Reviewed-by: Lyude Paul <[email protected]>
Will push to drm-misc-fixes in just a moment
On Sat, 2026-08-08 at 21:41 +0800, Guangshuo Li wrote:
> nouveau_drm_device_init() calls pm_runtime_use_autosuspend(), but
> nouveau_drm_device_fini() does not call the matching
> pm_runtime_dont_use_autosuspend().
>
> 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.
>
> The documentation for pm_runtime_use_autosuspend() also notes that it
> is important to undo it with pm_runtime_dont_use_autosuspend() at
> driver exit time, unless runtime PM was initially enabled with
> devm_pm_runtime_enable().
>
> Add the missing pm_runtime_dont_use_autosuspend() call to the common
> device teardown path.
>
> This issue was found by manual code inspection.
>
> Fixes: 5addcf0a5f0f ("nouveau: add runtime PM support (v0.9)")
> Cc: [email protected]
> Signed-off-by: Guangshuo Li <[email protected]>
> ---
> drivers/gpu/drm/nouveau/nouveau_drm.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c
> b/drivers/gpu/drm/nouveau/nouveau_drm.c
> index e16f59b00f6f..1579a4b0785e 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_drm.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
> @@ -585,6 +585,7 @@ nouveau_drm_device_fini(struct nouveau_drm *drm)
> if (nouveau_pmops_runtime()) {
> pm_runtime_get_sync(dev->dev);
> pm_runtime_forbid(dev->dev);
> + pm_runtime_dont_use_autosuspend(dev->dev);
> }
>
> nouveau_led_fini(dev);
