[kernel PATCH v2] Bluetooth: hci_sync: Resume adv with no RPA when active scan

[kernel PATCH v2] Bluetooth: hci_sync: Resume adv with no RPA when active scan

[Zhengping Jiang]

The address resolution should be disabled during the active scan,
so all the advertisements can reach the host. The advertising
has to be paused before disabling the address resolution,
because the advertising will prevent any changes to the resolving
list and the address resolution status. Skipping this will cause
the hci error and the discovery failure.

If the host is using RPA, the controller needs to generate RPA for
the advertising, so the advertising must remain paused during the
active scan.

If the host is not using RPA, the advertising can be resumed after
disabling the address resolution.

Fixes: 9afc675edeeb ("Bluetooth: hci_sync: allow advertise when scan without RPA")
Signed-off-by: Zhengping Jiang <jiangzp@google.com>
---

Changes in v2:
- Commit message format

Changes in v1:
- With LL privacy, always pause advertising when active scan
- Only resume the advertising if the host is not using RPA

 net/bluetooth/hci_sync.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
index 117eedb6f709..edbf9faf7fa1 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -2402,7 +2402,7 @@ static u8 hci_update_accept_list_sync(struct hci_dev *hdev)
 	u8 filter_policy;
 	int err;
 
-	/* Pause advertising if resolving list can be used as controllers are
+	/* Pause advertising if resolving list can be used as controllers
 	 * cannot accept resolving list modifications while advertising.
 	 */
 	if (use_ll_privacy(hdev)) {
@@ -5397,7 +5397,7 @@ 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) && hci_dev_test_flag(hdev, HCI_PRIVACY)) {
+	if (use_ll_privacy(hdev)) {
 		err = hci_pause_advertising_sync(hdev);
 		if (err) {
 			bt_dev_err(hdev, "pause advertising failed: %d", err);
@@ -5416,6 +5416,10 @@ static int hci_active_scan_sync(struct hci_dev *hdev, uint16_t interval)
 		goto failed;
 	}
 
+	// Resume paused advertising if the host is not using RPA
+	if (use_ll_privacy(hdev) && !hci_dev_test_flag(hdev, HCI_PRIVACY))
+		hci_resume_advertising_sync(hdev);
+
 	/* All active scans will be done with either a resolvable private
 	 * address (when privacy feature has been enabled) or non-resolvable
 	 * private address.
-- 
2.39.1.581.gbfd45094c4-goog

RE: [kernel,v2] Bluetooth: hci_sync: Resume adv with no RPA when active scan

[bluez.test.bot]

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This is automated email and please do not reply to this email!

Dear submitter,

Thank you for submitting the patches to the linux bluetooth mailing list.
This is a CI test results with your patch series:
PW Link:https://patchwork.kernel.org/project/bluetooth/list/?series=721897

---Test result---

Test Summary:
CheckPatch                    PASS      0.60 seconds
GitLint                       PASS      0.26 seconds
SubjectPrefix                 PASS      0.06 seconds
BuildKernel                   PASS      39.06 seconds
CheckAllWarning               PASS      42.41 seconds
CheckSparse                   PASS      47.61 seconds
CheckSmatch                   PASS      129.51 seconds
BuildKernel32                 PASS      37.67 seconds
TestRunnerSetup               PASS      537.95 seconds
TestRunner_l2cap-tester       PASS      18.94 seconds
TestRunner_iso-tester         PASS      20.48 seconds
TestRunner_bnep-tester        PASS      6.82 seconds
TestRunner_mgmt-tester        PASS      130.43 seconds
TestRunner_rfcomm-tester      PASS      10.84 seconds
TestRunner_sco-tester         PASS      9.82 seconds
TestRunner_ioctl-tester       PASS      11.65 seconds
TestRunner_mesh-tester        PASS      8.92 seconds
TestRunner_smp-tester         PASS      9.60 seconds
TestRunner_userchan-tester    PASS      7.18 seconds
IncrementalBuild              PASS      35.28 seconds



---
Regards,
Linux Bluetooth