[PATCH] fsl/fman: Fix clk reference leak in read_dts_node()

[Wentao Liang <vulab@iscas.ac.cn>]

of_clk_get() returns a clock with its reference count incremented, but
read_dts_node() only uses it to read the rate and never calls clk_put().
The clock is not stored anywhere, so the reference cannot be released
later either.

Release the clock once its rate has been read, which also covers the
error path taken when the rate is zero.

Fixes: 414fd46e7762 ("fsl/fman: Add FMan support")
Cc: stable@vger.kernel.org
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
---
 drivers/net/ethernet/freescale/fman/fman.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/freescale/fman/fman.c b/drivers/net/ethernet/freescale/fman/fman.c
index 013273a2de32..0f342b1a845b 100644
--- a/drivers/net/ethernet/freescale/fman/fman.c
+++ b/drivers/net/ethernet/freescale/fman/fman.c
@@ -2732,6 +2732,7 @@ static struct fman *read_dts_node(struct platform_device *of_dev)
 	}
 
 	clk_rate = clk_get_rate(clk);
+	clk_put(clk);
 	if (!clk_rate) {
 		err = -EINVAL;
 		dev_err(&of_dev->dev, "%s: Failed to determine FM%d clock rate\n",
-- 
2.34.1