[PATCH] platform: Make platform_bus_type constant

[Kunwu Chan]

From: Kunwu Chan <chentao@xxxxxxxxxx>

Since commit d492cc2573a0 ("driver core: device.h: make struct
bus_type a const *"), the driver core can properly handle constant
struct bus_type, move the platform_bus_type variable to be a constant
structure as well, placing it into read-only memory which can not be
modified at runtime.

Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Suggested-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Kunwu Chan <chentao@xxxxxxxxxx>
---
 drivers/base/platform.c         | 2 +-
 include/linux/platform_device.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 4c3ee6521ba5..6f2a33722c52 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -1474,7 +1474,7 @@ static const struct dev_pm_ops platform_dev_pm_ops = {
 	USE_PLATFORM_PM_SLEEP_OPS
 };
 
-struct bus_type platform_bus_type = {
+const struct bus_type platform_bus_type = {
 	.name		= "platform",
 	.dev_groups	= platform_dev_groups,
 	.match		= platform_match,
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index d422db6eec63..7132623e4658 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -52,7 +52,7 @@ struct platform_device {
 extern int platform_device_register(struct platform_device *);
 extern void platform_device_unregister(struct platform_device *);
 
-extern struct bus_type platform_bus_type;
+extern const struct bus_type platform_bus_type;
 extern struct device platform_bus;
 
 extern struct resource *platform_get_resource(struct platform_device *,
-- 
2.41.0