linux-kernel - [BlueZ PATCH 4/6] Bluetooth: Handle system suspend resume case

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Date:   Thu, 17 Sep 2020 13:29:41 +0800
From:   Howard Chung <howardchung@...gle.com>
To:     linux-bluetooth@...r.kernel.org
Cc:     mcchou@...omium.org, marcel@...tmann.org, mmandlik@...omium.org,
        howardchung@...gle.com, luiz.dentz@...il.com, alainm@...omium.org,
        Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [BlueZ PATCH 4/6] Bluetooth: Handle system suspend resume case

This patch adds code to handle the system suspension during interleave
scan. The interleave scan will be canceled when the system is going to
sleep, and will be restarted after waking up.

Signed-off-by: Howard Chung <howardchung@...gle.com>
Reviewed-by: Alain Michaud <alainm@...omium.org>
Reviewed-by: Manish Mandlik <mmandlik@...omium.org>
Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
Reviewed-by: Miao-chen Chou <mcchou@...omium.org>
---

 net/bluetooth/hci_request.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c
index 89443b48d90ce..d9082019b6386 100644
--- a/net/bluetooth/hci_request.c
+++ b/net/bluetooth/hci_request.c
@@ -1081,6 +1081,9 @@ void hci_req_add_le_passive_scan(struct hci_request *req)
 		filter_policy |= 0x02;
 
 	if (hdev->suspended) {
+		/* Block suspend notifier on response */
+		set_bit(SUSPEND_SCAN_ENABLE, hdev->suspend_tasks);
+
 		window = hdev->le_scan_window_suspend;
 		interval = hdev->le_scan_int_suspend;
 	} else if (hci_is_le_conn_scanning(hdev)) {
@@ -1167,10 +1170,8 @@ static void hci_req_config_le_suspend_scan(struct hci_request *req)
 		hci_req_add_le_scan_disable(req, false);
 
 	/* Configure params and enable scanning */
-	hci_req_add_le_passive_scan(req);
+	__hci_update_background_scan(req);
 
-	/* Block suspend notifier on response */
-	set_bit(SUSPEND_SCAN_ENABLE, req->hdev->suspend_tasks);
 }
 
 static void cancel_adv_timeout(struct hci_dev *hdev)
@@ -1282,8 +1283,10 @@ void hci_req_prepare_suspend(struct hci_dev *hdev, enum suspended_state next)
 		hci_req_add(&req, HCI_OP_WRITE_SCAN_ENABLE, 1, &page_scan);
 
 		/* Disable LE passive scan if enabled */
-		if (hci_dev_test_flag(hdev, HCI_LE_SCAN))
+		if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
+			cancel_interleave_scan(hdev);
 			hci_req_add_le_scan_disable(&req, false);
+		}
 
 		/* Mark task needing completion */
 		set_bit(SUSPEND_SCAN_DISABLE, hdev->suspend_tasks);
-- 
2.28.0.618.gf4bc123cb7-goog