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

[Guangshuo Li]

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@xxxxxxxxxxxxxxx
Signed-off-by: Guangshuo Li <lgs201920130244@xxxxxxxxx>
---
 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);
-- 
2.43.0