linux-kernel - [BlueZ PATCH] Bluetooth: hci_core: Skip hci_cmd_work if hci

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Message-ID: <20240214012328.BlueZ.1.I10eda6f375bc8dfedf4eef3a8cf6572c65803afc@changeid>
Date: Wed, 14 Feb 2024 01:23:29 +0800
From: Hsin-chen Chuang <chharry@...omium.org>
To: linux-bluetooth@...r.kernel.org
Cc: chromeos-bluetooth-upstreaming@...omium.org,
	Hsin-chen Chuang <chharry@...omium.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	Luiz Augusto von Dentz <luiz.dentz@...il.com>,
	Marcel Holtmann <marcel@...tmann.org>,
	linux-kernel@...r.kernel.org
Subject: [BlueZ PATCH] Bluetooth: hci_core: Skip hci_cmd_work if hci_request is pending

hci_cmd_work overwrites the hdev->sent_cmd which contains the required
info for a hci_request to work. In the real world, it's observed that
a request from hci_le_ext_create_conn_sync could be interrupted by
the authentication (hci_conn_auth) caused by rfcomm_sock_connect. When
it happends, hci_le_ext_create_conn_sync hangs until timeout; If the
LE connection is triggered by MGMT, it freezes the whole MGMT interface.

Signed-off-by: Hsin-chen Chuang <chharry@...omium.org>
---

 net/bluetooth/hci_core.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 34c8dca2069f..e3706889976d 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -4213,8 +4213,11 @@ static void hci_cmd_work(struct work_struct *work)
 	BT_DBG("%s cmd_cnt %d cmd queued %d", hdev->name,
 	       atomic_read(&hdev->cmd_cnt), skb_queue_len(&hdev->cmd_q));
 
-	/* Send queued commands */
-	if (atomic_read(&hdev->cmd_cnt)) {
+	/* Send queued commands. Don't send the command when there is a pending
+	 * hci_request because the request callbacks would be overwritten.
+	 */
+	if (atomic_read(&hdev->cmd_cnt) &&
+	    !hci_dev_test_flag(hdev, HCI_CMD_PENDING)) {
 		skb = skb_dequeue(&hdev->cmd_q);
 		if (!skb)
 			return;
-- 
2.43.0.687.g38aa6559b0-goog