_region_class = {
+	.name = "fpga_region",
+	.dev_groups = fpga_region_groups,
+	.dev_release = fpga_region_dev_release,
+};
+
 /**
  * fpga_region_init - init function for fpga_region class
  * Creates the fpga_region class and registers a reconfig notifier.
  */
 static int __init fpga_region_init(void)
 {
-	fpga_region_class = class_create("fpga_region");
-	if (IS_ERR(fpga_region_class))
-		return PTR_ERR(fpga_region_class);
-
-	fpga_region_class->dev_groups = fpga_region_groups;
-	fpga_region_class->dev_release = fpga_region_dev_release;
-
-	return 0;
+	return class_register(&fpga_region_class);
 }
 
 static void __exit fpga_region_exit(void)
 {
-	class_destroy(fpga_region_class);
+	class_unregister(&fpga_region_class);
 	ida_destroy(&fpga_region_ida);
 }
 
-- 
2.34.1