linux-kernel - [PATCH v3 8/8] usb: dwc3: gadget: Submit endxfer command if delayed during disconnect

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Date:   Mon, 15 Aug 2022 14:31:34 -0700
From:   Wesley Cheng <quic_wcheng@...cinc.com>
To:     <balbi@...nel.org>, <gregkh@...uxfoundation.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <quic_jackp@...cinc.com>, <Thinh.Nguyen@...opsys.com>,
        Wesley Cheng <quic_wcheng@...cinc.com>
Subject: [PATCH v3 8/8] usb: dwc3: gadget: Submit endxfer command if delayed during disconnect

During a cable disconnect sequence, if ep0state is not in the SETUP phase,
then nothing will trigger any pending end transfer commands.  Force
stopping of any pending SETUP transaction, and move back to the SETUP
phase.

Signed-off-by: Wesley Cheng <quic_wcheng@...cinc.com>
---
 drivers/usb/dwc3/gadget.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 5e8d3f02f99c..757ecb04b55a 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -3776,13 +3776,24 @@ static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
 	reg &= ~DWC3_DCTL_INITU2ENA;
 	dwc3_gadget_dctl_write_safe(dwc, reg);
 
+	dwc->connected = false;
+
 	dwc3_disconnect_gadget(dwc);
 
 	dwc->gadget->speed = USB_SPEED_UNKNOWN;
 	dwc->setup_packet_pending = false;
 	usb_gadget_set_state(dwc->gadget, USB_STATE_NOTATTACHED);
 
-	dwc->connected = false;
+	if (dwc->ep0state != EP0_SETUP_PHASE) {
+		unsigned int    dir;
+
+		dir = !!dwc->ep0_expect_in;
+		if (dwc->ep0state == EP0_DATA_PHASE)
+			dwc3_ep0_end_control_data(dwc, dwc->eps[dir]);
+		else
+			dwc3_ep0_end_control_data(dwc, dwc->eps[!dir]);
+		dwc3_ep0_stall_and_restart(dwc);
+	}
 }
 
 static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)