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

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commit 58577118cc upstream.

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: 72246da40f ("usb: Introduce DesignWare USB3 DRD Driver")
Cc: stable <stable@kernel.org>
Signed-off-by: Kuen-Han Tsai <khtsai@google.com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20250807090700.2397190-1-khtsai@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kuen-Han Tsai 2025-08-07 17:06:55 +08:00 committed by Greg Kroah-Hartman
parent dbfaa79103
commit 319aba29a4
1 changed files with 9 additions and 0 deletions
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9
drivers/usb/dwc3/gadget.c
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@ -3735,6 +3735,15 @@ 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);
/*