From fc620b585707845331b1f545ddf5e2098023a77b Mon Sep 17 00:00:00 2001
From: Bo He <bo.he@intel.com>
Date: Mon, 14 Jan 2019 09:48:32 +0200
Subject: [PATCH] UPSTREAM: usb: dwc3: gadget: synchronize_irq dwc irq in
 suspend

We see dwc3 endpoint stopped by unwanted irq during
suspend resume test, which is caused dwc3 ep can't be started
with error "No Resource".

Here, add synchronize_irq before suspend to sync the
pending IRQ handlers complete.

Change-Id: I84b64e9fc760552fe831497a5889db0537e72667
Signed-off-by: Bo He <bo.he@intel.com>
Signed-off-by: Yu Wang <yu.y.wang@intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: William Wu <william.wu@rock-chips.com>
(cherry picked from commit 01c10880d24291a96a4ab0da773e3c5ce4d12da8)
---
 drivers/usb/dwc3/gadget.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 5348e3a8e07e..d9734debc6b4 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -3371,6 +3371,8 @@ int dwc3_gadget_suspend(struct dwc3 *dwc)
 	dwc3_disconnect_gadget(dwc);
 	__dwc3_gadget_stop(dwc);
 
+	synchronize_irq(dwc->irq_gadget);
+
 	return 0;
 }