From patchwork Thu Nov 11 05:20:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Archie Pusaka X-Patchwork-Id: 12614191 X-Patchwork-Delegate: marcel@holtmann.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 56C25C433EF for ; Thu, 11 Nov 2021 05:21:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 30FA6613B3 for ; Thu, 11 Nov 2021 05:21:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232955AbhKKFXy (ORCPT ); Thu, 11 Nov 2021 00:23:54 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46246 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229463AbhKKFXw (ORCPT ); Thu, 11 Nov 2021 00:23:52 -0500 Received: from mail-qv1-xf49.google.com (mail-qv1-xf49.google.com [IPv6:2607:f8b0:4864:20::f49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A0975C0613F5 for ; Wed, 10 Nov 2021 21:21:03 -0800 (PST) Received: by mail-qv1-xf49.google.com with SMTP id j9-20020a05621419c900b003b815c01a54so4668188qvc.10 for ; Wed, 10 Nov 2021 21:21:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:message-id:mime-version:subject:from:to:cc; bh=4QGK+gsnB0i8v51ZJlvJzgAW5exC56xFsYJaAgqkcHM=; b=YG0KukbASgq1N77esyIQ9HWrllIl06n6PBi+UPAkNh8JQHAfOe7yu2UomP7G8Qn9F6 6TkhSle1byBGFj4DoF6Gjw+pTixFhU65cuwPg1akViLjnoHGXvNy/kuDZWD5peMFDQVw ZbwVFPEC4EI204FZUUbQbf+2wkT1tDQ0aeUdRiPykNexXQpuZj6oHT5/cshGRNbRzXKi TlS6uBbeRUrCNpTygo2KnCg8QyarBy75QfdgsTO0ZkBtjEgU6CTEurd/4p38PcPsLpkR pq4wxRsrzBKZ5XYrLXhlmTuzsMDImnHuhInUQokQm6n/h+Duh8VYviVDrsKdgnkMljJK xbRQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc; bh=4QGK+gsnB0i8v51ZJlvJzgAW5exC56xFsYJaAgqkcHM=; b=1YUdeDMAcYFGn7aFyMdzySRr8pUznppRuZ8YDWVy688JytCuD6wIi1KF6ov3PFQpyO uUdw7Zchr2NfDD0IZ+Th9yQQ2gRpMt0RA/9VgmCryfGmbENP6vrgHWRI6T5D9B3QjoIl 9wdMLwUdAjEyXK7Mn43h/C3t0PTMfjL4JuuWG0kbt62ltGswTLPd/e8ev26ZYmKcu0AX vS8TECBl53U2Q7FOV6jxPdAfej6bnAgi3TkhGrZdpjcipfWXyr+FzQrQQpmoutlkUXPR Ji93k2yRXznDdlOiQAx4s9x+1Y50gLjFJrr/8oohw8Bcx9PqjqdF78XskgqW+IzevVVx QyZg== X-Gm-Message-State: AOAM530L7J7uJEw4/OxSMahPDkfru3fpstRHkuAe2jgfSyyxpRsyS9/z 4Tm3jBEYhjL5zP4NEauzAazEmZ3x/NeCcB0XDPa65GTUSBUgQuDsCoxnaDkWa+Dk+CTmVrFnvCG SDIBnpl7gPlMIpWYTAJ55pav3KIUVp7mIWzzb1McKkZfsyGKpUNYXi4dyM/WOSM5v0b9RMYgZmi 7+ X-Google-Smtp-Source: ABdhPJxDHD1UOlNrc/Jl27bTgfN5RjcdbjW+C10h/DM/s2OxoJ90atmHrfalsaaQG783G4xuKl4hNic6mZZx X-Received: from apusaka-p920.tpe.corp.google.com ([2401:fa00:1:10:b87e:3eb:e17e:1273]) (user=apusaka job=sendgmr) by 2002:ac8:7e91:: with SMTP id w17mr5032950qtj.191.1636608062561; Wed, 10 Nov 2021 21:21:02 -0800 (PST) Date: Thu, 11 Nov 2021 13:20:53 +0800 Message-Id: <20211111132045.v3.1.I3ba1a76d72da5a813cf6e6f219838c9ef28c5eaa@changeid> Mime-Version: 1.0 X-Mailer: git-send-email 2.34.0.rc0.344.g81b53c2807-goog Subject: [PATCH v3 1/2] Bluetooth: Ignore HCI_ERROR_CANCELLED_BY_HOST on adv set terminated event From: Archie Pusaka To: linux-bluetooth , Marcel Holtmann Cc: CrosBT Upstreaming , Archie Pusaka , "David S. Miller" , Jakub Kicinski , Johan Hedberg , Luiz Augusto von Dentz , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org From: Archie Pusaka This event is received when the controller