diff options
Diffstat (limited to 'drivers/base/bus.c')
| -rw-r--r-- | drivers/base/bus.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/base/bus.c b/drivers/base/bus.c index 87c44661dcad..1040c724e50c 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -1288,6 +1288,33 @@ int subsys_virtual_register(struct bus_type *subsys, } EXPORT_SYMBOL_GPL(subsys_virtual_register); +/** + * driver_find - locate driver on a bus by its name. + * @name: name of the driver. + * @bus: bus to scan for the driver. + * + * Call kset_find_obj() to iterate over list of drivers on + * a bus to find driver by name. Return driver if found. + * + * This routine provides no locking to prevent the driver it returns + * from being unregistered or unloaded while the caller is using it. + * The caller is responsible for preventing this. + */ +struct device_driver *driver_find(const char *name, struct bus_type *bus) +{ + struct kobject *k = kset_find_obj(bus->p->drivers_kset, name); + 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; +} +EXPORT_SYMBOL_GPL(driver_find); + int __init buses_init(void) { bus_kset = kset_create_and_add("bus", &bus_uevent_ops, NULL); |