linux-kernel - [PATCH] tc: make tc_bus

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Message-Id: <20240213-bus_cleanup-tc-v1-1-5ed32393a73a@marliere.net>
Date: Tue, 13 Feb 2024 11:45:25 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: "Maciej W. Rozycki" <macro@...am.me.uk>, 
 Ralf Baechle <ralf@...ux-mips.org>
Cc: linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH] tc: make tc_bus_type const

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