Re: [PATCH] dmaengine: pl330: fix autosuspend cleanup during removal

[Krzysztof Kozlowski]

On 18/08/2026 10:35, Johan Hovold wrote:
> On Sat, Aug 08, 2026 at 05:44:52PM +0800, Guangshuo Li wrote:
>> pl330_probe() calls pm_runtime_use_autosuspend(), but pl330_remove()
>> does not call the matching pm_runtime_dont_use_autosuspend() when
>> removing the device.
>>
>> 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.
> 
> As I've explained elsewhere, this is just misleading. There is no usage
> count leak here as the count is balanced whenever the user re-enables
> autosuspend through sysfs (by writing a non-negative timeout).
> 
> Drivers should clean up after themselves and disable autosuspend, but
> this is more of a clean up than a fix and should not be backported.
> 
> You've sent upwards of 60 of these in the matter of a just a few days,
> some which have even been picked up. Please send follow-ups (replies or
> v2s) as soon as possible to prevent further of these from getting
> merged.
> 
>> Add the missing pm_runtime_dont_use_autosuspend() call before restoring
>> the runtime PM usage reference in the remove path.
>>
>> This issue was found by manual code inspection.
>>
>> Fixes: ae43b3289186 ("ARM: 8202/1: dmaengine: pl330: Add runtime Power Management support v12")
>> Cc: stable@xxxxxxxxxxxxxxx
>> Signed-off-by: Guangshuo Li <lgs201920130244@xxxxxxxxx>


So EVERY patch was sent separately, even when targeting the same subsystem:
https://lore.kernel.org/all/?q=f%3Algs201920130244%40gmail.com

making it IMPOSSIBLE to respond in efficient way. This is just unacceptable.

Best regards,
Krzysztof