From patchwork Thu May 12 22:31:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luiz Augusto von Dentz X-Patchwork-Id: 571886 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 70474C4332F for ; Thu, 12 May 2022 22:31:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1359151AbiELWbk (ORCPT ); Thu, 12 May 2022 18:31:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55756 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1356208AbiELWbi (ORCPT ); Thu, 12 May 2022 18:31:38 -0400 Received: from mail-pf1-x429.google.com (mail-pf1-x429.google.com [IPv6:2607:f8b0:4864:20::429]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 98D0B57152 for ; Thu, 12 May 2022 15:31:37 -0700 (PDT) Received: by mail-pf1-x429.google.com with SMTP id p8so6053044pfh.8 for ; Thu, 12 May 2022 15:31:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=0dSEvmtlIR9K4VicMPCeEGlquhAdRH/Yf16cRkI0vts=; b=UbAGRDMikzKuuvHh/s3lpoXBPmIqcOR9gCMgFjtTaiVdloSYmFkw+YCdmxoUiuek/9 N1JQ5QvGEG402NAbsaZpbfdncbHkqVsf2nlVzpt8dK9vCi5bmcmQkhgii6xKviRlIVPd ZhhMLNeoYD2yrK0rGH1ELFaxDE9msHXYSVwzHZTntJu4GbE8EdQ775pJvPzcJbI1Bbyz +EowmjGuZ8kswJuo8I1e1t0rYTwI/vTVGl/lm18lDKuX/hOY9rSugsxQ4bBoV2JN3BIH 3IKaTZ/B3LuzWcL8NYMsieiuCwmD67OHtSxnZne2rn5tZuKluEEYjbemAJqpaqpyjhly iprQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=0dSEvmtlIR9K4VicMPCeEGlquhAdRH/Yf16cRkI0vts=; b=XqOhf1zONmXwqQMLRgboBADqZQ4aK+h+cUT/cXE7CpuzhmpnFumKXXQLns7t885j/B V24KUbf5ory+DxfsEUC7bwyFfzF0EtK5apo7EdrCNKDIWgrUAxzN8L3R+jBxmFN0QblQ Vv8VWzMUfnyBLhEgfu1VV7Y07gjgkyjDH9kAC+XXogA2jtcbJ01C5MhApd0np8rI+f1+ A616mX6Pd/AV3dn2Wd/aSQ90bRViFv9UQ3Unj57lwaQy6BcXrrxzcaC4ITVdthlYr8sb e25shX9zTpNUJGTCK9Q6R4N5T7rRcqvx8VMNqpx8jNgTHNiRHSGlGJmHKQdgayrFNucO sTwQ== X-Gm-Message-State: AOAM530nvfF3FNruN0yx60QhmgXazusmGvVdlh3VMNdV8X6qjQYSZ39o BfRRKiMdF+ukfWPAmPLylBK/nZYS2TY= X-Google-Smtp-Source: ABdhPJy9hWTw19Sfhzl3lNwSvrJCrQ+pYuCGLu1BenDeYlBn5gjlt2FPgQ0vBe/dJjxiOnEHZRvKCA== X-Received: by 2002:aa7:9852:0:b0:50d:6d10:2094 with SMTP id n18-20020aa79852000000b0050d6d102094mr1532938pfq.4.1652394696792; Thu, 12 May 2022 15:31:36 -0700 (PDT) Received: from lvondent-mobl4.. (c-71-56-157-77.hsd1.or.comcast.net. [71.56.157.77]) by smtp.gmail.com with ESMTPSA id x5-20020a623105000000b0050dc76281fdsm289843pfx.215.2022.05.12.15.31.35 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 May 2022 15:31:36 -0700 (PDT) From: Luiz Augusto von Dentz To: linux-bluetooth@vger.kernel.org Subject: [PATCH v2 2/2] Bluetooth: hci_sync: Fix attempting to suspend with unfiltered passive scan Date: Thu, 12 May 2022 15:31:34 -0700 Message-Id: <20220512223134.1021074-2-luiz.dentz@gmail.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220512223134.1021074-1-luiz.dentz@gmail.com> References: <20220512223134.1021074-1-luiz.dentz@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org From: Luiz Augusto von Dentz When suspending the passive scanning _must_ have its filter_policy set to 0x01 to use the accept list otherwise _any_ advertise report would end up waking up the system. In order to fix the filter_policy the code now checks for hdev->suspended && HCI_CONN_FLAG_REMOTE_WAKEUP first, since the MGMT_OP_SET_DEVICE_FLAGS will reject any attempt to set HCI_CONN_FLAG_REMOTE_WAKEUP when it cannot be programmed in the acceptlist, so it can return success causing the proper filter_policy to be used. Link: https://bugzilla.kernel.org/show_bug.cgi?id=215768 Signed-off-by: Luiz Augusto von Dentz --- net/bluetooth/hci_sync.c | 58 +++++++++++++++++++++++++++++----------- 1 file changed, 43 insertions(+), 15 deletions(-) diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c index 7bdfdc6a91f5..0fa013816a9b 100644 --- a/net/bluetooth/hci_sync.c +++ b/net/bluetooth/hci_sync.c @@ -1664,20 +1664,19 @@ static int hci_le_add_accept_list_sync(struct hci_dev *hdev, struct hci_cp_le_add_to_accept_list cp; int err; + /* During suspend, only wakeable devices can be in acceptlist */ + if (hdev->suspended && + !test_bit(HCI_CONN_FLAG_REMOTE_WAKEUP, params->flags)) + return 0; + /* Select filter policy to accept all advertising */ if (*num_entries >= hdev->le_accept_list_size) return -ENOSPC; /* Accept list can not be used with RPAs */ if (!use_ll_privacy(hdev) && - hci_find_irk_by_addr(hdev, ¶ms->addr, params->addr_type)) { + hci_find_irk_by_addr(hdev, ¶ms->addr, params->addr_type)) return -EINVAL; - } - - /* During suspend, only wakeable devices can be in acceptlist */ - if (hdev->suspended && - !test_bit(HCI_CONN_FLAG_REMOTE_WAKEUP, params->flags)) - return 0; /* Attempt to program the device in the resolving list first to avoid * having to rollback in case it fails since the resolving list is @@ -4940,10 +4939,28 @@ static int hci_update_event_filter_sync(struct hci_dev *hdev) return 0; } +/* This function disables scan (BR and LE) and mark it as paused */ +static int hci_pause_scan_sync(struct hci_dev *hdev) +{ + if (hdev->scanning_paused) + return 0; + + /* Disable page scan if enabled */ + if (test_bit(HCI_PSCAN, &hdev->flags)) + hci_write_scan_enable_sync(hdev, SCAN_DISABLED); + + hci_scan_disable_sync(hdev); + + hdev->scanning_paused = true; + + return 0; +} + /* This function performs the HCI suspend procedures in the follow order: * * Pause discovery (active scanning/inquiry) * Pause Directed Advertising/Advertising + * Pause Scanning (passive scanning in case discovery was not active) * Disconnect all connections * Set suspend_status to BT_SUSPEND_DISCONNECT if hdev cannot wakeup * otherwise: @@ -4969,15 +4986,11 @@ int hci_suspend_sync(struct hci_dev *hdev) /* Pause other advertisements */ hci_pause_advertising_sync(hdev); - /* Disable page scan if enabled */ - if (test_bit(HCI_PSCAN, &hdev->flags)) - hci_write_scan_enable_sync(hdev, SCAN_DISABLED); - /* Suspend monitor filters */ hci_suspend_monitor_sync(hdev); /* Prevent disconnects from causing scanning to be re-enabled */ - hdev->scanning_paused = true; + hci_pause_scan_sync(hdev); /* Soft disconnect everything (power off) */ err = hci_disconnect_all_sync(hdev, HCI_ERROR_REMOTE_POWER_OFF); @@ -5048,6 +5061,22 @@ static void hci_resume_monitor_sync(struct hci_dev *hdev) } } +/* This function resume scan and reset paused flag */ +static int hci_resume_scan_sync(struct hci_dev *hdev) +{ + if (!hdev->scanning_paused) + return 0; + + hci_update_scan_sync(hdev); + + /* Reset passive scanning to normal */ + hci_update_passive_scan_sync(hdev); + + hdev->scanning_paused = false; + + return 0; +} + /* This function performs the HCI suspend procedures in the follow order: * * Restore event mask @@ -5070,10 +5099,9 @@ int hci_resume_sync(struct hci_dev *hdev) /* Clear any event filters and restore scan state */ hci_clear_event_filter_sync(hdev); - hci_update_scan_sync(hdev); - /* Reset passive scanning to normal */ - hci_update_passive_scan_sync(hdev); + /* Resume scanning */ + hci_resume_scan_sync(hdev); /* Resume monitor filters */ hci_resume_monitor_sync(hdev);