linux-kernel - [PATCH 1/2] Input: synaptics-rmi4

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Message-Id: <20240210-bus_cleanup-input2-v1-1-0daef7e034e0@marliere.net>
Date: Sat, 10 Feb 2024 12:15:01 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH 1/2] Input: synaptics-rmi4 - make rmi_bus_type const

Now that the driver core can properly handle constant struct bus_type,
move the variable rmi_bus_type 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/input/rmi4/rmi_bus.c | 2 +-
 drivers/input/rmi4/rmi_bus.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/input/rmi4/rmi_bus.c b/drivers/input/rmi4/rmi_bus.c
index 1b45b1d3077d..343030290d78 100644
--- a/drivers/input/rmi4/rmi_bus.c
+++ b/drivers/input/rmi4/rmi_bus.c
@@ -344,7 +344,7 @@ static int rmi_bus_match(struct device *dev, struct device_driver *drv)
 	return physical || rmi_function_match(dev, drv);
 }

-struct bus_type rmi_bus_type = {
+const struct bus_type rmi_bus_type = {
 	.match		= rmi_bus_match,
 	.name		= "rmi4",
 };
diff --git a/drivers/input/rmi4/rmi_bus.h b/drivers/input/rmi4/rmi_bus.h
index 25df6320f9f1..ea46ad9447ec 100644
--- a/drivers/input/rmi4/rmi_bus.h
+++ b/drivers/input/rmi4/rmi_bus.h
@@ -185,7 +185,7 @@ static inline int rmi_write_block(struct rmi_device *d, u16 addr,

 int rmi_for_each_dev(void *data, int (*func)(struct device *dev, void *data));

-extern struct bus_type rmi_bus_type;
+extern const struct bus_type rmi_bus_type;

 int rmi_of_property_read_u32(struct device *dev, u32 *result,
 				const char *prop, bool optional);

-- 
2.43.0