stops advertising, specifically for these three reasons: (a) Connection is successfully created (success). (b) Timeout is reached (error). (c) Number of advertising events is reached (error). (*) This event is NOT generated when the host stops the advertisement. Refer to the BT spec ver 5.3 vol 4 part E sec 7.7.65.18. Note that the section was revised from BT spec ver 5.0 vol 2 part E sec 7.7.65.18 which was ambiguous about (*). Some chips (e.g. RTL8822CE) send this event when the host stops the advertisement with status = HCI_ERROR_CANCELLED_BY_HOST (due to (*) above). This is treated as an error and the advertisement will be removed and userspace will be informed via MGMT event. On suspend, we are supposed to temporarily disable advertisements, and continue advertising on resume. However, due to the behavior above, the advertisements are removed instead. This patch returns early if HCI_ERROR_CANCELLED_BY_HOST is received. Btmon snippet of the unexpected behavior: @ MGMT Command: Remove Advertising (0x003f) plen 1 Instance: 1 < HCI Command: LE Set Extended Advertising Enable (0x08|0x0039) plen 6 Extended advertising: Disabled (0x00) Number of sets: 1 (0x01) Entry 0 Handle: 0x01 Duration: 0 ms (0x00) Max ext adv events: 0 > HCI Event: LE Meta Event (0x3e) plen 6 LE Advertising Set Terminated (0x12) Status: Operation Cancelled by Host (0x44) Handle: 1 Connection handle: 0 Number of completed extended advertising events: 5 > HCI Event: Command Complete (0x0e) plen 4 LE Set Extended Advertising Enable (0x08|0x0039) ncmd 2 Status: Success (0x00) Signed-off-by: Archie Pusaka --- (no changes since v2) Changes in v2: * Split clearing HCI_LE_ADV into its own patch * Reword comments include/net/bluetooth/hci.h | 1 + net/bluetooth/hci_event.c | 12 ++++++++++++ 2 files changed, 13 insertions(+) diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h index 63065bc01b76..84db6b275231 100644 --- a/include/net/bluetooth/hci.h +++ b/include/net/bluetooth/hci.h @@ -566,6 +566,7 @@ enum { #define HCI_ERROR_INVALID_LL_PARAMS 0x1e #define HCI_ERROR_UNSPECIFIED 0x1f #define HCI_ERROR_ADVERTISING_TIMEOUT 0x3c +#define HCI_ERROR_CANCELLED_BY_HOST 0x44 /* Flow control modes */ #define HCI_FLOW_CTL_MODE_PACKET_BASED 0x00 diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c index d4b75a6cfeee..7d875927c48b 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -5538,6 +5538,18 @@ static void hci_le_ext_adv_term_evt(struct hci_dev *hdev, struct sk_buff *skb) adv = hci_find_adv_instance(hdev, ev->handle); + /* The Bluetooth Core 5.3 specification clearly states that this event + * shall not be sent when the Host disables the advertising set. So in + * case of HCI_ERROR_CANCELLED_BY_HOST, just ignore the event. + * + * When the Host disables an advertising set, all cleanup is done via + * its command callback and not needed to be duplicated here. + */ + if (ev->status == HCI_ERROR_CANCELLED_BY_HOST) { + bt_dev_warn_ratelimited(hdev, "Unexpected advertising set terminated event"); + return; + } + if (ev->status) { if (!adv) return;