[PATCH] Bluetooth: btusb: Reject autosuspend if HCI inquiry or LE scan is active

[Linmao Li]

If USB autosuspend occurs while BR/EDR inquiry or LE scan is active,
the ongoing HCI operation may not complete successfully. On some
devices, this can leave discovery.state stuck in DISCOVERY_FINDING.

Signed-off-by: Linmao Li <lilinmao@xxxxxxxxxx>
---
 drivers/bluetooth/btusb.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index ded09e94d296..885c3d8c0a10 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -4469,10 +4469,13 @@ static int btusb_suspend(struct usb_interface *intf, pm_message_t message)
 
 	BT_DBG("intf %p", intf);
 
-	/* Don't auto-suspend if there are connections; external suspend calls
-	 * shall never fail.
+	/* Don't auto-suspend if there are connections or HCI operations in
+	 * progress; external suspend calls shall never fail.
 	 */
-	if (PMSG_IS_AUTO(message) && hci_conn_count(data->hdev))
+	if (PMSG_IS_AUTO(message) &&
+	    (hci_conn_count(data->hdev) ||
+	    test_bit(HCI_INQUIRY, &data->hdev->flags) ||
+	    hci_dev_test_flag(data->hdev, HCI_LE_SCAN)))
 		return -EBUSY;
 
 	if (data->suspend_count++)
-- 
2.25.1