linux-kernel - [PATCH 4.14 017/217] usb: dwc2: gadget: Fix issue in dwc2_gadget_start

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Message-Id: <20180823075506.324797707@linuxfoundation.org>
Date:   Thu, 23 Aug 2018 09:52:10 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Zeng Tao <prime.zeng@...ilicon.com>,
        Minas Harutyunyan <hminas@...opsys.com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 017/217] usb: dwc2: gadget: Fix issue in dwc2_gadget_start_isoc()

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>

[ Upstream commit 1ffba9058737af2ddeebc813faa8ea9b16bc892a ]

In case of requests queue is empty reset EP target_frame to
initial value.

This allow restarting ISOC traffic in case when function
driver queued requests with interruptions.

Tested-by: Zeng Tao <prime.zeng@...ilicon.com>
Signed-off-by: Minas Harutyunyan <hminas@...opsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/dwc2/gadget.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -932,6 +932,7 @@ static void dwc2_gadget_start_isoc_ddma(
 	u32 ctrl;
 
 	if (list_empty(&hs_ep->queue)) {
+		hs_ep->target_frame = TARGET_FRAME_INITIAL;
 		dev_dbg(hsotg->dev, "%s: No requests in queue\n", __func__);
 		return;
 	}