* [PATCH] pwm: atmel: add missing clk_disable_unprepare()
@ 2023-08-22 7:04 Hari Prasath Gujulan Elango
2023-08-23 4:59 ` claudiu beznea
0 siblings, 1 reply; 3+ messages in thread
From: Hari Prasath Gujulan Elango @ 2023-08-22 7:04 UTC (permalink / raw)
To: thierry.reding, u.kleine-koenig, nicolas.ferre, alexandre.belloni,
claudiu.beznea
Cc: linux-pwm, linux-arm-kernel, linux-kernel,
Hari Prasath Gujulan Elango
Fix the below smatch warning:
drivers/pwm/pwm-atmel-hlcdc.c:167 atmel_hlcdc_pwm_apply() warn: 'new_clk' from clk_prepare_enable() not released on lines: 112,137,142,149.
Signed-off-by: Hari Prasath Gujulan Elango <Hari.PrasathGE@microchip.com>
---
drivers/pwm/pwm-atmel-hlcdc.c | 17 +++++++++++++----
1 file changed, 13 insertions(+), 4 deletions(-)
diff --git a/drivers/pwm/pwm-atmel-hlcdc.c b/drivers/pwm/pwm-atmel-hlcdc.c
index 96a709a9d49a..ce46f6c74a14 100644
--- a/drivers/pwm/pwm-atmel-hlcdc.c
+++ b/drivers/pwm/pwm-atmel-hlcdc.c
@@ -108,8 +108,10 @@ static int atmel_hlcdc_pwm_apply(struct pwm_chip *c, struct pwm_device *pwm,
ATMEL_HLCDC_CFG(0),
ATMEL_HLCDC_CLKPWMSEL,
gencfg);
- if (ret)
+ if (ret) {
+ clk_disable_unprepare(new_clk);
return ret;
+ }
}
do_div(pwmcval, state->period);
@@ -133,20 +135,27 @@ static int atmel_hlcdc_pwm_apply(struct pwm_chip *c, struct pwm_device *pwm,
ATMEL_HLCDC_PWMPS_MASK |
ATMEL_HLCDC_PWMPOL,
pwmcfg);
- if (ret)
+ if (ret) {
+ clk_disable_unprepare(new_clk);
return ret;
+ }
ret = regmap_write(hlcdc->regmap, ATMEL_HLCDC_EN,
ATMEL_HLCDC_PWM);
- if (ret)
+ if (ret) {
+ clk_disable_unprepare(new_clk);
return ret;
+ }
ret = regmap_read_poll_timeout(hlcdc->regmap, ATMEL_HLCDC_SR,
status,
status & ATMEL_HLCDC_PWM,
10, 0);
- if (ret)
+ if (ret) {
+ clk_disable_unprepare(new_clk);
return ret;
+ }
+
} else {
ret = regmap_write(hlcdc->regmap, ATMEL_HLCDC_DIS,
ATMEL_HLCDC_PWM);
--
2.34.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] pwm: atmel: add missing clk_disable_unprepare()
2023-08-22 7:04 [PATCH] pwm: atmel: add missing clk_disable_unprepare() Hari Prasath Gujulan Elango
@ 2023-08-23 4:59 ` claudiu beznea
2023-08-25 3:04 ` Hari.PrasathGE
0 siblings, 1 reply; 3+ messages in thread
From: claudiu beznea @ 2023-08-23 4:59 UTC (permalink / raw)
To: Hari Prasath Gujulan Elango, thierry.reding, u.kleine-koenig,
nicolas.ferre, alexandre.belloni
Cc: linux-pwm, linux-arm-kernel, linux-kernel
On 8/22/23 10:04, Hari Prasath Gujulan Elango wrote:
> Fix the below smatch warning:
>
> drivers/pwm/pwm-atmel-hlcdc.c:167 atmel_hlcdc_pwm_apply() warn: 'new_clk' from clk_prepare_enable() not released on lines: 112,137,142,149.
>
Can you add a fixes tag?
> Signed-off-by: Hari Prasath Gujulan Elango <Hari.PrasathGE@microchip.com>
> ---
> drivers/pwm/pwm-atmel-hlcdc.c | 17 +++++++++++++----
> 1 file changed, 13 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/pwm/pwm-atmel-hlcdc.c b/drivers/pwm/pwm-atmel-hlcdc.c
> index 96a709a9d49a..ce46f6c74a14 100644
> --- a/drivers/pwm/pwm-atmel-hlcdc.c
> +++ b/drivers/pwm/pwm-atmel-hlcdc.c
> @@ -108,8 +108,10 @@ static int atmel_hlcdc_pwm_apply(struct pwm_chip *c, struct pwm_device *pwm,
> ATMEL_HLCDC_CFG(0),
> ATMEL_HLCDC_CLKPWMSEL,
> gencfg);
> - if (ret)
> + if (ret) {
> + clk_disable_unprepare(new_clk);
> return ret;
> + }
> }
>
> do_div(pwmcval, state->period);
> @@ -133,20 +135,27 @@ static int atmel_hlcdc_pwm_apply(struct pwm_chip *c, struct pwm_device *pwm,
> ATMEL_HLCDC_PWMPS_MASK |
> ATMEL_HLCDC_PWMPOL,
> pwmcfg);
> - if (ret)
> + if (ret) {
> + clk_disable_unprepare(new_clk);
> return ret;
> + }
>
> ret = regmap_write(hlcdc->regmap, ATMEL_HLCDC_EN,
> ATMEL_HLCDC_PWM);
> - if (ret)
> + if (ret) {
> + clk_disable_unprepare(new_clk);
> return ret;
> + }
>
> ret = regmap_read_poll_timeout(hlcdc->regmap, ATMEL_HLCDC_SR,
> status,
> status & ATMEL_HLCDC_PWM,
> 10, 0);
> - if (ret)
> + if (ret) {
> + clk_disable_unprepare(new_clk);
Can you keep a single failure point for all these?
