linux-kernel - [PATCH 3.10 108/173] iio:accel:kxsd9 fix missing mutex unlock

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Date:	Mon,  2 Dec 2013 11:11:31 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Frank Zago <frank@...o.net>,
	Jonathan Cameron <jic23@...nel.org>
Subject: [PATCH 3.10 108/173] iio:accel:kxsd9 fix missing mutex unlock

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

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

From: Frank Zago <frank@...o.net>

commit 0ee005c7dc2803125275e24598f0fb37775a6af3 upstream.

This will leave a lock held after reading from the device, preventing
any further reads.

Signed-off-by: Frank Zago <frank@...o.net>
Signed-off-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iio/accel/kxsd9.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/drivers/iio/accel/kxsd9.c
+++ b/drivers/iio/accel/kxsd9.c
@@ -112,9 +112,10 @@ static int kxsd9_read(struct iio_dev *in
 	mutex_lock(&st->buf_lock);
 	st->tx[0] = KXSD9_READ(address);
 	ret = spi_sync_transfer(st->us, xfers, ARRAY_SIZE(xfers));
-	if (ret)
-		return ret;
-	return (((u16)(st->rx[0])) << 8) | (st->rx[1] & 0xF0);
+	if (!ret)
+		ret = (((u16)(st->rx[0])) << 8) | (st->rx[1] & 0xF0);
+	mutex_unlock(&st->buf_lock);
+	return ret;
 }
 
 static IIO_CONST_ATTR(accel_scale_available,


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