linux-kernel - [kernel PATCH v2 1/1] Bluetooth: hci_sync: allow advertise when scan without RPA

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Message-ID: <20220913163710.kernel.v2.1.I54824fdfb8de716a1d7d9eccecbbfb6e45b116a8@changeid>
Date:   Tue, 13 Sep 2022 16:37:15 -0700
From:   Zhengping Jiang <jiangzp@...gle.com>
To:     linux-bluetooth@...r.kernel.org, marcel@...tmann.org
Cc:     Zhengping Jiang <jiangzp@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [kernel PATCH v2 1/1] Bluetooth: hci_sync: allow advertise when scan
 without RPA

Address resolution will be paused during active scan to allow any
advertising reports reach the host. If LL privacy is enabled,
advertising will rely on the controller to generate new RPA.

If host is not using RPA, there is no need to stop advertising during
active scan because there is no need to generate RPA in the controller.

Signed-off-by: Zhengping Jiang <jiangzp@...gle.com>
---

Changes in v2:
- Modify title to reduce length within limit

Changes in v1:
- Check privacy flag when disable advertising

 net/bluetooth/hci_sync.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
index 41b6d19c70b06..422f7c6911d9f 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -5351,7 +5351,7 @@ static int hci_active_scan_sync(struct hci_dev *hdev, uint16_t interval)
 	/* Pause advertising since active scanning disables address resolution
 	 * which advertising depend on in order to generate its RPAs.
 	 */
-	if (use_ll_privacy(hdev)) {
+	if (use_ll_privacy(hdev) && hci_dev_test_flag(hdev, HCI_PRIVACY)) {
 		err = hci_pause_advertising_sync(hdev);
 		if (err) {
 			bt_dev_err(hdev, "pause advertising failed: %d", err);
-- 
2.37.2.789.g6183377224-goog