Also, you have to set chip->cur_clk = NULL otherwise next time your apply
will get executed the new_clk will not be enabled.
Thank you,
Claudiu Beznea
> return ret;
> + }
> +
> } else {
> ret = regmap_write(hlcdc->regmap, ATMEL_HLCDC_DIS,
> ATMEL_HLCDC_PWM);
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] pwm: atmel: add missing clk_disable_unprepare()
2023-08-23 4:59 ` claudiu beznea
@ 2023-08-25 3:04 ` Hari.PrasathGE
0 siblings, 0 replies; 3+ messages in thread
From: Hari.PrasathGE @ 2023-08-25 3:04 UTC (permalink / raw)
To: claudiu.beznea, thierry.reding, u.kleine-koenig, Nicolas.Ferre,
alexandre.belloni
Cc: linux-pwm, linux-arm-kernel, linux-kernel
Hello Claudiu,
On 23/08/23 10:29 am, claudiu beznea wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>
> On 8/22/23 10:04, Hari Prasath Gujulan Elango wrote:
>> Fix the below smatch warning:
>>
>> drivers/pwm/pwm-atmel-hlcdc.c:167 atmel_hlcdc_pwm_apply() warn: 'new_clk' from clk_prepare_enable() not released on lines: 112,137,142,149.
>>
>
> Can you add a fixes tag?
>
yes I will add it.
>> Signed-off-by: Hari Prasath Gujulan Elango <Hari.PrasathGE@microchip.com>
>> ---
>> drivers/pwm/pwm-atmel-hlcdc.c | 17 +++++++++++++----
>> 1 file changed, 13 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/pwm/pwm-atmel-hlcdc.c b/drivers/pwm/pwm-atmel-hlcdc.c
>> index 96a709a9d49a..ce46f6c74a14 100644
>> --- a/drivers/pwm/pwm-atmel-hlcdc.c
>> +++ b/drivers/pwm/pwm-atmel-hlcdc.c
>> @@ -108,8 +108,10 @@ static int atmel_hlcdc_pwm_apply(struct pwm_chip *c, struct pwm_device *pwm,
>> ATMEL_HLCDC_CFG(0),
>> ATMEL_HLCDC_CLKPWMSEL,
>> gencfg);
>> - if (ret)
>> + if (ret) {
>> + clk_disable_unprepare(new_clk);
>> return ret;
>> + }
>> }
>>
>> do_div(pwmcval, state->period);
>> @@ -133,20 +135,27 @@ static int atmel_hlcdc_pwm_apply(struct pwm_chip *c, struct pwm_device *pwm,
>> ATMEL_HLCDC_PWMPS_MASK |
>> ATMEL_HLCDC_PWMPOL,
>> pwmcfg);
>> - if (ret)
>> + if (ret) {
>> + clk_disable_unprepare(new_clk);
>> return ret;
>> + }
>>
>> ret = regmap_write(hlcdc->regmap, ATMEL_HLCDC_EN,
>> ATMEL_HLCDC_PWM);
>> - if (ret)
>> + if (ret) {
>> + clk_disable_unprepare(new_clk);
>> return ret;
>> + }
>>
>> ret = regmap_read_poll_timeout(hlcdc->regmap, ATMEL_HLCDC_SR,
>> status,
>> status & ATMEL_HLCDC_PWM,
>> 10, 0);
>> - if (ret)
>> + if (ret) {
>> + clk_disable_unprepare(new_clk);
>
> Can you keep a single failure point for all these?
>
> Also, you have to set chip->cur_clk = NULL otherwise next time your apply
> will get executed the new_clk will not be enabled.
>
I see that new_clk is assigned to cur_clk in the if (state->enabled)
block and clk_disable_unprepare() is invoked only in the else block for
cur_clk and its made NULL. I will cleanup all of this at a single point
and resend v2.
Thanks,
Hari
> Thank you,
> Claudiu Beznea
>
>> return ret;
>> + }
>> +
>> } else {
>> ret = regmap_write(hlcdc->regmap, ATMEL_HLCDC_DIS,
>> ATMEL_HLCDC_PWM);
^ permalink raw reply [flat|nested] 3+ messages in thread
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2023-08-22 7:04 [PATCH] pwm: atmel: add missing clk_disable_unprepare() Hari Prasath Gujulan Elango
2023-08-23 4:59 ` claudiu beznea
2023-08-25 3:04 ` Hari.PrasathGE
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