linux-kernel - [PATCH v2 2/3] Bluetooth: Always allow SCO packets for user channel

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Message-ID: <20250122131925.v2.2.I6e9e94dcded65e4a9ed42ad23ca8a5d81f680382@changeid>
Date: Wed, 22 Jan 2025 13:19:26 +0800
From: Hsin-chen Chuang <chharry@...gle.com>
To: linux-bluetooth@...r.kernel.org, luiz.dentz@...il.com
Cc: chromeos-bluetooth-upstreaming@...omium.org, 
	Hsin-chen Chuang <chharry@...omium.org>, Marcel Holtmann <marcel@...tmann.org>, 
	Ying Hsu <yinghsu@...omium.org>, linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/3] Bluetooth: Always allow SCO packets for user channel

From: Hsin-chen Chuang <chharry@...omium.org>

The SCO packets from Bluetooth raw socket are now rejected because
hci_conn_num is left 0. This patch allows such the usecase to enable
the userspace SCO support.

Fixes: b16b327edb4d ("Bluetooth: btusb: add sysfs attribute to control USB alt setting")
Signed-off-by: Hsin-chen Chuang <chharry@...omium.org>
---

Changes in v2:
- Check HCI_USER_CHANNEL rather than just remove the hci_conn_num check

 drivers/bluetooth/btusb.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index bf210275e5b7..acfa83228b25 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -2104,7 +2104,8 @@ static int btusb_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
 		return submit_or_queue_tx_urb(hdev, urb);
 
 	case HCI_SCODATA_PKT:
-		if (hci_conn_num(hdev, SCO_LINK) < 1)
+		if (!hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
+		    hci_conn_num(hdev, SCO_LINK) < 1)
 			return -ENODEV;
 
 		urb = alloc_isoc_urb(hdev, skb);
@@ -2585,7 +2586,8 @@ static int btusb_send_frame_intel(struct hci_dev *hdev, struct sk_buff *skb)
 		return submit_or_queue_tx_urb(hdev, urb);
 
 	case HCI_SCODATA_PKT:
-		if (hci_conn_num(hdev, SCO_LINK) < 1)
+		if (!hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
+		    hci_conn_num(hdev, SCO_LINK) < 1)
 			return -ENODEV;
 
 		urb = alloc_isoc_urb(hdev, skb);
-- 
2.48.1.262.g85cc9f2d1e-goog