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@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>
Link: https://lore.kernel.org/r/20240212-bus_cleanup-dio-v2-1-3b1ba4c0547d@marliere.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/dio/dio-driver.c b/drivers/dio/dio-driver.c
index 69c46935ffc78cef0c01bc2cffb352ef00d30207..2d9fa6011945d88bae6ba24f74ef8a2ff1b2ea84 100644 (file)
--- 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 5abd07361eb516b530937004a874bc758967a49a..2b5923909f963372f997020b53ae0f0db6f55679 100644 (file)
--- 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