[PATCH 2/2] Bluetooth: btusb: mediatek: Fix leaked runtime PM reference in reset

[Jiajia Liu]

MT7925 on HP Pro Mini 260 sometimes timed out during reloading driver
and reset usb device. btusb_suspend is not called again after closing
bluetooth interface.

 usbcore: registered new interface driver btusb
 Bluetooth: hci0: HW/SW Version: 0x00000000, Build Time: 20260605184935
 Bluetooth: hci0: Execution of wmt command timed out
 Bluetooth: hci0: Failed to send wmt patch dwnld (-110)
 Bluetooth: hci0: Failed to set up firmware (-110)
 usb 3-10: reset high-speed USB device number 4 using xhci_hcd
 Bluetooth: hci0: HW/SW Version: 0x00000000, Build Time: 20260605184935
 Bluetooth: hci0: Device setup in 1856545 usecs
 Bluetooth: hci0: AOSP extensions version v1.00
 Bluetooth: hci0: AOSP quality report is supported
 Bluetooth: MGMT ver 1.23

btusb_mtk_reset() calls usb_autopm_get_interface() to resume the
device before driving the hardware reset, but never calls the matching
usb_autopm_put_interface(). Every hardware reset therefore leaks a PM
usage reference of the interface, preventing the device from being
runtime suspended again until it is unbound.

Add the missing usb_autopm_put_interface() at the end of the function.
The reset_gpio path is left untouched on purpose: there the device
yanks itself off the USB and replugs, so the interface is destroyed
and its PM state goes away with it.

Fixes: 25b6d7593a3a ("Bluetooth: btmtk: introduce btmtk reset work")
Assisted-by: Claude:qwen3.8-max
Signed-off-by: Jiajia Liu <liujiajia at kylinos.cn>
---
 drivers/bluetooth/btusb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index cc19828893c6..c3cc70ca28dc 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -2945,6 +2945,7 @@ static int btusb_mtk_reset(struct hci_dev *hdev, void *rst_data)
 
 	usb_queue_reset_device(data->intf);
 	clear_bit(BTMTK_HW_RESET_ACTIVE, &btmtk_data->flags);
+	usb_autopm_put_interface(data->intf);
 
 	return err;
 }
-- 
2.55.0