HID: core: rewrite the hid-generic automatic unbind

We actually can have the unbind/rebind logic in hid-core.c, leaving
only the match function in hid-generic.

This makes hid-generic simpler and the whole logic simpler too.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 24 insertions, 11 deletions

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index c2560aae5542..c058bb911ca1 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -2197,31 +2197,40 @@ void hid_destroy_device(struct hid_device *hdev)
 EXPORT_SYMBOL_GPL(hid_destroy_device);
 
 
-static int __bus_add_driver(struct device_driver *drv, void *data)
+static int __hid_bus_reprobe_drivers(struct device *dev, void *data)
 {
-	struct hid_driver *added_hdrv = data;
-	struct hid_driver *hdrv = to_hid_driver(drv);
+	struct hid_driver *hdrv = data;
+	struct hid_device *hdev = to_hid_device(dev);
 
-	if (hdrv->bus_add_driver)
-		hdrv->bus_add_driver(added_hdrv);
+	if (hdev->driver == hdrv &&
+	    !hdrv->match(hdev, hid_ignore_special_drivers))
+		return device_reprobe(dev);
 
 	return 0;
 }
 
-static int __bus_removed_driver(struct device_driver *drv, void *data)
+static int __hid_bus_driver_added(struct device_driver *drv, void *data)
 {
-	struct hid_driver *removed_hdrv = data;
 	struct hid_driver *hdrv = to_hid_driver(drv);
 
-	if (hdrv->bus_removed_driver)
-		hdrv->bus_removed_driver(removed_hdrv);
+	if (hdrv->match) {
+		bus_for_each_dev(&hid_bus_type, NULL, hdrv,
+				 __hid_bus_reprobe_drivers);
+	}
 
 	return 0;
 }
 
+static int __bus_removed_driver(struct device_driver *drv, void *data)
+{
+	return bus_rescan_devices(&hid_bus_type);
+}
+
 int __hid_register_driver(struct hid_driver *hdrv, struct module *owner,
 		const char *mod_name)
 {
+	int ret;
+
 	hdrv->driver.name = hdrv->name;
 	hdrv->driver.bus = &hid_bus_type;
 	hdrv->driver.owner = owner;
@@ -2230,9 +2239,13 @@ int __hid_register_driver(struct hid_driver *hdrv, struct module *owner,
 	INIT_LIST_HEAD(&hdrv->dyn_list);
 	spin_lock_init(&hdrv->dyn_lock);
 
-	bus_for_each_drv(&hid_bus_type, NULL, hdrv, __bus_add_driver);
+	ret = driver_register(&hdrv->driver);
+
+	if (ret == 0)
+		bus_for_each_drv(&hid_bus_type, NULL, NULL,
+				 __hid_bus_driver_added);
 
-	return driver_register(&hdrv->driver);
+	return ret;
 }
 EXPORT_SYMBOL_GPL(__hid_register_driver);