[PATCH 5.19 030/155] Bluetooth: hci_sync: Fix suspend performance regression

Greg Kroah-Hartman
2022-09-06T14:02:49Z

From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

[ Upstream commit 1fd02d56dae35b08e4cba8e6bd2c2e7ccff68ecc ]

This attempts to fix suspend performance when there is no connections by
not updating the event mask.

Fixes: ef61b6ea1544 ("Bluetooth: Always set event mask on suspend")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/bluetooth/hci_sync.c | 24 ++++++++++++++----------
1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
index b5e7d4b8ab24a..2012f23158839 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -4967,17 +4967,21 @@ int hci_suspend_sync(struct hci_dev *hdev)
/* Prevent disconnects from causing scanning to be re-enabled */
hci_pause_scan_sync(hdev);

- /* Soft disconnect everything (power off) */
- err = hci_disconnect_all_sync(hdev, HCI_ERROR_REMOTE_POWER_OFF);
- if (err) {
- /* Set state to BT_RUNNING so resume doesn't notify */
- hdev->suspend_state = BT_RUNNING;
- hci_resume_sync(hdev);
- return err;
- }
+ if (hci_conn_count(hdev)) {
+ /* Soft disconnect everything (power off) */
+ err = hci_disconnect_all_sync(hdev, HCI_ERROR_REMOTE_POWER_OFF);
+ if (err) {
+ /* Set state to BT_RUNNING so resume doesn't notify */
+ hdev->suspend_state = BT_RUNNING;
+ hci_resume_sync(hdev);
+ return err;
+ }

- /* Update event mask so only the allowed event can wakeup the host */
- hci_set_event_mask_sync(hdev);
+ /* Update event mask so only the allowed event can wakeup the
+ * host.
+ */
+ hci_set_event_mask_sync(hdev);
+ }

/* Only configure accept list if disconnect succeeded and wake
* isn't being prevented.
--
2.35.1