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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20260107024820.1722270-1-lilinmao@kylinos.cn>
Date: Wed,  7 Jan 2026 10:48:20 +0800
From: Linmao Li <lilinmao@...inos.cn>
To: linux-bluetooth@...r.kernel.org
Cc: marcel@...tmann.org,
	luiz.dentz@...il.com,
	linux-kernel@...r.kernel.org,
	Linmao Li <lilinmao@...inos.cn>
Subject: [PATCH] Bluetooth: btusb: Reject autosuspend if HCI inquiry or LE scan is active

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@...inos.cn>
---
 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