From: Tomoya MORINAGA <tomoya.rohm@gmail.com>
Date: Thu, 12 Jan 2012 02:27:05 +0000 (+0900)
Subject: usb: gadget: pch_udc: Fix disconnect issue
X-Git-Tag: v3.3.3~14
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c643e97d48c1864bf48545bf322a682a5081c66e;p=thirdparty%2Fkernel%2Fstable.git

usb: gadget: pch_udc: Fix disconnect issue

commit c50a3bff0edb0acd49d8033a12ea4668e09a31ad upstream.

ISSUE:
When the driver notifies a gadget of a disconnect event, a system
rarely freezes.

CAUSE:
When the driver calls dev->driver->disconnect(), it is not calling
spin_unlock().

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 2d567ba473ea6..5070c2bd7271c 100644
--- a/drivers/usb/gadget/pch_udc.c
+++ b/drivers/usb/gadget/pch_udc.c
@@ -2336,8 +2336,11 @@ static void pch_udc_svc_ur_interrupt(struct pch_udc_dev *dev)
 		/* Complete request queue */
 		empty_req_queue(ep);
 	}
-	if (dev->driver && dev->driver->disconnect)
+	if (dev->driver && dev->driver->disconnect) {
+		spin_unlock(&dev->lock);
 		dev->driver->disconnect(&dev->gadget);
+		spin_lock(&dev->lock);
+	}
 }
 
 /**