diff options
| -rw-r--r-- | drivers/base/bus.c | 34 | ||||
| -rw-r--r-- | drivers/base/core.c | 17 | ||||
| -rw-r--r-- | drivers/base/driver.c | 15 | ||||
| -rw-r--r-- | include/linux/klist.h | 8 | ||||
| -rw-r--r-- | lib/klist.c | 18 |
5 files changed, 84 insertions, 8 deletions
diff --git a/drivers/base/bus.c b/drivers/base/bus.c index 17e96698410..03204bfd17a 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -568,6 +568,36 @@ static void bus_remove_attrs(struct bus_type * bus) } } +static void klist_devices_get(struct klist_node *n) +{ + struct device *dev = container_of(n, struct device, knode_bus); + + get_device(dev); +} + +static void klist_devices_put(struct klist_node *n) +{ + struct device *dev = container_of(n, struct device, knode_bus); + + put_device(dev); +} + +static void klist_drivers_get(struct klist_node *n) +{ + struct device_driver *drv = container_of(n, struct device_driver, + knode_bus); + + get_driver(drv); +} + +static void klist_drivers_put(struct klist_node *n) +{ + struct device_driver *drv = container_of(n, struct device_driver, + knode_bus); + + put_driver(drv); +} + /** * bus_register - register a bus with the system. * @bus: bus. @@ -602,8 +632,8 @@ int bus_register(struct bus_type * bus) if (retval) goto bus_drivers_fail; - klist_init(&bus->klist_devices); - klist_init(&bus->klist_drivers); + klist_init(&bus->klist_devices, klist_devices_get, klist_devices_put); + klist_init(&bus->klist_drivers, klist_drivers_get, klist_drivers_put); bus_add_attrs(bus); pr_debug("bus type '%s' registered\n", bus->name); diff --git a/drivers/base/core.c b/drivers/base/core.c index c8a33df0076..6ab73f5c799 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -191,6 +191,20 @@ void device_remove_file(struct device * dev, struct device_attribute * attr) } } +static void klist_children_get(struct klist_node *n) +{ + struct device *dev = container_of(n, struct device, knode_parent); + + get_device(dev); +} + +static void klist_children_put(struct klist_node *n) +{ + struct device *dev = container_of(n, struct device, knode_parent); + + put_device(dev); +} + /** * device_initialize - init device structure. @@ -207,7 +221,8 @@ void device_initialize(struct device *dev) { kobj_set_kset_s(dev, devices_subsys); kobject_init(&dev->kobj); - klist_init(&dev->klist_children); + klist_init(&dev->klist_children, klist_children_get, + klist_children_put); INIT_LIST_HEAD(&dev->dma_pools); init_MUTEX(&dev->sem); } diff --git a/drivers/base/driver.c b/drivers/base/driver.c index 291c5954a3a..ef3fe513e39 100644 --- a/drivers/base/driver.c +++ b/drivers/base/driver.c @@ -142,6 +142,19 @@ void put_driver(struct device_driver * drv) kobject_put(&drv->kobj); } +static void klist_devices_get(struct klist_node *n) +{ + struct device *dev = container_of(n, struct device, knode_driver); + + get_device(dev); +} + +static void klist_devices_put(struct klist_node *n) +{ + struct device *dev = container_of(n, struct device, knode_driver); + + put_device(dev); +} /** * driver_register - register driver with bus @@ -157,7 +170,7 @@ void put_driver(struct device_driver * drv) */ int driver_register(struct device_driver * drv) { - klist_init(&drv->klist_devices); + klist_init(&drv->klist_devices, klist_devices_get, klist_devices_put); init_completion(&drv->unloaded); return bus_add_driver(drv); } diff --git a/include/linux/klist.h b/include/linux/klist.h index c4d1fae4dd8..74071254c9d 100644 --- a/include/linux/klist.h +++ b/include/linux/klist.h @@ -17,15 +17,17 @@ #include <linux/kref.h> #include <linux/list.h> - +struct klist_node; struct klist { spinlock_t k_lock; struct list_head k_list; + void (*get)(struct klist_node *); + void (*put)(struct klist_node *); }; -extern void klist_init(struct klist * k); - +extern void klist_init(struct klist * k, void (*get)(struct klist_node *), + void (*put)(struct klist_node *)); struct klist_node { struct klist * n_klist; diff --git a/lib/klist.c b/lib/klist.c index a70c836c5c4..bb2f3551d50 100644 --- a/lib/klist.c +++ b/lib/klist.c @@ -42,12 +42,23 @@ /** * klist_init - Initialize a klist structure. * @k: The klist we're initializing. + * @get: The get function for the embedding object (NULL if none) + * @put: The put function for the embedding object (NULL if none) + * + * Initialises the klist structure. If the klist_node structures are + * going to be embedded in refcounted objects (necessary for safe + * deletion) then the get/put arguments are used to initialise + * functions that take and release references on the embedding + * objects. */ -void klist_init(struct klist * k) +void klist_init(struct klist * k, void (*get)(struct klist_node *), + void (*put)(struct klist_node *)) { INIT_LIST_HEAD(&k->k_list); spin_lock_init(&k->k_lock); + k->get = get; + k->put = put; } EXPORT_SYMBOL_GPL(klist_init); @@ -74,6 +85,8 @@ static void klist_node_init(struct klist * k, struct klist_node * n) init_completion(&n->n_removed); kref_init(&n->n_ref); n->n_klist = k; + if (k->get) + k->get(n); } @@ -110,9 +123,12 @@ EXPORT_SYMBOL_GPL(klist_add_tail); static void klist_release(struct kref * kref) { struct klist_node * n = container_of(kref, struct klist_node, n_ref); + void (*put)(struct klist_node *) = n->n_klist->put; list_del(&n->n_node); complete(&n->n_removed); n->n_klist = NULL; + if (put) + put(n); } static int klist_dec_and_del(struct klist_node * n) |