From: Tomoya MORINAGA <tomoya.rohm@gmail.com>
Date: Thu, 12 Jan 2012 02:27:07 +0000 (+0900)
Subject: usb: gadget: pch_udc: Fix USB suspend issue
X-Git-Tag: v3.3.3~12
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=aa95f7fa2e6124553ad3d720d30682e4d12f4feb;p=thirdparty%2Fkernel%2Fstable.git

usb: gadget: pch_udc: Fix USB suspend issue

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>
---

diff --git a/drivers/usb/gadget/pch_udc.c b/drivers/usb/gadget/pch_udc.c
index 62cc6ab90fd40..db4b322e54196 100644
--- a/drivers/usb/gadget/pch_udc.c
+++ b/drivers/usb/gadget/pch_udc.c
@@ -2476,8 +2476,15 @@ static void pch_udc_dev_isr(struct pch_udc_dev *dev, u32 dev_intr)
 	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");