[PATCH v2] clk:mmp: clk-mix.c fix divide-by-zero

[nixiaoming]

The _get_div function has a branch with a return value of 0
Add a check on the return value of _get_div to avoid divide-by-zero

Signed-off-by: nixiaoming <nixiaom...@huawei.com>
Reviewed-by: Mukesh Ojha <mo...@codeaurora.org>
---
 drivers/clk/mmp/clk-mix.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/clk/mmp/clk-mix.c b/drivers/clk/mmp/clk-mix.c
index 90814b2..6ed5ad7 100644
--- a/drivers/clk/mmp/clk-mix.c
+++ b/drivers/clk/mmp/clk-mix.c
@@ -245,6 +245,9 @@ static int mmp_clk_mix_determine_rate(struct clk_hw *hw,
                        div_val_max = _get_maxdiv(mix);
                        for (j = 0; j < div_val_max; j++) {
                                div = _get_div(mix, j);
+                               /* avoid divide-by-zero */
+                               if (!div)
+                                       continue;
                                mix_rate = parent_rate / div;
                                gap = abs(mix_rate - req->rate);
                                if (!parent_best || gap < gap_best) {
@@ -341,6 +344,9 @@ static unsigned long mmp_clk_mix_recalc_rate(struct clk_hw 
*hw,
        shift = mix->reg_info.shift_div;
 
        div = _get_div(mix, MMP_CLK_BITS_GET_VAL(mux_div, width, shift));
+       /* avoid divide-by-zero */
+       if (!div)
+               return -EINVAL;
 
        return parent_rate / div;
 }
-- 
1.8.5.6