[alsa-devel] [PATCH 4/8] pwm: atmel-hlcdc: fix struct clk pointer comparing

[Nicolas Ferre]

Le 25/02/2015 15:53, Shawn Guo a écrit :
> Since commit 035a61c314eb ("clk: Make clk API return per-user struct clk
> instances"), clk API users can no longer check if two struct clk
> pointers are pointing to the same hardware clock, i.e. struct clk_hw, by
> simply comparing two pointers.  That's because with the per-user clk
> change, a brand new struct clk is created whenever clients try to look
> up the clock by calling clk_get() or sister functions like clk_get_sys()
> and of_clk_get().  This changes the original behavior where the struct
> clk is only created for once when clock driver registers the clock to
> CCF in the first place.  The net change here is before commit
> 035a61c314eb the struct clk pointer is unique for given hardware
> clock, while after the commit the pointers returned by clk lookup calls
> become different for the same hardware clock.
> 
> That said, the struct clk pointer comparing in the code doesn't work any
> more.  Call helper function clk_is_match() instead to fix the problem.
> 
> Signed-off-by: Shawn Guo <shawn.guo at linaro.org>

I agree with the fix whichever name is chosen for the function in an
future version of this series. So you can add my:
Acked-by: Nicolas Ferre <nicolas.ferre at atmel.com>

Maybe Boris can double check...

> ---
>  drivers/pwm/pwm-atmel-hlcdc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pwm/pwm-atmel-hlcdc.c b/drivers/pwm/pwm-atmel-hlcdc.c
> index 522f7075bb1a..36475949b829 100644
> --- a/drivers/pwm/pwm-atmel-hlcdc.c
> +++ b/drivers/pwm/pwm-atmel-hlcdc.c
> @@ -97,7 +97,7 @@ static int atmel_hlcdc_pwm_config(struct pwm_chip *c,
>  
>  	pwmcfg = ATMEL_HLCDC_PWMPS(pres);
>  
> -	if (new_clk != chip->cur_clk) {
> +	if (!clk_is_match(new_clk, chip->cur_clk)) {
>  		u32 gencfg = 0;
>  		int ret;
>  
> 


-- 
Nicolas Ferre