From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailgw02.mediatek.com (unknown [210.61.82.184]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EBF9213B293; Thu, 16 Apr 2026 11:16:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=210.61.82.184 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776338180; cv=none; b=ehgGNEBQRTSB7EI7xnfFqt06aDEKUCt+KsGERKiGazzT/erAC/UUfpDEf3jewXfFjm5PFW/bbu5oK2ScJasR0ZPaopVtLBZEVZSECatF8NIgyf5VKzyTLr6qeA3+izDBIb2+IPKMocWM7P00VtsMO48MjYrrE2IfgqoLxj80hQE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776338180; c=relaxed/simple; bh=gLac2kv1ipKxZtsQg7ETG2l33PotuNKTYL+oTHbDGAA=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=lKbMy5fpWD4QlRe/XDclpR8+59zAWa8nA3+1WJ1nfm1YoFghTehe8cmU5VEZuCUZrGRajX6CKy7MHHcnOsZHP++M4L76In4URlrIeg491R1jY9K13AuzuB7YU2cX0xXt6kX6fBd5ad4Mg4aoXvL/UD8vu3sJQtsbzOVrDSX5EfQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mediatek.com; spf=pass smtp.mailfrom=mediatek.com; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b=FMyB72V7; arc=none smtp.client-ip=210.61.82.184 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mediatek.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mediatek.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="FMyB72V7" X-UUID: abe991b8398511f19a16598d5ca7f8ec-20260416 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:Content-Transfer-Encoding:MIME-Version:Message-ID:Date:Subject:CC:To:From; bh=DDEiQ/1U2BehaNl10ecngU1FU/rZtlw1/Sx2zRlAYJI=; b=FMyB72V7l6IUlCYSGOkVx8NEUpCtMBqUj/TlI6n0C4Bpx6QwLcYifsvZwwu1zZs9uICaAJyBd1FkEzAC7+FMPf65yF6bhPQxS6TP9aeur6i/ruGEh2KLHdLStIjuqT65/K7DBc43B62BggajIE1etfPxP4O8BBnGuej+cfRM8jU=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.12,REQID:0cc4d6cc-e31a-4ca9-9ae8-726060488ae4,IP:0,U RL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:0 X-CID-META: VersionHash:e7bac3a,CLOUDID:e4cd7f8f-6df4-4a3d-a7a4-fbdc42d669ce,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:102|836|865|888|898,TC:-5,Content:0| 15|50,EDM:-3,IP:nil,URL:0,File:130,RT:0,Bulk:nil,QS:nil,BEC:-1,COL:0,OSI:0 ,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: abe991b8398511f19a16598d5ca7f8ec-20260416 Received: from mtkmbs11n1.mediatek.inc [(172.21.101.185)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 837597535; Thu, 16 Apr 2026 19:16:10 +0800 Received: from mtkmbs11n1.mediatek.inc (172.21.101.185) by MTKMBS14N1.mediatek.inc (172.21.101.75) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.29; Thu, 16 Apr 2026 19:16:08 +0800 Received: from mtksitap99.mediatek.inc (10.233.130.16) by mtkmbs11n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.2562.29 via Frontend Transport; Thu, 16 Apr 2026 19:16:08 +0800 From: Chris Lu To: Marcel Holtmann , Johan Hedberg , Luiz Von Dentz CC: Sean Wang , Will Lee , SS Wu , Steve Lee , linux-bluetooth , linux-kernel , linux-mediatek , Chris Lu Subject: [PATCH v4] Bluetooth: btmtk: add event filter to filter specific event Date: Thu, 16 Apr 2026 19:16:07 +0800 Message-ID: <20260416111607.3161032-1-chris.lu@mediatek.com> X-Mailer: git-send-email 2.45.2 Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain 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 --- v1 -> v2 : update commit message v2 -> v3 : add boundary check in btmtk.c in btmtk_recv_event; keep using hci_recv_frame if CONFIG_BT_MTK wasn't defined in btmtk.h v3 -> v4 : change the assignment of btmtk_recv_event to avoid undefined reference. --- drivers/bluetooth/btmtk.c | 23 +++++++++++++++++++++++ drivers/bluetooth/btmtk.h | 7 +++++++ drivers/bluetooth/btusb.c | 1 + 3 files changed, 31 insertions(+) diff --git a/drivers/bluetooth/btmtk.c b/drivers/bluetooth/btmtk.c index 55516b4602db..78e84ecbbb91 100644 --- a/drivers/bluetooth/btmtk.c +++ b/drivers/bluetooth/btmtk.c @@ -1503,6 +1503,29 @@ 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 "); diff --git a/drivers/bluetooth/btmtk.h b/drivers/bluetooth/btmtk.h index adaf385626ee..c93652508f14 100644 --- a/drivers/bluetooth/btmtk.h +++ b/drivers/bluetooth/btmtk.h @@ -218,6 +218,8 @@ 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, @@ -296,4 +298,9 @@ 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 diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index f9d515ee9124..4ad5d466fcbe 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -4260,6 +4260,7 @@ 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; -- 2.45.2