Currently it is not made explicit why clk_fixed_set_rate() can ignore its arguments and unconditionally return success. Add a comment to explain this.

We also mark the clk_ops table const since it should never be modified at runtime.

Suggested-by: Stephen Boyd sboyd@codeaurora.org Signed-off-by: Daniel Thompson daniel.thompson@linaro.org ---

Notes: Changes here emerged from Stephen Boyd's code review of (partiall) borrowed code. This patch applies his review comments to the original code.

drivers/clk/clk-fixed-factor.c | 8 +++++++- include/linux/clk-provider.h | 2 +- 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/clk-fixed-factor.c b/drivers/clk/clk-fixed-factor.c index e186db2..fccabe4 100644 --- a/drivers/clk/clk-fixed-factor.c +++ b/drivers/clk/clk-fixed-factor.c @@ -55,10 +55,16 @@ static long clk_factor_round_rate(struct clk_hw *hw, unsigned long rate, static int clk_factor_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long parent_rate) { + /* + * We must report success but we can do so unconditionally because + * clk_factor_round_rate returns values that ensure this call is a + * nop. + */ + return 0; }

-struct clk_ops clk_fixed_factor_ops = { +const struct clk_ops clk_fixed_factor_ops = { .round_rate = clk_factor_round_rate, .set_rate = clk_factor_set_rate, .recalc_rate = clk_factor_recalc_rate, diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index 6d55c31..1af9579 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -459,7 +459,7 @@ struct clk_fixed_factor { unsigned int div; };

-extern struct clk_ops clk_fixed_factor_ops; +extern const struct clk_ops clk_fixed_factor_ops; struct clk *clk_register_fixed_factor(struct device *dev, const char *name, const char *parent_name, unsigned long flags, unsigned int mult, unsigned int div); -- 2.4.2