Hi Andreas,

On Mon, Jun 10, 2019 at 03:36:42PM +0200, Andreas Färber wrote:

Hi Mani,

Am 08.06.19 um 21:53 schrieb Manivannan Sadhasivam:

quoted

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
helpers.

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

Fixes: 4bb78fc9744a ("clk: actions: Add factor clock support")
Signed-off-by: Manivannan Sadhasivam <redacted>
---
 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;

While at it, I think it would be a good idea to rename it to
owl_clk_val_best. Pretty confusing that you're touching only owl files
for a clk_ refactoring, which sounds like common clk code.

Sure, will do.

Thanks,
Mani

Regards,
Andreas

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