btusb_reset calls usb_autopm_get_interface to resume the device
before queuing a reset of it, but never calls the matching
usb_autopm_put_interface.
usb_queue_reset_device ends up in usb_reset_device(), and since
btusb provides no pre_reset/post_reset callbacks the interface is
merely unbound and rebound: the interface device object survives
this cycle, and so does its PM usage count, which is not cleared
when the driver is unbound.
As a result every reset permanently leaks a PM usage reference,
preventing the interface from being runtime suspended again until
it is unbound.
Set BTUSB_RESET flag before usb_queue_reset_device so that
btusb_disconnect drops the reference. If the flag is already set,
drop one reference.
Fixes: c9209b269a ("Bluetooth: btusb: Introduce generic USB reset")
Assisted-by: Claude:qwen3.8-max
Signed-off-by: Jiajia Liu <liujiajia@kylinos.cn>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Jiajia Liu
c93922dd31