[PATCH] dmaengine: ste_dma40: fix autosuspend cleanup on probe failure

[PATCH] dmaengine: ste_dma40: fix autosuspend cleanup on probe failure

[Guangshuo Li]

d40_probe() calls pm_runtime_use_autosuspend(), but its error path does
not call 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 cleanup, this reference is not dropped and usage_count remains
unbalanced.

Add the missing pm_runtime_dont_use_autosuspend() call to the probe
failure path before disabling runtime PM.

This issue was found by manual code inspection.

Fixes: 8d318a50b3d7 ("DMAENGINE: Support for ST-Ericssons DMA40 block v3")
Cc: stable@vger.kernel.org
Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
---
 drivers/dma/ste_dma40.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 0d9ffa3e2663..e2ad50e0fec4 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -3654,6 +3654,7 @@ static int __init d40_probe(struct platform_device *pdev)
 		regulator_disable(base->lcpa_regulator);
 		regulator_put(base->lcpa_regulator);
 	}
+	pm_runtime_dont_use_autosuspend(base->dev);
 	pm_runtime_disable(base->dev);
 
  report_failure:
-- 
2.43.0

Re: [PATCH] dmaengine: ste_dma40: fix autosuspend cleanup on probe failure

[Linus Walleij]

On Sat, Aug 8, 2026 at 12:57 PM Guangshuo Li <lgs201920130244@gmail.com> wrote:

> d40_probe() calls pm_runtime_use_autosuspend(), but its error path does
> not call 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 cleanup, this reference is not dropped and usage_count remains
> unbalanced.
>
> Add the missing pm_runtime_dont_use_autosuspend() call to the probe
> failure path before disabling runtime PM.
>
> This issue was found by manual code inspection.
>
> Fixes: 8d318a50b3d7 ("DMAENGINE: Support for ST-Ericssons DMA40 block v3")
> Cc: stable@vger.kernel.org
> Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>

Reviewed-by: Linus Walleij <linusw@kernel.org>

Yours,
Linus Walleij

Re: [PATCH] dmaengine: ste_dma40: fix autosuspend cleanup on probe failure

[Krzysztof Kozlowski]

On 08/08/2026 12:56, Guangshuo Li wrote:
> d40_probe() calls pm_runtime_use_autosuspend(), but its error path does
> not call 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 cleanup, this reference is not dropped and usage_count remains
> unbalanced.
> 
> Add the missing pm_runtime_dont_use_autosuspend() call to the probe
> failure path before disabling runtime PM.
> 
> This issue was found by manual code inspection.
> 
> Fixes: 8d318a50b3d7 ("DMAENGINE: Support for ST-Ericssons DMA40 block v3")
> 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