[PATCH] crypto: stm32/cryp: fix autosuspend cleanup during teardown

[PATCH] crypto: stm32/cryp: fix autosuspend cleanup during teardown

[Guangshuo Li]

stm32_cryp_probe() calls pm_runtime_use_autosuspend(), but neither the
probe failure path nor stm32_cryp_remove() calls the matching
pm_runtime_dont_use_autosuspend() before disabling runtime PM.

If the autosuspend delay is set to a negative value while autosuspend
is enabled, the runtime PM core increments usage_count to prevent
runtime suspend. Without calling pm_runtime_dont_use_autosuspend()
during teardown, this reference is not dropped and usage_count remains
unbalanced.

Add the missing pm_runtime_dont_use_autosuspend() calls to both the
probe failure and remove paths before disabling runtime PM.

This issue was found by manual code inspection.

Fixes: 65f9aa36ee47 ("crypto: stm32/cryp - Add power management support")
Cc: stable@vger.kernel.org
Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
---
 drivers/crypto/stm32/stm32-cryp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/crypto/stm32/stm32-cryp.c b/drivers/crypto/stm32/stm32-cryp.c
index b79877099942..74f6e329b1fa 100644
--- a/drivers/crypto/stm32/stm32-cryp.c
+++ b/drivers/crypto/stm32/stm32-cryp.c
@@ -2691,6 +2691,7 @@ static int stm32_cryp_probe(struct platform_device *pdev)
 		dma_release_channel(cryp->dma_lch_out);
 err_dma:
 err_rst:
+	pm_runtime_dont_use_autosuspend(dev);
 	pm_runtime_disable(dev);
 	pm_runtime_put_noidle(dev);
 
@@ -2722,6 +2723,7 @@ static void stm32_cryp_remove(struct platform_device *pdev)
 	if (cryp->dma_lch_out)
 		dma_release_channel(cryp->dma_lch_out);
 
+	pm_runtime_dont_use_autosuspend(cryp->dev);
 	pm_runtime_disable(cryp->dev);
 	pm_runtime_put_noidle(cryp->dev);
 
-- 
2.43.0

Re: [PATCH] crypto: stm32/cryp: fix autosuspend cleanup during teardown

[Maxime MERE]

On 8/8/26 11:36, Guangshuo Li wrote:
> stm32_cryp_probe() calls pm_runtime_use_autosuspend(), but neither the
> probe failure path nor stm32_cryp_remove() calls the matching
> pm_runtime_dont_use_autosuspend() before disabling runtime PM.
> 
> If the autosuspend delay is set to a negative value while autosuspend
> is enabled, the runtime PM core increments usage_count to prevent
> runtime suspend. Without calling pm_runtime_dont_use_autosuspend()
> during teardown, this reference is not dropped and usage_count remains
> unbalanced.
> 
> Add the missing pm_runtime_dont_use_autosuspend() calls to both the
> probe failure and remove paths before disabling runtime PM.
> 
> This issue was found by manual code inspection.
> 
> Fixes: 65f9aa36ee47 ("crypto: stm32/cryp - Add power management support")
> Cc: stable@vger.kernel.org
> Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
> ---
>   drivers/crypto/stm32/stm32-cryp.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/crypto/stm32/stm32-cryp.c b/drivers/crypto/stm32/stm32-cryp.c
> index b79877099942..74f6e329b1fa 100644
> --- a/drivers/crypto/stm32/stm32-cryp.c
> +++ b/drivers/crypto/stm32/stm32-cryp.c
> @@ -2691,6 +2691,7 @@ static int stm32_cryp_probe(struct platform_device *pdev)
>   		dma_release_channel(cryp->dma_lch_out);
>   err_dma:
>   err_rst:
> +	pm_runtime_dont_use_autosuspend(dev);
>   	pm_runtime_disable(dev);
>   	pm_runtime_put_noidle(dev);
>   
> @@ -2722,6 +2723,7 @@ static void stm32_cryp_remove(struct platform_device *pdev)
>   	if (cryp->dma_lch_out)
>   		dma_release_channel(cryp->dma_lch_out);
>   
> +	pm_runtime_dont_use_autosuspend(cryp->dev);
>   	pm_runtime_disable(cryp->dev);
>   	pm_runtime_put_noidle(cryp->dev);
>   

Reviewed-by: Maxime Méré <maxime.mere@foss.st.com>

Cheers,

Maxime

Re: [PATCH] crypto: stm32/cryp: fix autosuspend cleanup during teardown

[Krzysztof Kozlowski]

On 08/08/2026 11:36, Guangshuo Li wrote:
> stm32_cryp_probe() calls pm_runtime_use_autosuspend(), but neither the
> probe failure path nor stm32_cryp_remove() calls the matching
> pm_runtime_dont_use_autosuspend() before disabling runtime PM.
> 
> If the autosuspend delay is set to a negative value while autosuspend
> is enabled, the runtime PM core increments usage_count to prevent
> runtime suspend. Without calling pm_runtime_dont_use_autosuspend()
> during teardown, this reference is not dropped and usage_count remains
> unbalanced.
> 
> Add the missing pm_runtime_dont_use_autosuspend() calls to both the
> probe failure and remove paths before disabling runtime PM.
> 
> This issue was found by manual code inspection.
> 
> Fixes: 65f9aa36ee47 ("crypto: stm32/cryp - Add power management support")
> Cc: stable@vger.kernel.org
> Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>

You sent vast amount of patches, all separate, making it very difficult
to track and respond in efficient way. Do not do that.

Group your work per subsystem.

You were asked to clarify and respond to incorrect fixes statement. I do
not see how you clarified and responded at all.

Best regards,
Krzysztof