[PATCH] clk: imx: Fix clock reference leak in imx_get_clk_hw_by_name()

[Wentao Liang]

imx_get_clk_hw_by_name() obtains a consumer clock with
of_clk_get_by_name(), extracts the hardware pointer with __clk_get_hw()
and returns it without ever calling clk_put(), leaking the consumer
reference on both return paths.

Extract the hardware pointer first and drop the clock reference with
clk_put() before returning.

Fixes: 3b315214e091 ("clk: imx: implement new clk_hw based APIs")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Wentao Liang <vulab@xxxxxxxxxxx>
---
 drivers/clk/imx/clk.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/imx/clk.c b/drivers/clk/imx/clk.c
index f38506830ccf..e113e30514fa 100644
--- a/drivers/clk/imx/clk.c
+++ b/drivers/clk/imx/clk.c
@@ -119,12 +119,16 @@ struct clk_hw *imx_obtain_fixed_of_clock(struct device_node *np,
 struct clk_hw *imx_get_clk_hw_by_name(struct device_node *np, const char *name)
 {
 	struct clk *clk;
+	struct clk_hw *hw;
 
 	clk = of_clk_get_by_name(np, name);
 	if (IS_ERR(clk))
 		return ERR_PTR(-ENOENT);
 
-	return __clk_get_hw(clk);
+	hw = __clk_get_hw(clk);
+	clk_put(clk);
+
+	return hw;
 }
 EXPORT_SYMBOL_GPL(imx_get_clk_hw_by_name);
 
-- 
2.34.1