linux-kernel - [PATCH v2] dio: make dio_bus

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Message-Id: <20240212-bus_cleanup-dio-v2-1-3b1ba4c0547d@marliere.net>
Date: Mon, 12 Feb 2024 08:41:01 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-kernel@...r.kernel.org, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH v2] dio: make dio_bus_type const

Now that the driver core can properly handle constant struct bus_type,
move the dio_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>
---
Changes in v2:
- Added missing 'const' to dio.h
- Link to v1: https://lore.kernel.org/r/20240211-bus_cleanup-dio-v1-1-02140fbc5289@marliere.net
---
 drivers/dio/dio-driver.c | 2 +-
 include/linux/dio.h      | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/dio/dio-driver.c b/drivers/dio/dio-driver.c
index 69c46935ffc7..2d9fa6011945 100644
--- a/drivers/dio/dio-driver.c
+++ b/drivers/dio/dio-driver.c
@@ -123,7 +123,7 @@ static int dio_bus_match(struct device *dev, struct device_driver *drv)
 }
 
 
-struct bus_type dio_bus_type = {
+const struct bus_type dio_bus_type = {
 	.name	= "dio",
 	.match	= dio_bus_match,
 	.probe	= dio_device_probe,
diff --git a/include/linux/dio.h b/include/linux/dio.h
index 5abd07361eb5..2b5923909f96 100644
--- a/include/linux/dio.h
+++ b/include/linux/dio.h
@@ -68,7 +68,7 @@ struct dio_bus {
 };
 
 extern struct dio_bus dio_bus;      /* Single DIO bus */
-extern struct bus_type dio_bus_type;
+extern const struct bus_type dio_bus_type;
 
     /*
      *  DIO device IDs

---
base-commit: 047371968ffc470769f541d6933e262dc7085456
change-id: 20240211-bus_cleanup-dio-6cafa80e759b

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