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

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

[Guangshuo Li]

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: e88ab30d3669 ("Bluetooth: hci_bcm: Add suspend/resume runtime PM functions")
Cc: stable@vger.kernel.org
Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
---
 drivers/bluetooth/hci_bcm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c
index 1a4fc3882fd2..cc419e1960de 100644
--- a/drivers/bluetooth/hci_bcm.c
+++ b/drivers/bluetooth/hci_bcm.c
@@ -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);
 		}
 
-- 
2.43.0

RE: Bluetooth: hci_bcm: fix usage_count leak when autosuspend_delay is negative

[bluez.test.bot]

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This is automated email and please do not reply to this email!

Dear submitter,

Thank you for submitting the patches to the linux bluetooth mailing list.
This is a CI test results with your patch series:
PW Link:https://patchwork.kernel.org/project/bluetooth/list/?series=1142532

---Test result---

Test Summary:
CheckPatch                    PASS      0.52 seconds
VerifyFixes                   PASS      0.08 seconds
VerifySignedoff               PASS      0.09 seconds
GitLint                       PASS      0.22 seconds
SubjectPrefix                 PASS      0.60 seconds
BuildKernel                   PASS      21.06 seconds
CheckAllWarning               PASS      23.27 seconds
CheckSparse                   PASS      21.81 seconds
BuildKernel32                 PASS      20.67 seconds
CheckKernelLLVM               SKIP      0.00 seconds
TestRunnerSetup               PASS      372.68 seconds
IncrementalBuild              PASS      19.44 seconds

Details
##############################
Test: CheckKernelLLVM - SKIP
Desc: Build kernel with LLVM + context analysis
Output:
Clang not found


https://github.com/bluez/bluetooth-next/pull/555

---
Regards,
Linux Bluetooth

Re: [PATCH] Bluetooth: hci_bcm: 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 13:15:32 +0800 you wrote:
> 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.
> 
> [...]

Here is the summary with links:
  - Bluetooth: hci_bcm: fix usage_count leak when autosuspend_delay is negative
    https://git.kernel.org/bluetooth/bluetooth-next/c/32b42c0704fd

You are awesome, thank you!
-- 
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