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 tc_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@linuxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@marliere.net>
---
 drivers/tc/tc-driver.c | 2 +-
 include/linux/tc.h     | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/tc/tc-driver.c b/drivers/tc/tc-driver.c
index d45f2c1ff341..1c9d983a5a1f 100644
--- a/drivers/tc/tc-driver.c
+++ b/drivers/tc/tc-driver.c
@@ -95,7 +95,7 @@ static int tc_bus_match(struct device *dev, struct device_driver *drv)
 	return 0;
 }
 
-struct bus_type tc_bus_type = {
+const struct bus_type tc_bus_type = {
 	.name	= "tc",
 	.match	= tc_bus_match,
 };
diff --git a/include/linux/tc.h b/include/linux/tc.h
index a60639f37963..1638660abf5e 100644
--- a/include/linux/tc.h
+++ b/include/linux/tc.h
@@ -120,7 +120,7 @@ static inline unsigned long tc_get_speed(struct tc_bus *tbus)
 
 #ifdef CONFIG_TC
 
-extern struct bus_type tc_bus_type;
+extern const struct bus_type tc_bus_type;
 
 extern int tc_register_driver(struct tc_driver *tdrv);
 extern void tc_unregister_driver(struct tc_driver *tdrv);

---
base-commit: 716f4aaa7b48a55c73d632d0657b35342b1fefd7
change-id: 20240213-bus_cleanup-tc-57a088fbfb73

Best regards,
-- 
Ricardo B. Marliere <ricardo@marliere.net>

On Tue, Feb 13, 2024 at 11:45:25AM -0300, Ricardo B. Marliere wrote:
> 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 tc_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@linuxfoundation.org>
> Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Signed-off-by: Ricardo B. Marliere <ricardo@marliere.net>

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

On Tue, 13 Feb 2024, Ricardo B. Marliere wrote:

> 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 tc_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@linuxfoundation.org>
> Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Signed-off-by: Ricardo B. Marliere <ricardo@marliere.net>
> ---

 It builds, therefore it works, so:

Acked-by: Maciej W. Rozycki <macro@orcam.me.uk>

Thank you for your contribution!

  Maciej