linux-kernel - [RFC] usb: dwc: ep0: Use -ESHUTDOWN in dwc3_ep0_stall

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Date:   Wed, 22 Nov 2023 14:41:27 +0530
From:   Uttkarsh Aggarwal <quic_uaggarwa@...cinc.com>
To:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        "Uttkarsh Aggarwal" <quic_uaggarwa@...cinc.com>,
        <stable@...r.kernel.org>
Subject: [RFC] usb: dwc: ep0: Use -ESHUTDOWN in dwc3_ep0_stall_restart

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@...r.kernel.org>
Fixes: d742220b3577 ("usb: dwc3: ep0: giveback requests on stall_and_restart")
Signed-off-by: Uttkarsh Aggarwal <quic_uaggarwa@...cinc.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);
 	}
 
 	dwc->eps[0]->trb_enqueue = 0;
-- 
2.17.1