decl_subsys(bus, &ktype_bus, NULL);
-/* Manually detach a device from it's associated driver. */
+#ifdef CONFIG_HOTPLUG
+
+/* Manually detach a device from its associated driver. */
static int driver_helper(struct device *dev, void *data)
{
const char *name = data;
int err = -ENODEV;
dev = bus_find_device(bus, NULL, (void *)buf, driver_helper);
- if ((dev) &&
- (dev->driver == drv)) {
+ if (dev && dev->driver == drv) {
+ if (dev->parent) /* Needed for USB */
+ down(&dev->parent->sem);
device_release_driver(dev);
+ if (dev->parent)
+ up(&dev->parent->sem);
err = count;
}
- if (err)
- return err;
- return count;
+ put_device(dev);
+ put_bus(bus);
+ return err;
}
static DRIVER_ATTR(unbind, S_IWUSR, NULL, driver_unbind);
int err = -ENODEV;
dev = bus_find_device(bus, NULL, (void *)buf, driver_helper);
- if ((dev) &&
- (dev->driver == NULL)) {
+ if (dev && dev->driver == NULL) {
+ if (dev->parent) /* Needed for USB */
+ down(&dev->parent->sem);
down(&dev->sem);
err = driver_probe_device(drv, dev);
up(&dev->sem);
- put_device(dev);
+ if (dev->parent)
+ up(&dev->parent->sem);
}
- if (err)
- return err;
- return count;
+ put_device(dev);
+ put_bus(bus);
+ return err;
}
static DRIVER_ATTR(bind, S_IWUSR, NULL, driver_bind);
+#endif
static struct device * next_device(struct klist_iter * i)
{
}
}
+#ifdef CONFIG_HOTPLUG
+/*
+ * Thanks to drivers making their tables __devinit, we can't allow manual
+ * bind and unbind from userspace unless CONFIG_HOTPLUG is enabled.
+ */
+static void add_bind_files(struct device_driver *drv)
+{
+ driver_create_file(drv, &driver_attr_unbind);
+ driver_create_file(drv, &driver_attr_bind);
+}
+
+static void remove_bind_files(struct device_driver *drv)
+{
+ driver_remove_file(drv, &driver_attr_bind);
+ driver_remove_file(drv, &driver_attr_unbind);
+}
+#else
+static inline void add_bind_files(struct device_driver *drv) {}
+static inline void remove_bind_files(struct device_driver *drv) {}
+#endif
/**
* bus_add_driver - Add a driver to the bus.
module_add_driver(drv->owner, drv);
driver_add_attrs(bus, drv);
- driver_create_file(drv, &driver_attr_unbind);
- driver_create_file(drv, &driver_attr_bind);
+ add_bind_files(drv);
}
return error;
}
void bus_remove_driver(struct device_driver * drv)
{
if (drv->bus) {
- driver_remove_file(drv, &driver_attr_bind);
- driver_remove_file(drv, &driver_attr_unbind);
+ remove_bind_files(drv);
driver_remove_attrs(drv->bus, drv);
klist_remove(&drv->knode_bus);
pr_debug("bus %s: remove driver %s\n", drv->bus->name, drv->name);
/* Helper for bus_rescan_devices's iter */
static int bus_rescan_devices_helper(struct device *dev, void *data)
{
- if (!dev->driver)
+ if (!dev->driver) {
+ if (dev->parent) /* Needed for USB */
+ down(&dev->parent->sem);
device_attach(dev);
+ if (dev->parent)
+ up(&dev->parent->sem);
+ }
return 0;
}
bus_for_each_dev(bus, NULL, NULL, bus_rescan_devices_helper);
}
+/**
+ * device_reprobe - remove driver for a device and probe for a new driver
+ * @dev: the device to reprobe
+ *
+ * This function detaches the attached driver (if any) for the given
+ * device and restarts the driver probing process. It is intended
+ * to use if probing criteria changed during a devices lifetime and
+ * driver attachment should change accordingly.
+ */
+void device_reprobe(struct device *dev)
+{
+ if (dev->driver) {
+ if (dev->parent) /* Needed for USB */
+ down(&dev->parent->sem);
+ device_release_driver(dev);
+ if (dev->parent)
+ up(&dev->parent->sem);
+ }
+
+ bus_rescan_devices_helper(dev, NULL);
+}
+EXPORT_SYMBOL_GPL(device_reprobe);
struct bus_type * get_bus(struct bus_type * bus)
{