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

[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@vger.kernel.org
Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
---
 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

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

[patchwork-bot+bluetooth]

Hello:

This patch was applied to bluetooth/bluetooth-next.git (master)
by Luiz Augusto von Dentz <luiz.von.dentz@intel.com>:

On Sat,  8 Aug 2026 13:30:57 +0800 you wrote:
> 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.
> 
> [...]

Here is the summary with links:
  - Bluetooth: hci_intel: fix usage_count leak when autosuspend_delay is negative
    https://git.kernel.org/bluetooth/bluetooth-next/c/bc2791e60e08

You are awesome, thank you!
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