[PATCH] Bluetooth: hci_h5: fix usage_count leak when autosuspend_delay is negative
Guangshuo Li <[email protected]>
| Newsgroups | org.kernel.vger.linux-bluetooth,org.kernel.vger.linux-kernel,org.kernel.vger.stable |
|---|---|
| Message-ID | <[email protected]> |
h5_btrtl_open() calls pm_runtime_use_autosuspend(), but
h5_btrtl_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: d9dd833cf6d2 ("Bluetooth: hci_h5: Add runtime suspend")
Cc: [email protected]
Signed-off-by: Guangshuo Li <[email protected]>
---
drivers/bluetooth/hci_h5.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index 93cdde981840..a5e7e9b0ea74 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -1023,8 +1023,10 @@ static void h5_btrtl_open(struct h5 *h5)
static void h5_btrtl_close(struct h5 *h5)
{
- if (!test_bit(H5_WAKEUP_DISABLE, &h5->flags))
+ if (!test_bit(H5_WAKEUP_DISABLE, &h5->flags)) {
+ pm_runtime_dont_use_autosuspend(&h5->hu->serdev->dev);
pm_runtime_disable(&h5->hu->serdev->dev);
+ }
gpiod_set_value_cansleep(h5->device_wake_gpio, 0);
gpiod_set_value_cansleep(h5->enable_gpio, 0);
--
2.43.0