[PATCH] Bluetooth: hci_intel: fix usage_count leak when autosuspend_delay is negative

[Guangshuo Li]

intel_set_power() calls pm_runtime_use_autosuspend() when powering on
the device, but the power-off path does not call the matching
pm_runtime_dont_use_autosuspend() before disabling runtime PM.

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.

Add the missing pm_runtime_dont_use_autosuspend() call before disabling
runtime PM.

This issue was found by manual code inspection.

Fixes: 74cdad37cd24 ("Bluetooth: hci_intel: Add runtime PM support")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Guangshuo Li <lgs201920130244@xxxxxxxxx>
---
 drivers/bluetooth/hci_intel.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/bluetooth/hci_intel.c b/drivers/bluetooth/hci_intel.c
index c31105b91e47..1919547ff2a1 100644
--- a/drivers/bluetooth/hci_intel.c
+++ b/drivers/bluetooth/hci_intel.c
@@ -345,6 +345,7 @@ static int intel_set_power(struct hci_uart *hu, bool powered)
 			devm_free_irq(&idev->pdev->dev, idev->irq, idev);
 			device_wakeup_disable(&idev->pdev->dev);
 
+			pm_runtime_dont_use_autosuspend(&idev->pdev->dev);
 			pm_runtime_disable(&idev->pdev->dev);
 		}
 	}
-- 
2.43.0