pwm: Fix incorrect variable used in error message

[PATCH][next] pwm: Fix incorrect variable used in error message

Posted by Colin Ian King 5 months, 1 week ago

The dev_err message is reporting the incorrect return value ret_tohw,
it should be reporting the value in ret_fromhw. Fix this by using
ret_fromhw instead of ret_tohw.

Fixes: 6c5126c6406d ("pwm: Provide new consumer API functions for waveforms")
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
---
 drivers/pwm/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index ec4112e6209a..ea2ccf42e814 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -276,7 +276,7 @@ int pwm_round_waveform_might_sleep(struct pwm_device *pwm, struct pwm_waveform *
 
 	if (IS_ENABLED(CONFIG_PWM_DEBUG) && ret_fromhw > 0)
 		dev_err(&chip->dev, "Unexpected return value from __pwm_round_waveform_fromhw: requested %llu/%llu [+%llu], return value %d\n",
-			wf_req.duty_length_ns, wf_req.period_length_ns, wf_req.duty_offset_ns, ret_tohw);
+			wf_req.duty_length_ns, wf_req.period_length_ns, wf_req.duty_offset_ns, ret_fromhw);
 
 	if (IS_ENABLED(CONFIG_PWM_DEBUG) &&
 	    (ret_tohw == 0) != pwm_check_rounding(&wf_req, wf))
-- 
2.51.0

Re: [PATCH][next] pwm: Fix incorrect variable used in error message

Posted by Uwe Kleine-König 5 months ago

On Tue, Sep 02, 2025 at 02:03:48PM +0100, Colin Ian King wrote:
> The dev_err message is reporting the incorrect return value ret_tohw,
> it should be reporting the value in ret_fromhw. Fix this by using
> ret_fromhw instead of ret_tohw.
> 
> Fixes: 6c5126c6406d ("pwm: Provide new consumer API functions for waveforms")
> Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
> ---
>  drivers/pwm/core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
> index ec4112e6209a..ea2ccf42e814 100644
> --- a/drivers/pwm/core.c
> +++ b/drivers/pwm/core.c
> @@ -276,7 +276,7 @@ int pwm_round_waveform_might_sleep(struct pwm_device *pwm, struct pwm_waveform *
>  
>  	if (IS_ENABLED(CONFIG_PWM_DEBUG) && ret_fromhw > 0)
>  		dev_err(&chip->dev, "Unexpected return value from __pwm_round_waveform_fromhw: requested %llu/%llu [+%llu], return value %d\n",
> -			wf_req.duty_length_ns, wf_req.period_length_ns, wf_req.duty_offset_ns, ret_tohw);
> +			wf_req.duty_length_ns, wf_req.period_length_ns, wf_req.duty_offset_ns, ret_fromhw);
>  
>  	if (IS_ENABLED(CONFIG_PWM_DEBUG) &&
>  	    (ret_tohw == 0) != pwm_check_rounding(&wf_req, wf))

Indeed, thanks for the fix. I added it to my pwm/fixes branch at
https://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux.git. I
didn't made my mind up yet if the patches contained in there are
relevant enough to send it to Linus before 6.17.

Best regards
Uwe