USB: mark all struct bus_type as const

Now that the driver core can properly handle constant struct bus_type,
move all of the USB subsystem struct bus_type structures as const,
placing them into read-only memory which can not be modified at runtime.

Cc: Johan Hovold <johan@kernel.org>
Cc: Evan Green <evgreen@chromium.org>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: linux-usb@vger.kernel.org
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20230313182918.1312597-36-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

8 files changed, 9 insertions, 9 deletions

diff --git a/drivers/usb/common/ulpi.c b/drivers/usb/common/ulpi.c
index a98b2108376a..8305a5dfb910 100644
--- a/drivers/usb/common/ulpi.c
+++ b/drivers/usb/common/ulpi.c
@@ -90,7 +90,7 @@ static void ulpi_remove(struct device *dev)
 		drv->remove(to_ulpi_dev(dev));
 }
 
-static struct bus_type ulpi_bus = {
+static const struct bus_type ulpi_bus = {
 	.name = "ulpi",
 	.match = ulpi_match,
 	.uevent = ulpi_uevent,
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index a0e076c6f3a4..f58a0299fb3b 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -2025,7 +2025,7 @@ int usb_disable_usb2_hardware_lpm(struct usb_device *udev)
 
 #endif /* CONFIG_PM */
 
-struct bus_type usb_bus_type = {
+const struct bus_type usb_bus_type = {
 	.name =		"usb",
 	.match =	usb_device_match,
 	.uevent =	usb_uevent,
diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index 0eac7d4285d1..cd434af259c3 100644
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -140,7 +140,7 @@ static inline int usb_disable_usb2_hardware_lpm(struct usb_device *udev)
 
 #endif
 
-extern struct bus_type usb_bus_type;
+extern const struct bus_type usb_bus_type;
 extern struct mutex usb_port_peer_mutex;
 extern struct device_type usb_device_type;
 extern struct device_type usb_if_device_type;
diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c
index df930b041c33..d919f0743a0a 100644
--- a/drivers/usb/gadget/udc/core.c
+++ b/drivers/usb/gadget/udc/core.c
@@ -26,7 +26,7 @@
 
 static DEFINE_IDA(gadget_id_numbers);
 
-static struct bus_type gadget_bus_type;
+static const struct bus_type gadget_bus_type;
 
 /**
  * struct usb_udc - describes one usb device controller
@@ -1747,7 +1747,7 @@ static int usb_udc_uevent(const struct device *dev, struct kobj_uevent_env *env)
 	return 0;
 }
 
-static struct bus_type gadget_bus_type = {
+static const struct bus_type gadget_bus_type = {
 	.name = "gadget",
 	.probe = gadget_bind_driver,
 	.remove = gadget_unbind_driver,
diff --git a/drivers/usb/serial/bus.c b/drivers/usb/serial/bus.c
index 9e38142acd38..3eb8dc3a1a8f 100644
--- a/drivers/usb/serial/bus.c
+++ b/drivers/usb/serial/bus.c
@@ -144,7 +144,7 @@ static void free_dynids(struct usb_serial_driver *drv)
 	spin_unlock(&drv->dynids.lock);
 }
 
-struct bus_type usb_serial_bus_type = {
+const struct bus_type usb_serial_bus_type = {
 	.name =		"usb-serial",
 	.match =	usb_serial_device_match,
 	.probe =	usb_serial_device_probe,
diff --git a/drivers/usb/typec/bus.c b/drivers/usb/typec/bus.c
index 098f0efaa58d..fe5b9a2e61f5 100644
--- a/drivers/usb/typec/bus.c
+++ b/drivers/usb/typec/bus.c
@@ -431,7 +431,7 @@ static void typec_remove(struct device *dev)
 	adev->ops = NULL;
 }
 
-struct bus_type typec_bus = {
+const struct bus_type typec_bus = {
 	.name = "typec",
 	.dev_groups = typec_groups,
 	.match = typec_match,
diff --git a/drivers/usb/typec/bus.h b/drivers/usb/typec/bus.h
index c89168857417..643b8c81786d 100644
--- a/drivers/usb/typec/bus.h
+++ b/drivers/usb/typec/bus.h
@@ -28,7 +28,7 @@ struct altmode {
 
 #define to_altmode(d) container_of(d, struct altmode, adev)
 
-extern struct bus_type typec_bus;
+extern const struct bus_type typec_bus;
 extern const struct device_type typec_altmode_dev_type;
 
 #define is_typec_altmode(_dev_) (_dev_->type == &typec_altmode_dev_type)
diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index f7bfedb740f5..7eeb5f9c4f0d 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -378,7 +378,7 @@ void usb_serial_handle_dcd_change(struct usb_serial_port *usb_port,
 int usb_serial_bus_register(struct usb_serial_driver *device);
 void usb_serial_bus_deregister(struct usb_serial_driver *device);
 
-extern struct bus_type usb_serial_bus_type;
+extern const struct bus_type usb_serial_bus_type;
 extern struct tty_driver *usb_serial_tty_driver;
 
 static inline void usb_serial_debug_data(struct device *dev,