[PATCH 4.19 120/148] usb: dwc: ep0: Update request status in dwc3_ep0_stall_restart

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4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Uttkarsh Aggarwal <quic_uaggarwa@xxxxxxxxxxx>

commit e9d40b215e38480fd94c66b06d79045717a59e9c upstream.

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@xxxxxxxxxxxxxxx>
Fixes: d742220b3577 ("usb: dwc3: ep0: giveback requests on stall_and_restart")
Signed-off-by: Uttkarsh Aggarwal <quic_uaggarwa@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20231222094704.20276-1-quic_uaggarwa@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/usb/dwc3/ep0.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -236,7 +236,10 @@ static void dwc3_ep0_stall_and_restart(s
 		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->ep0state = EP0_SETUP_PHASE;






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