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Bluetooth: btmtk: add event filter to filter specific event

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Add an event filter to filter event with specific opcode to prevent BT
stack from receiving unexpected event.

Event with opcode 0xfc5d is generated when MediaTek's Bluetooth enable
firmware logs and is not expected to be sent to userspace.

Signed-off-by: Chris Lu <chris.lu@mediatek.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Chris Lu 2026-04-16 19:16:07 +08:00 committed by Luiz Augusto von Dentz
parent 69b2f05df3
commit 47f4bf27eb
3 changed files with 31 additions and 0 deletions
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23
drivers/bluetooth/btmtk.c
View File

@ -1547,6 +1547,29 @@ int btmtk_usb_shutdown(struct hci_dev *hdev)
return 0;
}
EXPORT_SYMBOL_GPL(btmtk_usb_shutdown);
int btmtk_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
{
struct hci_event_hdr *hdr = (void *)skb->data;
struct hci_ev_cmd_complete *ec;
if (hdr->evt == HCI_EV_CMD_COMPLETE &&
skb->len >= HCI_EVENT_HDR_SIZE + sizeof(*ec)) {
u16 opcode;
ec = (void *)(skb->data + HCI_EVENT_HDR_SIZE);
opcode = __le16_to_cpu(ec->opcode);
/* Filter vendor opcode */
if (opcode == 0xfc5d) {
kfree_skb(skb);
return 0;
}
}
return hci_recv_frame(hdev, skb);
}
EXPORT_SYMBOL_GPL(btmtk_recv_event);
#endif
MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>");

7
drivers/bluetooth/btmtk.h
View File

@ -220,6 +220,8 @@ int btmtk_usb_suspend(struct hci_dev *hdev);
int btmtk_usb_setup(struct hci_dev *hdev);
int btmtk_usb_shutdown(struct hci_dev *hdev);
int btmtk_recv_event(struct hci_dev *hdev, struct sk_buff *skb);
#else
static inline int btmtk_set_bdaddr(struct hci_dev *hdev,
@ -299,4 +301,9 @@ static inline int btmtk_usb_shutdown(struct hci_dev *hdev)
{
return -EOPNOTSUPP;
}
static inline int btmtk_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
{
return hci_recv_frame(hdev, skb);
}
#endif

1
drivers/bluetooth/btusb.c
View File

@ -4252,6 +4252,7 @@ static int btusb_probe(struct usb_interface *intf,
hci_set_quirk(hdev, HCI_QUIRK_BROKEN_ENHANCED_SETUP_SYNC_CONN);
hci_set_quirk(hdev, HCI_QUIRK_NON_PERSISTENT_SETUP);
data->recv_acl = btmtk_usb_recv_acl;
data->recv_event = btmtk_recv_event;
data->suspend = btmtk_usb_suspend;
data->resume = btmtk_usb_resume;
data->disconnect = btusb_mtk_disconnect;