clk: zynqmp: Add a check for NULL pointer

[ Upstream commit 6ab9810cfe ]

Add a NULL pointer check as clk_hw_get_parent can return NULL.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Link: https://lore.kernel.org/r/20220518055314.2486-1-shubhrajyoti.datta@xilinx.com
Acked-by: Michal Simek <michal.simek@amd.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Stable-dep-of: 1fe15be1fb61 ("drivers: clk: zynqmp: update divider round rate logic")
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/clk/zynqmp/divider.c

@@ -120,10 +120,13 @@ static void zynqmp_get_divider2_val(struct clk_hw *hw,
 	long error = LONG_MAX;
 	unsigned long div1_prate;
 	struct clk_hw *div1_parent_hw;
+	struct zynqmp_clk_divider *pdivider;
 	struct clk_hw *div2_parent_hw = clk_hw_get_parent(hw);
-	struct zynqmp_clk_divider *pdivider =
-				to_zynqmp_clk_divider(div2_parent_hw);
 
+	if (!div2_parent_hw)
+		return;
+
+	pdivider = to_zynqmp_clk_divider(div2_parent_hw);
 	if (!pdivider)
 		return;