Merge tag 'for-net-2024-07-26' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth

Luiz Augusto von Dentz says:

====================
bluetooth pull request for net:

 - btmtk: Fix kernel crash when entering btmtk_usb_suspend
 - btmtk: Fix btmtk.c undefined reference build error
 - btintel: Fail setup on error
 - hci_sync: Fix suspending with wrong filter policy
 - hci_event: Fix setting DISCOVERY_FINDING for passive scanning

* tag 'for-net-2024-07-26' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth:
  Bluetooth: hci_event: Fix setting DISCOVERY_FINDING for passive scanning
  Bluetooth: btmtk: remove #ifdef around declarations
  Bluetooth: btmtk: Fix btmtk.c undefined reference build error harder
  Bluetooth: btmtk: Fix btmtk.c undefined reference build error
  Bluetooth: hci_sync: Fix suspending with wrong filter policy
  Bluetooth: btmtk: Fix kernel crash when entering btmtk_usb_suspend
  Bluetooth: btintel: Fail setup on error
====================

Link: https://patch.msgid.link/20240726150502.3300832-1-luiz.dentz@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

3 files changed, 24 insertions, 9 deletions

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 8a4ebd93adfc..06da8ac13dca 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -119,13 +119,6 @@ void hci_discovery_set_state(struct hci_dev *hdev, int state)
 	case DISCOVERY_STARTING:
 		break;
 	case DISCOVERY_FINDING:
-		/* If discovery was not started then it was initiated by the
-		 * MGMT interface so no MGMT event shall be generated either
-		 */
-		if (old_state != DISCOVERY_STARTING) {
-			hdev->discovery.state = old_state;
-			return;
-		}
 		mgmt_discovering(hdev, 1);
 		break;
 	case DISCOVERY_RESOLVING:
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index dce8035ca799..d0c118c47f6c 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -1721,9 +1721,10 @@ static void le_set_scan_enable_complete(struct hci_dev *hdev, u8 enable)
 	switch (enable) {
 	case LE_SCAN_ENABLE:
 		hci_dev_set_flag(hdev, HCI_LE_SCAN);
-		if (hdev->le_scan_type == LE_SCAN_ACTIVE)
+		if (hdev->le_scan_type == LE_SCAN_ACTIVE) {
 			clear_pending_adv_report(hdev);
-		hci_discovery_set_state(hdev, DISCOVERY_FINDING);
+			hci_discovery_set_state(hdev, DISCOVERY_FINDING);
+		}
 		break;
 
 	case LE_SCAN_DISABLE:
diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
index cd2ed16da8a4..a31d39a821f4 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -2976,6 +2976,27 @@ static int hci_passive_scan_sync(struct hci_dev *hdev)
 	 */
 	filter_policy = hci_update_accept_list_sync(hdev);
 
+	/* If suspended and filter_policy set to 0x00 (no acceptlist) then
+	 * passive scanning cannot be started since that would require the host
+	 * to be woken up to process the reports.
+	 */
+	if (hdev->suspended && !filter_policy) {
+		/* Check if accept list is empty then there is no need to scan
+		 * while suspended.
+		 */
+		if (list_empty(&hdev->le_accept_list))
+			return 0;
+
+		/* If there are devices is the accept_list that means some
+		 * devices could not be programmed which in non-suspended case
+		 * means filter_policy needs to be set to 0x00 so the host needs
+		 * to filter, but since this is treating suspended case we
+		 * can ignore device needing host to filter to allow devices in
+		 * the acceptlist to be able to wakeup the system.
+		 */
+		filter_policy = 0x01;
+	}
+
 	/* When the controller is using random resolvable addresses and
 	 * with that having LE privacy enabled, then controllers with
 	 * Extended Scanner Filter Policies support can now enable support