clk: divider: Fix overflow in clk_divider_bestdiv

Commit c686078 ("clk: divider: Add round to closest divider") introduced
a helper function to check whether given divisor is the best one instead
of direct check. However due to int type used instead of unsigned long
for passing calculated rates to this function in certain cases an
overflow could occur, for example when trying to obtain maximum possible
clock rate by calling clk_round_rate(..., UINT_MAX).

This patch fixes this issue by changing the type of rate, now and best
arguments of the function to unsigned long, which is the type that
should be used for clock rates.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Acked-by: Maxime Coquelin <maxime.coquelin@st.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
(cherry picked from commit 3c17296f28820d2a9fa23e549a1e808a4df5dfc6)
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c
index 1b076cc98b07e43f496bb53f9ec3d55312b1cba1..45060200fcf0e9307b98967425284af4068becb9 100644 (file)
--- a/drivers/clk/clk-divider.c
+++ b/drivers/clk/clk-divider.c
@@ -232,7 +232,7 @@ static int _div_round(struct clk_divider *divider, unsigned long parent_rate,
 }
 
 static bool _is_best_div(struct clk_divider *divider,
-               int rate, int now, int best)
+               unsigned long rate, unsigned long now, unsigned long best)
 {
        if (divider->flags & CLK_DIVIDER_ROUND_CLOSEST)
                return abs(rate - now) < abs(rate - best);