Commit 58577118 authored by Kuen-Han Tsai's avatar Kuen-Han Tsai Committed by Greg Kroah-Hartman
Browse files

usb: dwc3: Ignore late xferNotReady event to prevent halt timeout 



During a device-initiated disconnect, the End Transfer command resets
the event filter, allowing a new xferNotReady event to be generated
before the controller is fully halted. Processing this late event
incorrectly triggers a Start Transfer, which prevents the controller
from halting and results in a DSTS.DEVCTLHLT bit polling timeout.

Ignore the late xferNotReady event if the controller is already in a
disconnected state.

Fixes: 72246da4 ("usb: Introduce DesignWare USB3 DRD Driver")
Cc: stable <stable@kernel.org>
Signed-off-by: default avatarKuen-Han Tsai <khtsai@google.com>
Acked-by: default avatarThinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20250807090700.2397190-1-khtsai@google.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6ca8af3c

drivers/usb/dwc3/gadget.c

+9 −0
Original line number Diff line number Diff line
@@ -3777,6 +3777,15 @@ static void dwc3_gadget_endpoint_transfer_complete(struct dwc3_ep *dep, 
static void dwc3_gadget_endpoint_transfer_not_ready(struct dwc3_ep *dep,

		const struct dwc3_event_depevt *event)

{

	/*

	 * During a device-initiated disconnect, a late xferNotReady event can

	 * be generated after the End Transfer command resets the event filter,

	 * but before the controller is halted. Ignore it to prevent a new

	 * transfer from starting.

	 */

	if (!dep->dwc->connected)

		return;



	dwc3_gadget_endpoint_frame_from_event(dep, event);



	/*