linux-kernel - [PATCH] usb: dwc3: gadget: Avoid canceling current request for queuing error

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Date:   Wed, 14 Apr 2021 15:29:48 -0700
From:   Wesley Cheng <wcheng@...eaurora.org>
To:     balbi@...nel.org, gregkh@...uxfoundation.org
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        jackp@...eaurora.org, Wesley Cheng <wcheng@...eaurora.org>
Subject: [PATCH] usb: dwc3: gadget: Avoid canceling current request for queuing error

If an error is received when issuing a start or update transfer
command, the error handler will stop all active requests (including
the current USB request), and call dwc3_gadget_giveback() to notify
function drivers of the requests which have been stopped.  Avoid
having to cancel the current request which is trying to be queued, as
the function driver will handle the EP queue error accordingly.
Simply unmap the request as it was done before, and allow previously
started transfers to be cleaned up.

Signed-off-by: Wesley Cheng <wcheng@...eaurora.org>
---
 drivers/usb/dwc3/gadget.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index e1b04c97..4200775 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1399,6 +1399,11 @@ static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep)
 		if (ret == -EAGAIN)
 			return ret;
 
+		/* Avoid canceling current request, as it has not been started */
+		if (req->trb)
+			memset(req->trb, 0, sizeof(struct dwc3_trb));
+		dwc3_gadget_del_and_unmap_request(dep, req, ret);
+
 		dwc3_stop_active_transfer(dep, true, true);
 
 		list_for_each_entry_safe(req, tmp, &dep->started_list, list)
-- 
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