linux-kernel - [PATCH] usb: dwc3: gadget: don't remove the request if bus-expired

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Message-ID: <1545339230-10520-1-git-send-email-prime.zeng@hisilicon.com>
Date:   Fri, 21 Dec 2018 04:53:50 +0800
From:   Zeng Tao <prime.zeng@...ilicon.com>
To:     <felipe.balbi@...ux.intel.com>
CC:     Zeng Tao <prime.zeng@...ilicon.com>,
        Felipe Balbi <balbi@...nel.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] usb: dwc3: gadget: don't remove the request if bus-expired

We have already returned EAGAIN for bus-expiry, and it's designed to
start with a future Frame number and start the transfer again. So we
should not remove the request for that case.

Signed-off-by: Zeng Tao <prime.zeng@...ilicon.com>
---
 drivers/usb/dwc3/gadget.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 2ecde30..16a6e3c 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1250,7 +1250,7 @@ static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep)
 	}
 
 	ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
-	if (ret < 0) {
+	if (ret < 0 && ret != -EAGAIN) {
 		/*
 		 * FIXME we need to iterate over the list of requests
 		 * here and stop, unmap, free and del each of the linked
@@ -1259,10 +1259,9 @@ static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep)
 		if (req->trb)
 			memset(req->trb, 0, sizeof(struct dwc3_trb));
 		dwc3_gadget_del_and_unmap_request(dep, req, ret);
-		return ret;
 	}
 
-	return 0;
+	return ret;
 }
 
 static int __dwc3_gadget_get_frame(struct dwc3 *dwc)
-- 
2.7.4