On Wed, Apr 02, 2025 at 04:15:26AM -0400, Sean Rhodes wrote:

...

From ccabbdd36dacc3e03ed819b4b050ebcc1978e311 Mon Sep 17 00:00:00 2001

From: Sean Rhodes sean@starlabs.systems Date: Wed, 2 Apr 2025 09:05:17 +0100 Subject: [PATCH] Bluetooth: Revert vendor-specific ISO classification for non-offload cards

This reverts commit f25b7fd36cc3a850e006aed686f5bbecd200de1b.

The commit introduces vendor-specific classification of ISO data, but breaks Bluetooth functionality on certain Intel cards that do not support audio offload, such as the 9462. Affected devices are unable to discover new Bluetooth peripherals, and previously paired devices fail to reconnect.

This issue does not affect newer cards (e.g., AX201+) that support audio offload. A conditional check using AOLD() could be used in the future to reintroduce this behavior only on supported hardware.

Cc: Ying Hsu yinghsu@chromium.org Cc: Luiz Augusto von Dentz luiz.von.dentz@intel.com Cc: stable@vger.kernel.org Signed-off-by: Sean Rhodes sean@starlabs.systems

---

drivers/bluetooth/btintel.c | 7 ++----- include/net/bluetooth/hci_core.h | 1 - net/bluetooth/hci_core.c | 16 ---------------- 3 files changed, 2 insertions(+), 22 deletions(-)

diff --git a/drivers/bluetooth/btintel.c b/drivers/bluetooth/btintel.c index 48e2f400957b..2114fe8d527e 100644 --- a/drivers/bluetooth/btintel.c +++ b/drivers/bluetooth/btintel.c @@ -3588,15 +3588,12 @@ static int btintel_setup_combined(struct hci_dev *hdev) err = btintel_bootloader_setup(hdev, &ver); btintel_register_devcoredump_support(hdev); break;

• case 0x18: /* GfP2 */
• case 0x1c: /* GaP */

• /* Re-classify packet type for controllers with LE audio */
  

• hdev->classify_pkt_type = btintel_classify_pkt_type;
  

• fallthrough;
  

  case 0x17:

• case 0x18: case 0x19: case 0x1b: case 0x1d:
• case 0x1c: case 0x1e: case 0x1f: /* Display version information of TLV type */

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h index 5115da34f881..d1a4436e4cc3 100644 --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -646,7 +646,6 @@ struct hci_dev { int (*get_codec_config_data)(struct hci_dev *hdev, __u8 type, struct bt_codec *codec, __u8 *vnd_len, __u8 **vnd_data);

• u8 (*classify_pkt_type)(struct hci_dev *hdev, struct sk_buff *skb);

};

#define HCI_PHY_HANDLE(handle) (handle & 0xff) diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index 5eb0600bbd03..5b7515703ad1 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -2868,31 +2868,15 @@ int hci_reset_dev(struct hci_dev *hdev) } EXPORT_SYMBOL(hci_reset_dev);

-static u8 hci_dev_classify_pkt_type(struct hci_dev *hdev, struct sk_buff *skb) -{

• if (hdev->classify_pkt_type)

• return hdev->classify_pkt_type(hdev, skb);
  

• return hci_skb_pkt_type(skb);

-}

/* Receive frame from HCI drivers */ int hci_recv_frame(struct hci_dev *hdev, struct sk_buff *skb) {

• u8 dev_pkt_type;

• if (!hdev || (!test_bit(HCI_UP, &hdev->flags) && !test_bit(HCI_INIT, &hdev->flags))) { kfree_skb(skb); return -ENXIO; }

• /* Check if the driver agree with packet type classification */

• dev_pkt_type = hci_dev_classify_pkt_type(hdev, skb);

• if (hci_skb_pkt_type(skb) != dev_pkt_type) {

• hci_skb_pkt_type(skb) = dev_pkt_type;
  

• }

• switch (hci_skb_pkt_type(skb)) { case HCI_EVENT_PKT: break;

-- 2.45.2

<formletter>

This is not the correct way to submit patches for inclusion in the stable kernel tree. Please read: https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html for how to do this properly.

</formletter>