[ 52/68] usb: gadget: pch_udc: Fix USB suspend issue

[Greg KH <gregkh@linuxfoundation.org>]

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

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

From: Tomoya MORINAGA <tomoya.rohm@gmail.com>

commit 84566abba058b2aae8d603dfa90b5a3778a6714f upstream.

ISSUE:
After USB Suspend, a system rarely freezes.

CAUSE:
When USB Suspend occurred, the driver is not notifying
a gadget of the event.

Signed-off-by: Tomoya MORINAGA <tomoya.rohm@gmail.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/gadget/pch_udc.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

--- a/drivers/usb/gadget/pch_udc.c
+++ b/drivers/usb/gadget/pch_udc.c
@@ -2475,8 +2475,15 @@ static void pch_udc_dev_isr(struct pch_u
 	if (dev_intr & UDC_DEVINT_SC)
 		pch_udc_svc_cfg_interrupt(dev);
 	/* USB Suspend interrupt */
-	if (dev_intr & UDC_DEVINT_US)
+	if (dev_intr & UDC_DEVINT_US) {
+		if (dev->driver
+			&& dev->driver->suspend) {
+			spin_unlock(&dev->lock);
+			dev->driver->suspend(&dev->gadget);
+			spin_lock(&dev->lock);
+		}
 		dev_dbg(&dev->pdev->dev, "USB_SUSPEND\n");
+	}
 	/* Clear the SOF interrupt, if enabled */
 	if (dev_intr & UDC_DEVINT_SOF)
 		dev_dbg(&dev->pdev->dev, "SOF\n");