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Bluetooth: hci_bcm: fix usage_count leak when autosuspend_delay is negative

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bcm_request_irq() calls pm_runtime_use_autosuspend(), but bcm_close()
does not call the matching pm_runtime_dont_use_autosuspend() when
tearing down 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 driver 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: e88ab30d36 ("Bluetooth: hci_bcm: Add suspend/resume runtime PM functions")
Cc: stable@vger.kernel.org
Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Guangshuo Li
2026-08-24 13:04:03 -04:00
committed by Luiz Augusto von Dentz
parent cb19774faa
commit dc6b7c771a
1 changed files with 1 additions and 0 deletions
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drivers/bluetooth/hci_bcm.c
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@@ -547,6 +547,7 @@ static int bcm_close(struct hci_uart *hu)
if (IS_ENABLED(CONFIG_PM) && bdev->irq_acquired) {
devm_free_irq(bdev->dev, bdev->irq, bdev);
device_init_wakeup(bdev->dev, false);
pm_runtime_dont_use_autosuspend(bdev->dev);
pm_runtime_disable(bdev->dev);
}