[PATCH] i2c: nvidia-gpu: fix autosuspend cleanup

[Guangshuo Li]

gpu_i2c_probe() calls pm_runtime_use_autosuspend(), but the remove
path 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 undoing the autosuspend setting during
teardown, this reference is not dropped and usage_count remains
unbalanced.

Call pm_runtime_dont_use_autosuspend() during driver removal to
properly undo the autosuspend setting.

This issue was found by manual code inspection.

Fixes: d4a4f927e4dd ("i2c: nvidia-gpu: add runtime pm support")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Guangshuo Li <lgs201920130244@xxxxxxxxx>
---
 drivers/i2c/busses/i2c-nvidia-gpu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/i2c/busses/i2c-nvidia-gpu.c b/drivers/i2c/busses/i2c-nvidia-gpu.c
index 14c059b03945..9dbe1fe22412 100644
--- a/drivers/i2c/busses/i2c-nvidia-gpu.c
+++ b/drivers/i2c/busses/i2c-nvidia-gpu.c
@@ -334,6 +334,7 @@ static void gpu_i2c_remove(struct pci_dev *pdev)
 	struct gpu_i2c_dev *i2cd = pci_get_drvdata(pdev);
 
 	pm_runtime_get_noresume(i2cd->dev);
+	pm_runtime_dont_use_autosuspend(i2cd->dev);
 	i2c_del_adapter(&i2cd->adapter);
 	pci_free_irq_vectors(pdev);
 }
-- 
2.43.0