[PATCH 4.4 020/131] usb: dwc3: gadget: Fix suspend/resume during device mode

[Greg Kroah-Hartman]

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

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

From: Roger Quadros <rogerq@xxxxxx>

commit 9772b47a4c2916d645c551228b6085ea24acbe5d upstream.

Gadget controller might not be always active during system
suspend/resume as gadget driver might not have yet been loaded or
might have been unloaded prior to system suspend.

Check if we're active and only then perform
necessary actions during suspend/resume.

Signed-off-by: Roger Quadros <rogerq@xxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/usb/dwc3/gadget.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2894,6 +2894,9 @@ void dwc3_gadget_exit(struct dwc3 *dwc)
 
 int dwc3_gadget_suspend(struct dwc3 *dwc)
 {
+	if (!dwc->gadget_driver)
+		return 0;
+
 	if (dwc->pullups_connected) {
 		dwc3_gadget_disable_irq(dwc);
 		dwc3_gadget_run_stop(dwc, true, true);
@@ -2912,6 +2915,9 @@ int dwc3_gadget_resume(struct dwc3 *dwc)
 	struct dwc3_ep		*dep;
 	int			ret;
 
+	if (!dwc->gadget_driver)
+		return 0;
+
 	/* Start with SuperSpeed Default */
 	dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);