[PATCH 4.17 021/324] usb: dwc2: gadget: Fix issue in dwc2_gadget_start_isoc()

[Greg Kroah-Hartman]

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

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

From: Minas Harutyunyan <Minas.Harutyunyan@xxxxxxxxxxxx>

[ 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@xxxxxxxxxxxxx>
Signed-off-by: Minas Harutyunyan <hminas@xxxxxxxxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/usb/dwc2/gadget.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -892,6 +892,7 @@ 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;
 	}