linux-kernel - [PATCH 1/6 v2] usb/gadget/pch

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Date:	Thu, 12 Jan 2012 11:27:05 +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 1/6 v2] usb/gadget/pch_udc: Fix disconnect issue

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 spinlock().

Signed-off-by: Tomoya MORINAGA <tomoya.rohm@...il.com>
---
V2: Divide into 6 patches
---
 drivers/usb/gadget/pch_udc.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/usb/gadget/pch_udc.c b/drivers/usb/gadget/pch_udc.c
index f222659..a4f8b08 100644
--- a/drivers/usb/gadget/pch_udc.c
+++ b/drivers/usb/gadget/pch_udc.c
@@ -2340,8 +2340,11 @@ 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);
+	}
 }
 
 /**
-- 
1.7.4.4

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