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

[Wentao Liang]

imx_obtain_fixed_clock_hw() obtains the clock through
imx_obtain_fixed_clock_from_dt(), which creates a consumer reference
via of_clk_get_from_provider(). The reference is discarded right after
__clk_get_hw() returns the hardware pointer, leaking it.

Keep the imx_clk_fixed() fallback unchanged and drop the DT-obtained
consumer reference with clk_put() once the hardware pointer has been
extracted.

Fixes: a4a4069f4523 ("clk: imx: Add imx_obtain_fixed_clock clk_hw based variant")
Cc: stable at vger.kernel.org
Signed-off-by: Wentao Liang <vulab at iscas.ac.cn>
---
 drivers/clk/imx/clk.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/imx/clk.c b/drivers/clk/imx/clk.c
index e113e30514fa..49e51e949f71 100644
--- a/drivers/clk/imx/clk.c
+++ b/drivers/clk/imx/clk.c
@@ -95,11 +95,16 @@ struct clk_hw *imx_obtain_fixed_clock_hw(
 			const char *name, unsigned long rate)
 {
 	struct clk *clk;
+	struct clk_hw *hw;
 
 	clk = imx_obtain_fixed_clock_from_dt(name);
 	if (IS_ERR(clk))
-		clk = imx_clk_fixed(name, rate);
-	return __clk_get_hw(clk);
+		return __clk_get_hw(imx_clk_fixed(name, rate));
+
+	hw = __clk_get_hw(clk);
+	clk_put(clk);
+
+	return hw;
 }
 
 struct clk_hw *imx_obtain_fixed_of_clock(struct device_node *np,
-- 
2.34.1