[PATCH 15/21] driver core: bus: clean up driver_find()

Greg Kroah-Hartman
2023-02-08T11:15:07Z

Convert the driver_find() function to use bus_to_subsys() and not use
the back-pointer to the private structure.

Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/base/bus.c | 23 +++++++++++++++--------
1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 727de4c36d59..951d63c8e885 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -1302,16 +1302,23 @@ EXPORT_SYMBOL_GPL(subsys_virtual_register);
*/
struct device_driver *driver_find(const char *name, struct bus_type *bus)
{
- struct kobject *k = kset_find_obj(bus->p->drivers_kset, name);
+ struct subsys_private *sp = bus_to_subsys(bus);
+ struct kobject *k;
struct driver_private *priv;

- if (k) {
- /* Drop reference added by kset_find_obj() */
- kobject_put(k);
- priv = to_driver(k);
- return priv->driver;
- }
- return NULL;
+ if (!sp)
+ return NULL;
+
+ k = kset_find_obj(sp->drivers_kset, name);
+ subsys_put(sp);
+ if (!k)
+ return NULL;
+
+ priv = to_driver(k);
+
+ /* Drop reference added by kset_find_obj() */
+ kobject_put(k);
+ return priv->driver;
}
EXPORT_SYMBOL_GPL(driver_find);

--
2.39.1