driver core: make the bus_type in struct device_driver constant

The pointer to struct bus_type in struct device_driver should only be
pointing to something that can never change now that the driver core has
fixed up the previously writable fields.  So mark it as a constant
pointer to enforce this and move forward with the goal of moving
bus_type into read-only memory.

Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Link: https://lore.kernel.org/r/20230313182918.1312597-28-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/linux/device/driver.h b/include/linux/device/driver.h
index ceb0e47..0f22a6f 100644 (file)
--- a/include/linux/device/driver.h
+++ b/include/linux/device/driver.h
@@ -95,7 +95,7 @@ enum probe_type {
  */
 struct device_driver {
        const char              *name;
-       struct bus_type         *bus;
+       const struct bus_type   *bus;
 
        struct module           *owner;
        const char              *mod_name;      /* used for built-in modules */