On Wed, Nov 22, 2023, Uttkarsh Aggarwal wrote:

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.

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

---

drivers/usb/dwc3/ep0.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c index b94243237293..8317fedda1c0 100644 --- a/drivers/usb/dwc3/ep0.c +++ b/drivers/usb/dwc3/ep0.c @@ -238,7 +238,7 @@ 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);
  

• dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
  

There are other conditions which should return -ECONNRESET (e.g. invalid length, direction, got cancelled). For the particular condition that you want for -ESHUTDOWN, I think you can use the dwc->connected field to check for that.

BR, Thinh

} dwc->eps[0]->trb_enqueue = 0; -- 2.17.1