HID: wiimote: use unique battery names

Battery device names must be unique, otherwise registration fails if
multiple Wii Remotes are connected.

This breaks the sysfs API, but there is no known application that uses the
Wii Remote battery that I know of so we should go ahead and apply this.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/hid/hid-wiimote-core.c b/drivers/hid/hid-wiimote-core.c
index 0fb8ab93db68..f1c7a113b614 100644
--- a/drivers/hid/hid-wiimote-core.c
+++ b/drivers/hid/hid-wiimote-core.c
@@ -1160,6 +1160,7 @@ static void wiimote_destroy(struct wiimote_data *wdata)
         wiimote_leds_destroy(wdata);
 
         power_supply_unregister(&wdata->battery);
+        kfree(wdata->battery.name);
         input_unregister_device(wdata->accel);
         input_unregister_device(wdata->ir);
         input_unregister_device(wdata->input);
@@ -1216,9 +1217,14 @@ static int wiimote_hid_probe(struct hid_device *hdev,
         wdata->battery.properties = wiimote_battery_props;
         wdata->battery.num_properties = ARRAY_SIZE(wiimote_battery_props);
         wdata->battery.get_property = wiimote_battery_get_property;
-        wdata->battery.name = "wiimote_battery";
         wdata->battery.type = POWER_SUPPLY_TYPE_BATTERY;
         wdata->battery.use_for_apm = 0;
+        wdata->battery.name = kasprintf(GFP_KERNEL, "wiimote_battery_%s",
+                                        wdata->hdev->uniq);
+        if (!wdata->battery.name) {
+                ret = -ENOMEM;
+                goto err_battery_name;
+        }
 
         ret = power_supply_register(&wdata->hdev->dev, &wdata->battery);
         if (ret) {
@@ -1254,6 +1260,8 @@ err_free:
         return ret;
 
 err_battery:
+        kfree(wdata->battery.name);
+err_battery_name:
         input_unregister_device(wdata->input);
         wdata->input = NULL;
 err_input: