linux-kernel - [PATCH v4 9/9] usb: dwc3: gadget: Submit endxfer command if delayed during disconnect

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Message-ID: <20220817182359.13550-10-quic_wcheng@quicinc.com>
Date:   Wed, 17 Aug 2022 11:23:59 -0700
From:   Wesley Cheng <quic_wcheng@...cinc.com>
To:     <balbi@...nel.org>, <gregkh@...uxfoundation.org>,
        <Thinh.Nguyen@...opsys.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <quic_jackp@...cinc.com>, Wesley Cheng <quic_wcheng@...cinc.com>
Subject: [PATCH v4 9/9] 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.

Reviewed-by: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
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 4f862552fe00..07d57542ad01 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)