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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Guido Kiener <guido@kiener-muenchen.de>,
        Guido Kiener <guido.kiener@rohde-schwarz.com>,
        Felipe Balbi <felipe.balbi@linux.intel.com>,
        Sasha Levin <sashal@kernel.org>, linux-usb@vger.kernel.org
Subject: [PATCH AUTOSEL 5.0 32/98] usb: gadget: net2280: Fix net2280_dequeue()
Date:   Mon, 22 Apr 2019 15:40:59 -0400
Message-Id: <20190422194205.10404-32-sashal@kernel.org>
In-Reply-To: <20190422194205.10404-1-sashal@kernel.org>
References: <20190422194205.10404-1-sashal@kernel.org>
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From: Guido Kiener <guido@kiener-muenchen.de>

[ Upstream commit f1d3fba17cd4eeea20397f1324b7b9c69a6a935c ]

When a request must be dequeued with net2280_dequeue() e.g. due
to a device clear action and the same request is finished by the
function scan_dma_completions() then the function net2280_dequeue()
does not find the request in the following search loop and
returns the error -EINVAL without restoring the status ep->stopped.
Thus the endpoint keeps blocked and does not receive any data
anymore.
This fix restores the status and does not issue an error message.

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Guido Kiener <guido.kiener@rohde-schwarz.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Sasha Levin (Microsoft) <sashal@kernel.org>
---
 drivers/usb/gadget/udc/net2280.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/udc/net2280.c b/drivers/usb/gadget/udc/net2280.c
index dc6f5a78d124..d93cf4171953 100644
--- a/drivers/usb/gadget/udc/net2280.c
+++ b/drivers/usb/gadget/udc/net2280.c
@@ -1273,9 +1273,9 @@ static int net2280_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 			break;
 	}
 	if (&req->req != _req) {
+		ep->stopped = stopped;
 		spin_unlock_irqrestore(&ep->dev->lock, flags);
-		dev_err(&ep->dev->pdev->dev, "%s: Request mismatch\n",
-								__func__);
+		ep_dbg(ep->dev, "%s: Request mismatch\n", __func__);
 		return -EINVAL;
 	}
 
-- 
2.19.1