linux-kernel - [PATCH 4/4] usb: core: constify the struct device

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Message-Id: <20240218-device_cleanup-usb-v1-4-77423c4da262@marliere.net>
Date: Sun, 18 Feb 2024 16:18:12 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: Heikki Krogerus <heikki.krogerus@...ux.intel.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH 4/4] usb: core: constify the struct device_type usage

Since commit aed65af1cc2f ("drivers: make device_type const"), the driver
core can properly handle constant struct device_type. Move the
usb_device_type, usb_if_device_type, usb_ep_device_type and
usb_port_device_type variables to be constant structures as well, placing
it into read-only memory which can not be modified at runtime.

Signed-off-by: Ricardo B. Marliere <ricardo@...liere.net>
---
 drivers/usb/core/endpoint.c | 2 +-
 drivers/usb/core/message.c  | 2 +-
 drivers/usb/core/port.c     | 2 +-
 drivers/usb/core/usb.c      | 2 +-
 drivers/usb/core/usb.h      | 8 ++++----
 5 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/core/endpoint.c b/drivers/usb/core/endpoint.c
index a2530811cf7d..4b38b87a1343 100644
--- a/drivers/usb/core/endpoint.c
+++ b/drivers/usb/core/endpoint.c
@@ -141,7 +141,7 @@ static void ep_device_release(struct device *dev)
 	kfree(ep_dev);
 }
 
-struct device_type usb_ep_device_type = {
+const struct device_type usb_ep_device_type = {
 	.name =		"usb_endpoint",
 	.release = ep_device_release,
 };
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 077dfe48d01c..67316d271596 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -1849,7 +1849,7 @@ static int usb_if_uevent(const struct device *dev, struct kobj_uevent_env *env)
 	return 0;
 }
 
-struct device_type usb_if_device_type = {
+const struct device_type usb_if_device_type = {
 	.name =		"usb_interface",
 	.release =	usb_release_interface,
 	.uevent =	usb_if_uevent,
diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
index c628c1abc907..84d36172b040 100644
--- a/drivers/usb/core/port.c
+++ b/drivers/usb/core/port.c
@@ -429,7 +429,7 @@ static const struct dev_pm_ops usb_port_pm_ops = {
 #endif
 };
 
-struct device_type usb_port_device_type = {
+const struct device_type usb_port_device_type = {
 	.name =		"usb_port",
 	.release =	usb_port_device_release,
 	.pm =		&usb_port_pm_ops,
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index dc8d9228a5e7..a0c432b14b20 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -592,7 +592,7 @@ static char *usb_devnode(const struct device *dev,
 			 usb_dev->bus->busnum, usb_dev->devnum);
 }
 
-struct device_type usb_device_type = {
+const struct device_type usb_device_type = {
 	.name =		"usb_device",
 	.release =	usb_release_dev,
 	.uevent =	usb_dev_uevent,
diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index bfecb50773b6..b8324ea05b20 100644
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -144,10 +144,10 @@ static inline int usb_disable_usb2_hardware_lpm(struct usb_device *udev)
 extern const struct class usbmisc_class;
 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;
-extern struct device_type usb_ep_device_type;
-extern struct device_type usb_port_device_type;
+extern const struct device_type usb_device_type;
+extern const struct device_type usb_if_device_type;
+extern const struct device_type usb_ep_device_type;
+extern const struct device_type usb_port_device_type;
 extern struct usb_device_driver usb_generic_driver;
 
 static inline int is_usb_device(const struct device *dev)

-- 
2.43.0