linux-kernel - [ 62/75] usb: gadget: pch

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Message-Id: <20120419210308.399592885@linuxfoundation.org>
Date:	Thu, 19 Apr 2012 14:04:05 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Tomoya MORINAGA <tomoya.rohm@...il.com>,
	Felipe Balbi <balbi@...com>
Subject: [ 62/75] usb: gadget: pch_udc: Fix disconnect issue

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

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

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

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@...il.com>
Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/gadget/pch_udc.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- 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(str
 		/* 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);
+	}
 }
 
 /**


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