firmware: coreboot: store owner from modules with coreboot_driver_register()

Modules registering driver with coreboot_driver_register() might
forget to set .owner field.  The field is used by some of other kernel
parts for reference counting (try_module_get()), so it is expected that
drivers will set it.

Solve the problem by moving this task away from the drivers to the core
code, just like we did for platform_driver in
commit 9447057 ("platform_device: use a macro instead of
platform_driver_register").

Moving the .owner setting code to the core this effectively fixes
missing .owner in framebuffer-coreboot, memconsole-coreboot and vpd
drivers.

Signed-off-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Tzung-Bi Shih <[email protected]>

Author: krzk

drivers/firmware/google/coreboot_table.c

@@ -85,13 +85,15 @@ static void coreboot_device_release(struct device *dev)
 	kfree(device);
 }
 
-int coreboot_driver_register(struct coreboot_driver *driver)
+int __coreboot_driver_register(struct coreboot_driver *driver,
+			       struct module *owner)
 {
 	driver->drv.bus = &coreboot_bus_type;
+	driver->drv.owner = owner;
 
 	return driver_register(&driver->drv);
 }
-EXPORT_SYMBOL(coreboot_driver_register);
+EXPORT_SYMBOL(__coreboot_driver_register);
 
 void coreboot_driver_unregister(struct coreboot_driver *driver)
 {

drivers/firmware/google/coreboot_table.h

@@ -97,8 +97,12 @@ struct coreboot_driver {
 	const struct coreboot_device_id *id_table;
 };
 
+/* use a macro to avoid include chaining to get THIS_MODULE */
+#define coreboot_driver_register(driver) \
+	__coreboot_driver_register(driver, THIS_MODULE)
 /* Register a driver that uses the data from a coreboot table. */
-int coreboot_driver_register(struct coreboot_driver *driver);
+int __coreboot_driver_register(struct coreboot_driver *driver,
+			       struct module *owner);
 
 /* Unregister a driver that uses the data from a coreboot table. */
 void coreboot_driver_unregister(struct coreboot_driver *driver);