clk: shmobile: div6: Avoid division by zero in .round_rate()

Anyone may call clk_round_rate() with a zero rate value, so we have to
protect against that.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Michael Turquette <mturquette@linaro.org>

diff --git a/drivers/clk/shmobile/clk-div6.c b/drivers/clk/shmobile/clk-div6.c
index efbaf6c81b7530b89b52967e087f6e4aa689122b..036a692c72195db93760e40dc1fcb1928b1ecded 100644 (file)
--- a/drivers/clk/shmobile/clk-div6.c
+++ b/drivers/clk/shmobile/clk-div6.c
@@ -90,6 +90,9 @@ static unsigned int cpg_div6_clock_calc_div(unsigned long rate,
 {
        unsigned int div;
 
+       if (!rate)
+               rate = 1;
+
        div = DIV_ROUND_CLOSEST(parent_rate, rate);
        return clamp_t(unsigned int, div, 1, 64);
 }