linux-kernel - [PATCH 3/6 v2] usb/gadget/pch

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Date:	Thu, 12 Jan 2012 11:27:07 +0900
From:	Tomoya MORINAGA <tomoya.rohm@...il.com>
To:	Felipe Balbi <balbi@...com>, Greg Kroah-Hartman <gregkh@...e.de>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	qi.wang@...el.com, yong.y.wang@...el.com, joel.clark@...el.com,
	kok.howg.ewe@...el.com, Tomoya MORINAGA <tomoya.rohm@...il.com>
Subject: [PATCH 3/6 v2] usb/gadget/pch_udc: Fix USB suspend issue

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@...il.com>
---
V2: Divide into 6 patches
---
 drivers/usb/gadget/pch_udc.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/drivers/usb/gadget/pch_udc.c b/drivers/usb/gadget/pch_udc.c
index 78a2fce..6cd9e21 100644
--- a/drivers/usb/gadget/pch_udc.c
+++ b/drivers/usb/gadget/pch_udc.c
@@ -2480,8 +2480,15 @@ 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");
-- 
1.7.4.4

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