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From:   Luiz Augusto von Dentz <luiz.dentz@gmail.com>
To:     linux-bluetooth@vger.kernel.org
Subject: [PATCH] Bluetooth: hci_sync: Fix suspend performance regression
Date:   Thu, 11 Aug 2022 14:24:35 -0700
Message-Id: <20220811212435.273142-1-luiz.dentz@gmail.com>
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From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

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

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
---
 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 6de2ad730995..74a0cd5d0b37 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -5549,17 +5549,21 @@ 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.
-- 
2.37.1