linux-kernel - [PATCH 1/2] USB: gadget: s3c-hsotg: fix spinlock locking

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Date:	Thu, 21 Nov 2013 13:49:17 +0100
From:	Robert Baldyga <r.baldyga@...sung.com>
To:	balbi@...com
Cc:	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, b.zolnierkie@...sung.com,
	m.szyprowski@...sung.com, andrzej.p@...sung.com,
	Robert Baldyga <r.baldyga@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: [PATCH 1/2] USB: gadget: s3c-hsotg: fix spinlock locking

This patch adds missing spinlock locking in s3c_hsotg_complete_setup function,
and unlocking for gadget setup call.

Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
---
 drivers/usb/gadget/s3c-hsotg.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c
index 0646587..f709b13 100644
--- a/drivers/usb/gadget/s3c-hsotg.c
+++ b/drivers/usb/gadget/s3c-hsotg.c
@@ -1245,7 +1245,9 @@ static void s3c_hsotg_process_control(struct s3c_hsotg *hsotg,
 	/* as a fallback, try delivering it to the driver to deal with */
 
 	if (ret == 0 && hsotg->driver) {
+		spin_unlock(&hsotg->lock);
 		ret = hsotg->driver->setup(&hsotg->gadget, ctrl);
+		spin_lock(&hsotg->lock);
 		if (ret < 0)
 			dev_dbg(hsotg->dev, "driver->setup() ret %d\n", ret);
 	}
@@ -1308,10 +1310,12 @@ static void s3c_hsotg_complete_setup(struct usb_ep *ep,
 		return;
 	}
 
+	spin_lock(&hsotg->lock);
 	if (req->actual == 0)
 		s3c_hsotg_enqueue_setup(hsotg);
 	else
 		s3c_hsotg_process_control(hsotg, req->buf);
+	spin_unlock(&hsotg->lock);
 }
 
 /**
-- 
1.7.9.5

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