[PATCH] drm/tegra: gr3d: fix autosuspend cleanup during teardown

gr3d_probe() calls pm_runtime_use_autosuspend(), but gr3d_remove()
does not call the matching pm_runtime_dont_use_autosuspend() during
teardown.

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.

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 driver
remove path.

This issue was found by manual code inspection.

Fixes: 62fa0a985e2c ("drm/tegra: Enable runtime PM during probe")
Cc: [email protected]
Signed-off-by: Guangshuo Li <[email protected]>
---
 drivers/gpu/drm/tegra/gr3d.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/tegra/gr3d.c b/drivers/gpu/drm/tegra/gr3d.c
index 1ec6ced959e4..5fd1fd32fcc0 100644
--- a/drivers/gpu/drm/tegra/gr3d.c
+++ b/drivers/gpu/drm/tegra/gr3d.c
@@ -534,6 +534,7 @@ static void gr3d_remove(struct platform_device *pdev)
 {
 	struct gr3d *gr3d = platform_get_drvdata(pdev);
 
+	pm_runtime_dont_use_autosuspend(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
 	host1x_client_unregister(&gr3d->client.base);
 }
-- 
2.43.0