[PATCH] i2c: mv64xxx: fix autosuspend cleanup

[PATCH] i2c: mv64xxx: fix autosuspend cleanup

[Guangshuo Li]

mv64xxx_i2c_probe() calls pm_runtime_use_autosuspend(), but the probe
failure and remove paths do 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 undoing the autosuspend setting during
teardown, this reference is not dropped and usage_count remains
unbalanced.

Call pm_runtime_dont_use_autosuspend() in both the probe failure and
remove paths before disabling runtime PM to properly undo the
autosuspend setting.

This issue was found by manual code inspection.

Fixes: e5c02cf54154 ("i2c: mv64xxx: Add runtime PM support")
Cc: stable@vger.kernel.org
Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
---
 drivers/i2c/busses/i2c-mv64xxx.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
index 1acba628e16c..995b0e9b7f53 100644
--- a/drivers/i2c/busses/i2c-mv64xxx.c
+++ b/drivers/i2c/busses/i2c-mv64xxx.c
@@ -1069,6 +1069,7 @@ mv64xxx_i2c_probe(struct platform_device *pd)
 exit_free_irq:
 	free_irq(drv_data->irq, drv_data);
 exit_disable_pm:
+	pm_runtime_dont_use_autosuspend(&pd->dev);
 	pm_runtime_disable(&pd->dev);
 	if (!pm_runtime_status_suspended(&pd->dev))
 		mv64xxx_i2c_runtime_suspend(&pd->dev);
@@ -1083,6 +1084,7 @@ mv64xxx_i2c_remove(struct platform_device *pd)
 
 	i2c_del_adapter(&drv_data->adapter);
 	free_irq(drv_data->irq, drv_data);
+	pm_runtime_dont_use_autosuspend(&pd->dev);
 	pm_runtime_disable(&pd->dev);
 	if (!pm_runtime_status_suspended(&pd->dev))
 		mv64xxx_i2c_runtime_suspend(&pd->dev);
-- 
2.43.0

Re: [PATCH] i2c: mv64xxx: fix autosuspend cleanup

[Krzysztof Kozlowski]

On 12/08/2026 10:58, Guangshuo Li wrote:
> mv64xxx_i2c_probe() calls pm_runtime_use_autosuspend(), but the probe
> failure and remove paths do 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 undoing the autosuspend setting during
> teardown, this reference is not dropped and usage_count remains
> unbalanced.
> 
> Call pm_runtime_dont_use_autosuspend() in both the probe failure and
> remove paths before disabling runtime PM to properly undo the
> autosuspend setting.
> 
> This issue was found by manual code inspection.
> 
> Fixes: e5c02cf54154 ("i2c: mv64xxx: Add runtime PM support")
> Cc: stable@vger.kernel.org
> Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
> ---
>  drivers/i2c/busses/i2c-mv64xxx.c | 2 ++
>  1 file changed, 2 insertions(+)

Srsly, one more separate I2C posting, just like you did for dma, crypto,
drm and everywhere else. You seriously waste our time.

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