linux-kernel - [PATCH 2/5] usb: dwc3: gadget: Force sending delayed status during soft disconnect

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Date:   Fri, 8 Jul 2022 11:50:04 -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>,
        <Thinh.Nguyen@...opsys.com>, <quic_jackp@...cinc.com>,
        Wesley Cheng <quic_wcheng@...cinc.com>
Subject: [PATCH 2/5] usb: dwc3: gadget: Force sending delayed status during soft disconnect

If any function drivers request for a delayed status phase, this leads to a
SETUP transfer timeout error, since the function may take longer to process
the DATA stage.  This eventually results in end transfer timeouts, as there
is a pending SETUP transaction.

Signed-off-by: Wesley Cheng <quic_wcheng@...cinc.com>
---
 drivers/usb/dwc3/gadget.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 298e842c384c..75cbc3f185d0 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2513,6 +2513,9 @@ static int dwc3_gadget_soft_disconnect(struct dwc3 *dwc)
 	if (dwc->ep0state != EP0_SETUP_PHASE) {
 		int ret;
 
+		if (dwc->delayed_status)
+			dwc3_ep0_send_delayed_status(dwc);
+
 		reinit_completion(&dwc->ep0_in_setup);
 
 		spin_unlock_irqrestore(&dwc->lock, flags);