From patchwork Tue Feb 25 00:00:36 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Abhishek Pandit-Subedi X-Patchwork-Id: 11402191 X-Patchwork-Delegate: marcel@holtmann.org Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 92F61138D for ; Tue, 25 Feb 2020 00:00:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6810F24672 for ; Tue, 25 Feb 2020 00:00:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="nrNCzO17" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728649AbgBYAA4 (ORCPT ); Mon, 24 Feb 2020 19:00:56 -0500 Received: from mail-pj1-f65.google.com ([209.85.216.65]:53290 "EHLO mail-pj1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728635AbgBYAAz (ORCPT ); Mon, 24 Feb 2020 19:00:55 -0500 Received: by mail-pj1-f65.google.com with SMTP id n96so456951pjc.3 for ; Mon, 24 Feb 2020 16:00:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=xHRY7WtQ/mTsM4blN4RvkEu7lSvJwYKGrcsPCUjqi1w=; b=nrNCzO17Ip6gwc/HJhU+z2ULsZYfZdYh52BwHIBofjhEaQsisKLQf+p4DpHb39Oz0A fslccTXzhPbffblSV+7qwYDEzFnRhDJ2UO8upFmFz8pebaVwFKlzX6/aNp/PQiCAIZuE LUNM5OwUt4WxcD1GG0/k1WkBhamtpYE+LX6OE= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=xHRY7WtQ/mTsM4blN4RvkEu7lSvJwYKGrcsPCUjqi1w=; b=RUObLQPqot4ajJZeiJ5CsXvPX1qS+j2PXZUiRgtEULmYZHTSL5hcPG8ZGav76zLDik dVgt9pSdOwqLQ42WWsQjHUvvenFfSNjSnZ+zFwbxvzk+AaWo72oL3gCOm/QjCcaEeTl0 kVAFICMRURYIW0fylOVmYwNuQ96QODpqdR3el2c0FDGs/az1W8DqxJMVE0rojmN9Ot8W VMubjZmQVtldy3zd+btN6Lb7RKLEVVYXj7gd3AI/0tzGPDGk+TJgf/OKHy1Oxu5MNWVJ 70vtaNuCR9WeT4RhMUbEbHCSVKmLErG3QsAOMcbfrxQKVSHF53RdeOK0leGUUZ/5pZ8P R8FQ== X-Gm-Message-State: APjAAAUtZSPgbz2kWcykV9Ze0qqKqGUUdmfNKnzkQoVU3DddYVv/Utkb hoDNGlGA1AE1WLnA4YgB3ZZdhg== X-Google-Smtp-Source: APXvYqyEo8nafOO4GtiPLOCcQTE8wcq6OhIY5ASSpLxQpulK8z0O3H5wWbZb8HqXzVnKaUSlYPIemw== X-Received: by 2002:a17:90a:8a98:: with SMTP id x24mr1892450pjn.113.1582588854288; Mon, 24 Feb 2020 16:00:54 -0800 (PST) Received: from apsdesk.mtv.corp.google.com ([2620:15c:202:1:e09a:8d06:a338:aafb]) by smtp.gmail.com with ESMTPSA id c188sm14477657pfb.151.2020.02.24.16.00.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Feb 2020 16:00:53 -0800 (PST) From: Abhishek Pandit-Subedi To: marcel@holtmann.org, luiz.dentz@gmail.com, alainm@chromium.org Cc: linux-bluetooth@vger.kernel.org, chromeos-bluetooth-upstreaming@chromium.org, Abhishek Pandit-Subedi , "David S. Miller" , Johan Hedberg , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Jakub Kicinski Subject: [RFC PATCH v3 5/5] Bluetooth: Pause discovery and advertising during suspend Date: Mon, 24 Feb 2020 16:00:36 -0800 Message-Id: <20200224160019.RFC.v3.5.Iccdad520469ca3524a7e5966c5f88e5bca756e13@changeid> X-Mailer: git-send-email 2.25.0.265.gbab2e86ba0-goog In-Reply-To: <20200225000036.156250-1-abhishekpandit@chromium.org> References: <20200225000036.156250-1-abhishekpandit@chromium.org> MIME-Version: 1.0 Sender: linux-bluetooth-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org To prevent spurious wake ups, we disable any discovery or advertising when we enter suspend and restore it when we exit suspend. While paused, we disable any management requests to modify discovery or advertising. Signed-off-by: Abhishek Pandit-Subedi --- Changes in v3: None Changes in v2: * Refactored pause discovery + advertising into its own patch include/net/bluetooth/hci_core.h | 11 ++++++++ net/bluetooth/hci_request.c | 43 ++++++++++++++++++++++++++++++++ net/bluetooth/mgmt.c | 41 ++++++++++++++++++++++++++++++ 3 files changed, 95 insertions(+) diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h index 2723a608183e..41ea2d8c73d4 100644 --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -91,6 +91,12 @@ struct discovery_state { #define SUSPEND_NOTIFIER_TIMEOUT msecs_to_jiffies(2000) /* 2 seconds */ enum suspend_tasks { + SUSPEND_PAUSE_DISCOVERY, + SUSPEND_UNPAUSE_DISCOVERY, + + SUSPEND_PAUSE_ADVERTISING, + SUSPEND_UNPAUSE_ADVERTISING, + SUSPEND_SCAN_DISABLE, SUSPEND_SCAN_ENABLE, SUSPEND_DISCONNECTING, @@ -407,6 +413,11 @@ struct hci_dev { struct discovery_state discovery; + int discovery_old_state; + bool discovery_paused; + int advertising_old_state; + bool advertising_paused; + struct notifier_block suspend_notifier; struct work_struct suspend_prepare; enum suspended_state suspend_state_next; diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c index 88fd95d70f89..e25cfb6fd9aa 100644 --- a/net/bluetooth/hci_request.c +++ b/net/bluetooth/hci_request.c @@ -1036,6 +1036,28 @@ void hci_req_prepare_suspend(struct