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Bluetooth: btusb: Reclassify Qualcomm WCN6855 debug packets

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Some Qualcomm Bluetooth controllers, e.g., QCNFA765 with WCN6855
chip, send debug packets as ACL frames with header 0x2EDC.
The kernel misinterprets these as malformed ACL packets, causing
repeated errors:

  Bluetooth: hci0: ACL packet for unknown connection handle 3804

This can occur hundreds of times per minute, greatly cluttering logs.
On my computer, I am observing approximately 7 messages per second
when streaming audio to a speaker.

For Qualcomm controllers exchanging over UART, hci_qca.c already
filters out these debug packets. This patch is for controllers
not going through UART, but USB.

This patch uses the classify_pkt_type callback to reclassify the
packets with handle 0x2EDC as HCI_DIAG_PKT before they reach the
HCI layer. This change is only applied to Qualcomm devices marked
as BTUSB_QCA_WCN6855.

Tested on: Thinkpad T14 gen2 (AMD) with QCNFA765 (0489:E0D0)
Signed-off-by: Pascal Giard <pascal.giard@etsmtl.ca>
Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Pascal Giard
2025-10-07 11:33:15 -04:00
committed by Luiz Augusto von Dentz
parent 8dbbb5423c
commit 0b00bee940
1 changed files with 19 additions and 0 deletions
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19
drivers/bluetooth/btusb.c
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@@ -1137,6 +1137,24 @@ static void btusb_qca_reset(struct hci_dev *hdev)
btusb_reset(hdev);
}
static u8 btusb_classify_qca_pkt_type(struct hci_dev *hdev, struct sk_buff *skb)
{
/* Some Qualcomm controllers, e.g., QCNFA765 with WCN6855 chip, send debug
* packets as ACL frames with connection handle 0x2EDC. These are not real
* ACL packets and should be reclassified as HCI_DIAG_PKT to prevent
* "ACL packet for unknown connection handle 3804" errors.
*/
if (skb->len >= 2) {
u16 handle = get_unaligned_le16(skb->data);
if (handle == 0x2EDC)
return HCI_DIAG_PKT;
}
/* Use default packet type for other packets */
return hci_skb_pkt_type(skb);
}
static inline void btusb_free_frags(struct btusb_data *data)
{
unsigned long flags;
@@ -4245,6 +4263,7 @@ static int btusb_probe(struct usb_interface *intf,
data->recv_acl = btusb_recv_acl_qca;
hci_devcd_register(hdev, btusb_coredump_qca, btusb_dump_hdr_qca, NULL);
data->setup_on_usb = btusb_setup_qca;
hdev->classify_pkt_type = btusb_classify_qca_pkt_type;
hdev->shutdown = btusb_shutdown_qca;
hdev->set_bdaddr = btusb_set_bdaddr_wcn6855;
hdev->reset = btusb_qca_reset;