[PATCH 1/7] clk: actions: Fix factor clk struct member access

From: Manivannan Sadhasivam
Date: Sat Jun 08 2019 - 15:58:34 EST

Since the helper "owl_factor_helper_round_rate" is shared between factor
and composite clocks, using the factor clk specific helper function
like "hw_to_owl_factor" to access its members will create issues when
called from composite clk specific code. Hence, pass the "factor_hw"
struct pointer directly instead of fetching it using factor clk specific

This issue has been observed when a composite clock like "sd0_clk" tried
to call "owl_factor_helper_round_rate" resulting in pointer dereferencing

Fixes: 4bb78fc9744a ("clk: actions: Add factor clock support")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
drivers/clk/actions/owl-factor.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/clk/actions/owl-factor.c b/drivers/clk/actions/owl-factor.c
index 317d4a9e112e..f419dfdd334f 100644
--- a/drivers/clk/actions/owl-factor.c
+++ b/drivers/clk/actions/owl-factor.c
@@ -64,11 +64,10 @@ static unsigned int _get_table_val(const struct clk_factor_table *table,
return val;

-static int clk_val_best(struct clk_hw *hw, unsigned long rate,
+static int clk_val_best(const struct owl_factor_hw *factor_hw,
+ struct clk_hw *hw, unsigned long rate,
unsigned long *best_parent_rate)
- struct owl_factor *factor = hw_to_owl_factor(hw);
- struct owl_factor_hw *factor_hw = &factor->factor_hw;
const struct clk_factor_table *clkt = factor_hw->table;
unsigned long parent_rate, try_parent_rate, best = 0, cur_rate;
unsigned long parent_rate_saved = *best_parent_rate;
@@ -126,7 +125,7 @@ long owl_factor_helper_round_rate(struct owl_clk_common *common,
const struct clk_factor_table *clkt = factor_hw->table;
unsigned int val, mul = 0, div = 1;

- val = clk_val_best(&common->hw, rate, parent_rate);
+ val = clk_val_best(factor_hw, &common->hw, rate, parent_rate);
_get_table_div_mul(clkt, val, &mul, &div);

return *parent_rate * mul / div;