hci_dev *hdev, enum suspended_state next) /* Mark device as suspended */ hdev->suspended = true; + /* Pause discovery if not already stopped */ + old_state = hdev->discovery.state; + if (old_state != DISCOVERY_STOPPED) { + set_bit(SUSPEND_PAUSE_DISCOVERY, hdev->suspend_tasks); + hci_discovery_set_state(hdev, DISCOVERY_STOPPING); + queue_work(hdev->req_workqueue, &hdev->discov_update); + } + + hdev->discovery_paused = true; + hdev->discovery_old_state = old_state; + + /* Stop advertising */ + old_state = hci_dev_test_flag(hdev, HCI_ADVERTISING); + if (old_state) { + set_bit(SUSPEND_PAUSE_ADVERTISING, hdev->suspend_tasks); + cancel_delayed_work(&hdev->discov_off); + queue_delayed_work(hdev->req_workqueue, + &hdev->discov_off, 0); + } + + hdev->advertising_paused = true; + hdev->advertising_old_state = old_state; /* Disable page scan */ page_scan = SCAN_DISABLED; hci_req_add(&req, HCI_OP_WRITE_SCAN_ENABLE, 1, &page_scan); @@ -1081,6 +1103,27 @@ void hci_req_prepare_suspend(struct hci_dev *hdev, enum suspended_state next) hci_req_clear_event_filter(&req); /* Reset passive/background scanning to normal */ hci_req_config_le_suspend_scan(&req); + + /* Unpause advertising */ + hdev->advertising_paused = false; + if (hdev->advertising_old_state) { + set_bit(SUSPEND_UNPAUSE_ADVERTISING, + hdev->suspend_tasks); + hci_dev_set_flag(hdev, HCI_ADVERTISING); + queue_work(hdev->req_workqueue, + &hdev->discoverable_update); + hdev->advertising_old_state = 0; + } + + /* Unpause discovery */ + hdev->discovery_paused = false; + if (hdev->discovery_old_state != DISCOVERY_STOPPED && + hdev->discovery_old_state != DISCOVERY_STOPPING) { + set_bit(SUSPEND_UNPAUSE_DISCOVERY, hdev->suspend_tasks); + hci_discovery_set_state(hdev, DISCOVERY_STARTING); + queue_work(hdev->req_workqueue, &hdev->discov_update); + } + hci_req_run(&req, suspend_req_complete); } diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c index 9a873097000b..b41c2e3cf3bb 100644 --- a/net/bluetooth/mgmt.c +++ b/net/bluetooth/mgmt.c @@ -1383,6 +1383,12 @@ static int set_discoverable(struct sock *sk, struct hci_dev *hdev, void *data, goto failed; } + if (hdev->advertising_paused) { + err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_DISCOVERABLE, + MGMT_STATUS_BUSY); + goto failed; + } + if (!hdev_is_powered(hdev)) { bool changed = false; @@ -3866,6 +3872,13 @@ void mgmt_start_discovery_complete(struct hci_dev *hdev, u8 status) } hci_dev_unlock(hdev); + + /* Handle suspend notifier */ + if (test_and_clear_bit(SUSPEND_UNPAUSE_DISCOVERY, + hdev->suspend_tasks)) { + BT_DBG("Unpaused discovery"); + wake_up(&hdev->suspend_wait_q); + } } static bool discovery_type_is_valid(struct hci_dev *hdev, uint8_t type, @@ -3927,6 +3940,13 @@ static int start_discovery_internal(struct sock *sk, struct hci_dev *hdev, goto failed; } + /* Can't start discovery when it is paused */ + if (hdev->discovery_paused) { + err = mgmt_cmd_complete(sk, hdev->id, op, MGMT_STATUS_BUSY, + &cp->type, sizeof(cp->type)); + goto failed; + } + /* Clear the discovery filter first to free any previously * allocated memory for the UUID list. */ @@ -4094,6 +4114,12 @@ void mgmt_stop_discovery_complete(struct hci_dev *hdev, u8 status) } hci_dev_unlock(hdev); + + /* Handle suspend notifier */ + if (test_and_clear_bit(SUSPEND_PAUSE_DISCOVERY, hdev->suspend_tasks)) { + BT_DBG("Paused discovery"); + wake_up(&hdev->suspend_wait_q); + } } static int stop_discovery(struct sock *sk, struct hci_dev *hdev, void *data, @@ -4325,6 +4351,17 @@ static void set_advertising_complete(struct hci_dev *hdev, u8 status, if (match.sk) sock_put(match.sk); + /* Handle suspend notifier */ + if (test_and_clear_bit(SUSPEND_PAUSE_ADVERTISING, + hdev->suspend_tasks)) { + BT_DBG("Paused advertising"); + wake_up(&hdev->suspend_wait_q); + } else if (test_and_clear_bit(SUSPEND_UNPAUSE_ADVERTISING, + hdev->suspend_tasks)) { + BT_DBG("Unpaused advertising"); + wake_up(&hdev->suspend_wait_q); + } + /* If "Set Advertising" was just disabled and instance advertising was * set up earlier, then re-enable multi-instance advertising. */ @@ -4376,6 +4413,10 @@ static int set_advertising(struct sock *sk, struct hci_dev *hdev, void *data, return mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_ADVERTISING, MGMT_STATUS_INVALID_PARAMS); + if (hdev->advertising_paused) + return mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_ADVERTISING, + MGMT_STATUS_BUSY); + hci_dev_lock(hdev); val = !!cp->val;