[PATCH] clk: mvebu: Prevent division by zero in clk_double_div_recalc_rate()

[Alexandra Diupina]

get_div() may return zero, so it is necessary to check
before calling DIV_ROUND_UP_ULL().

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 8ca4746a78ab ("clk: mvebu: Add the peripheral clock driver for Armada 3700")
Signed-off-by: Alexandra Diupina <adiupina@xxxxxxxxxxxxx>
---
 drivers/clk/mvebu/armada-37xx-periph.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/mvebu/armada-37xx-periph.c b/drivers/clk/mvebu/armada-37xx-periph.c
index 8701a58a5804..d0e1d591e4f2 100644
--- a/drivers/clk/mvebu/armada-37xx-periph.c
+++ b/drivers/clk/mvebu/armada-37xx-periph.c
@@ -343,7 +343,10 @@ static unsigned long clk_double_div_recalc_rate(struct clk_hw *hw,
 	div = get_div(double_div->reg1, double_div->shift1);
 	div *= get_div(double_div->reg2, double_div->shift2);
 
-	return DIV_ROUND_UP_ULL((u64)parent_rate, div);
+	if (!div)
+		return 0;
+	else
+		return DIV_ROUND_UP_ULL((u64)parent_rate, div);
 }
 
 static const struct clk_ops clk_double_div_ops = {
-- 
2.30.2