From: Mark Gross <mgross@linux.intel.com>

The code path through skel_open can grap the driver's io_mutex lock and
forget to release it.

Signed-off-by: Mark Gross <mgross@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/usb/usb-skeleton.c |    1 +
 1 files changed, 1 insertion(+)

diff -puN drivers/usb/usb-skeleton.c~usb-skeleton-leaking-locks-on-open drivers/usb/usb-skeleton.c
--- a/drivers/usb/usb-skeleton.c~usb-skeleton-leaking-locks-on-open
+++ a/drivers/usb/usb-skeleton.c
@@ -125,6 +125,7 @@ static int skel_open(struct inode *inode
 
 	/* save our object in the file's private structure */
 	file->private_data = dev;
+	mutex_unlock(&dev->io_mutex);
 
 exit:
 	return retval;
_