usb: dwc3: debugfs: Add and remove endpoint dirs dynamically
The DWC3 DebugFS directory and files are currently created once during probe. This includes creation of subdirectories for each of the gadget's endpoints. This works fine for peripheral-only controllers, as dwc3_core_init_mode() calls dwc3_gadget_init() just prior to calling dwc3_debugfs_init(). However, for dual-role controllers, dwc3_core_init_mode() will instead call dwc3_drd_init() which is problematic in a few ways. First, the initial state must be determined, then dwc3_set_mode() will have to schedule drd_work and by then dwc3_debugfs_init() could have already been invoked. Even if the initial mode is peripheral, dwc3_gadget_init() happens after the DebugFS files are created, and worse so if the initial state is host and the controller switches to peripheral much later. And secondly, even if the gadget endpoints' debug entries were successfully created, if the controller exits peripheral mode, its dwc3_eps are freed so the debug files would now hold stale references. So it is best if the DebugFS endpoint entries are created and removed dynamically at the same time the underlying dwc3_eps are. Do this by calling dwc3_debugfs_create_endpoint_dir() as each endpoint is created, and conversely remove the DebugFS entry when the endpoint is freed. Fixes: 41ce1456 ("usb: dwc3: core: make dwc3_set_mode() work properly") Cc: stable <stable@vger.kernel.org> Reviewed-by:Peter Chen <peter.chen@kernel.org> Signed-off-by: