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>

3 files changed, 24 insertions, 48 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);
 
diff --git a/drivers/hid/hid-generic.c b/drivers/hid/hid-generic.c
index 3c0a1bf433d7..c25b4718de44 100644
--- a/drivers/hid/hid-generic.c
+++ b/drivers/hid/hid-generic.c
@@ -26,37 +26,6 @@
 
 static struct hid_driver hid_generic;
 
-static int __unmap_hid_generic(struct device *dev, void *data)
-{
-        struct hid_driver *hdrv = data;
-        struct hid_device *hdev = to_hid_device(dev);
-
-        /* only unbind matching devices already bound to hid-generic */
-        if (hdev->driver != &hid_generic ||
-            hid_match_device(hdev, hdrv) == NULL)
-                return 0;
-
-        if (dev->parent)        /* Needed for USB */
-                device_lock(dev->parent);
-        device_release_driver(dev);
-        if (dev->parent)
-                device_unlock(dev->parent);
-
-        return 0;
-}
-
-static void hid_generic_add_driver(struct hid_driver *hdrv)
-{
-        bus_for_each_dev(&hid_bus_type, NULL, hdrv, __unmap_hid_generic);
-}
-
-static void hid_generic_removed_driver(struct hid_driver *hdrv)
-{
-        int ret;
-
-        ret = driver_attach(&hid_generic.driver);
-}
-
 static int __check_hid_generic(struct device_driver *drv, void *data)
 {
         struct hid_driver *hdrv = to_hid_driver(drv);
@@ -97,8 +66,6 @@ static struct hid_driver hid_generic = {
         .name = "hid-generic",
         .id_table = hid_table,
         .match = hid_generic_match,
-        .bus_add_driver = hid_generic_add_driver,
-        .bus_removed_driver = hid_generic_removed_driver,
 };
 module_hid_driver(hid_generic);
 
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 091a81cf330f..a62ee4a609ac 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -686,8 +686,6 @@ struct hid_usage_id {
  * @input_mapped: invoked on input registering after mapping an usage
  * @input_configured: invoked just before the device is registered
  * @feature_mapping: invoked on feature registering
- * @bus_add_driver: invoked when a HID driver is about to be added
- * @bus_removed_driver: invoked when a HID driver has been removed
  * @suspend: invoked on suspend (NULL means nop)
  * @resume: invoked on resume if device was not reset (NULL means nop)
  * @reset_resume: invoked on resume if device was reset (NULL means nop)
@@ -742,8 +740,6 @@ struct hid_driver {
         void (*feature_mapping)(struct hid_device *hdev,
                         struct hid_field *field,
                         struct hid_usage *usage);
-        void (*bus_add_driver)(struct hid_driver *driver);
-        void (*bus_removed_driver)(struct hid_driver *driver);
 #ifdef CONFIG_PM
         int (*suspend)(struct hid_device *hdev, pm_message_t message);
         int (*resume)(struct hid_device *hdev);