Re: [PATCH] drm/amdgpu: fix autosuspend cleanup during removal

[Mario Limonciello <superm1@kernel.org>]

On 8/8/26 07:09, Guangshuo Li wrote:
> amdgpu_pci_probe() calls pm_runtime_use_autosuspend(), but
> amdgpu_pci_remove() 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 remove
> path.
> 
> This issue was found by manual code inspection.
> 
> Fixes: d38ceaf99ed0 ("drm/amdgpu: add core driver (v4)")
> Cc: stable@vger.kernel.org
> Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>

Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>

Also applied to amd-staging-drm-next.

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index 1aed121f4ddb..e814701bc8fd 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> @@ -2548,6 +2548,7 @@ amdgpu_pci_remove(struct pci_dev *pdev)
>   	if (adev->pm.rpm_mode != AMDGPU_RUNPM_NONE) {
>   		pm_runtime_get_sync(dev->dev);
>   		pm_runtime_forbid(dev->dev);
> +		pm_runtime_dont_use_autosuspend(dev->dev);
>   	}
>   
>   	amdgpu_driver_unload_kms(dev);