Current implementation blocks the running operations when Plug-out and Plug-In is performed continuously, process gets stuck in dwc3_thread_interrupt().

Code Flow:

CPU1

->Gadget_start ->dwc3_interrupt ->dwc3_thread_interrupt ->dwc3_process_event_buf ->dwc3_process_event_entry ->dwc3_endpoint_interrupt ->dwc3_ep0_interrupt ->dwc3_ep0_inspect_setup ->dwc3_ep0_stall_and_restart

By this time if pending_list is not empty, it will get the next request on the given list and calls dwc3_gadget_giveback which will unmap request and call its complete() callback to notify upper layers that it has completed. Currently dwc3_gadget_giveback status is set to -ECONNRESET, whereas it should be -ESHUTDOWN based on condition if not dwc->connected is true.

Cc: stable@vger.kernel.org Fixes: d742220b3577 ("usb: dwc3: ep0: giveback requests on stall_and_restart") Signed-off-by: Uttkarsh Aggarwal quic_uaggarwa@quicinc.com ---

Changes in v2: Added dwc->connected check to set status either -ESHUTDOWN and -ECONNRESET in dwc3_gadget_giveback.

Link to v1: https://lore.kernel.org/all/20231122091127.3636-1-quic_uaggarwa@quicinc.com/...

drivers/usb/dwc3/ep0.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c index b94243237293..816b8eea73d6 100644 --- a/drivers/usb/dwc3/ep0.c +++ b/drivers/usb/dwc3/ep0.c @@ -238,7 +238,10 @@ void dwc3_ep0_stall_and_restart(struct dwc3 *dwc) struct dwc3_request *req;

req = next_request(&dep->pending_list); - dwc3_gadget_giveback(dep, req, -ECONNRESET); + if (!dwc->connected) + dwc3_gadget_giveback(dep, req, -ESHUTDOWN); + else + dwc3_gadget_giveback(dep, req, -ECONNRESET); }

dwc->eps[0]->trb_enqueue = 0;