Now that the driver core can properly handle constant struct bus_type,
move the cdx_bus_type variable to be a constant structure as well,
placing it into read-only memory which can not be modified at runtime.

Cc: Nipun Gupta <nipun.gupta@amd.com>
Cc: Nikhil Agarwal <nikhil.agarwal@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/cdx/cdx.c           | 4 ++--
 include/linux/cdx/cdx_bus.h | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/cdx/cdx.c b/drivers/cdx/cdx.c
index 092306ca2541..26f296b4a489 100644
--- a/drivers/cdx/cdx.c
+++ b/drivers/cdx/cdx.c
@@ -170,7 +170,7 @@ static int cdx_unregister_device(struct device *dev,
 	return 0;
 }
 
-static void cdx_unregister_devices(struct bus_type *bus)
+static void cdx_unregister_devices(const struct bus_type *bus)
 {
 	/* Reset all the devices attached to cdx bus */
 	bus_for_each_dev(bus, NULL, NULL, cdx_unregister_device);
@@ -651,7 +651,7 @@ static struct attribute *cdx_bus_attrs[] = {
 };
 ATTRIBUTE_GROUPS(cdx_bus);
 
-struct bus_type cdx_bus_type = {
+const struct bus_type cdx_bus_type = {
 	.name		= "cdx",
 	.match		= cdx_bus_match,
 	.probe		= cdx_probe,
diff --git a/include/linux/cdx/cdx_bus.h b/include/linux/cdx/cdx_bus.h
index 79bb80e56790..b1ba97f6c9ad 100644
--- a/include/linux/cdx/cdx_bus.h
+++ b/include/linux/cdx/cdx_bus.h
@@ -234,7 +234,7 @@ int __must_check __cdx_driver_register(struct cdx_driver *cdx_driver,
  */
 void cdx_driver_unregister(struct cdx_driver *cdx_driver);
 
-extern struct bus_type cdx_bus_type;
+extern const struct bus_type cdx_bus_type;
 
 /**
  * cdx_dev_reset - Reset CDX device
-- 
2.51.0

On 14-09-2025 19:12, Greg Kroah-Hartman wrote:
> Now that the driver core can properly handle constant struct bus_type,
> move the cdx_bus_type variable to be a constant structure as well,
> placing it into read-only memory which can not be modified at runtime.
> 
> Cc: Nipun Gupta <nipun.gupta@amd.com>
> Cc: Nikhil Agarwal <nikhil.agarwal@amd.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Acked-by: Nipun Gupta <nipun.gupta@amd.com>