From: Jiebing Li <jiebing.li@intel.com>
Date: Thu, 11 Dec 2014 05:26:29 +0000 (+0800)
Subject: UPSTREAM: usb: dwc3: gadget: release spin lock during gadget resume
X-Git-Tag: firefly_0821_release~1884
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=1baa189ddb5a0cf51e28ab6d22beef47663bc942;p=firefly-linux-kernel-4.4.55.git

UPSTREAM: usb: dwc3: gadget: release spin lock during gadget resume

It's a requirement that we release controller's lock
while calling gadget API function pointers. This
patch just fixes that long standing bug.

Change-Id: I19c2cd36fa48a6c27d59305ef2d6cb4c35512433
Signed-off-by: Jiebing Li <jiebing.li@intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Wu Liang feng <wulf@rock-chips.com>
(cherry picked from commit ad14d4e0308afda06a60036020a15025571604af)
---

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 2d981e1b869c..f6d90fb121d9 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2484,7 +2484,11 @@ static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
 	 * implemented.
 	 */
 
-	dwc->gadget_driver->resume(&dwc->gadget);
+	if (dwc->gadget_driver && dwc->gadget_driver->resume) {
+		spin_unlock(&dwc->lock);
+		dwc->gadget_driver->resume(&dwc->gadget);
+		spin_lock(&dwc->lock);
+	}
 }
 
 static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,