From patchwork Fri Jul 22 00:26:00 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: 592889 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 A51B4C43334 for ; Fri, 22 Jul 2022 00:26:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233176AbiGVA0F (ORCPT ); Thu, 21 Jul 2022 20:26:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52450 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233481AbiGVA0E (ORCPT ); Thu, 21 Jul 2022 20:26:04 -0400 Received: from mail-pj1-x1035.google.com (mail-pj1-x1035.google.com [IPv6:2607:f8b0:4864:20::1035]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5CAA687232 for ; Thu, 21 Jul 2022 17:26:03 -0700 (PDT) Received: by mail-pj1-x1035.google.com with SMTP id s18-20020a17090aa11200b001f1e9e2438cso6802562pjp.2 for ; Thu, 21 Jul 2022 17:26:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:subject:date:message-id:mime-version :content-transfer-encoding; bh=TJNc1ptOUQntvWRKuqSnCEsdNI0TJwvIdxhe6AwEyRw=; b=SbuVJqL+h129ATCC5aXvrulTmuYmL6aYbc1RGf4cWGOzyuxAEBcre7gYKh8pvV+GIH Qtj6lIJN9G6I19A8zNR9SOeCc+RG7ryKCziQVBKqQbew4H8EoEhuLxGwmv47+sPbCab/ zc2t3fFByJa2NXaxcFiv/1/u/mIQmeMEZnpEG5JHC41bvSVIvIsGhFz5wREvlrBkcgzd QT9Md/RWkm5KJ/nYQMkYEHuLaAvVypSMlji1oyA6FR9BGVlHRAyToRvEnWHWvlJL9rLw 9IuOqCCPyun7Qg1T147sR0/C9uCc+O1U3W0wwBMNYzYBCJd+7Rwz913Qtyo+ZtKZnab5 OCtw== 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:mime-version :content-transfer-encoding; bh=TJNc1ptOUQntvWRKuqSnCEsdNI0TJwvIdxhe6AwEyRw=; b=Or8hGg5sBU6u8u4Srpj7DMLDGxvhTmoLas53P0q3HLhophmJN2xbPrm0dhwlQ1qHq6 3Opy/ECopHuMWR/qjvunLlll3sd6pPxKCZFaBo3h2NT+XcjxRcS7TLV9P5epQ/yQFCcK hEGI+SvdOUuQ/hV2UXf49o32s3gxUOoYgepi1K8hXngmCBt6oxi/1TQdgHjFWIePAYO+ Km03YP9bWl8dQaSA2icfJp9adw9rzj9LUbj4ue6UDczumJYbyMHKRnz/6cPMOXF3QxB/ +fHUrSU4e4EhF11PaRK3UqJlWdhrNW4J+wTht965tK7lixiUjzFItJmPJpBjbeOGigU2 zkHw== X-Gm-Message-State: AJIora8JT+Hvt7aUglBV3jx3dnZImg6wT8BgEFKGOGq2ekG/Gc/9PdVR c7PG/QqN2ee65mUEXD7bPuaeFAm0kSPMSg== X-Google-Smtp-Source: AGRyM1uADGTQmG6Q61SlEjy/UAo/I81Zn31+FJSWxvG8+Itwx/UkOvZvWeNVywuQwwEwFX8hx/Xrcw== X-Received: by 2002:a17:90b:3b4d:b0:1f0:4547:8a31 with SMTP id ot13-20020a17090b3b4d00b001f045478a31mr1075614pjb.129.1658449562232; Thu, 21 Jul 2022 17:26:02 -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 i128-20020a636d86000000b0041a4df3d3e2sm2070676pgc.68.2022.07.21.17.26.00 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Jul 2022 17:26:01 -0700 (PDT) From: Luiz Augusto von Dentz To: linux-bluetooth@vger.kernel.org Subject: [PATCH v2] Bluetooth: MGMT: Fix helding hci_conn reference while command is queued Date: Thu, 21 Jul 2022 17:26:00 -0700 Message-Id: <20220722002600.632792-1-luiz.dentz@gmail.com> X-Mailer: git-send-email 2.36.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org From: Luiz Augusto von Dentz This removes the use of hci_conn_hold from Get Conn Info and Get Clock Info since the callback can just do a lookup by address using the cmd data and only then set cmd->user_data to pass to the complete callback. Signed-off-by: Luiz Augusto von Dentz --- v2: Fix CI findings net/bluetooth/mgmt.c | 51 +++++++++++--------------------------------- 1 file changed, 12 insertions(+), 39 deletions(-) diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c index 0c6878095709..aa651129b714 100644 --- a/net/bluetooth/mgmt.c +++ b/net/bluetooth/mgmt.c @@ -6711,11 +6711,6 @@ static void get_conn_info_complete(struct hci_dev *hdev, void *data, int err) mgmt_cmd_complete(cmd->sk, cmd->index, MGMT_OP_GET_CONN_INFO, status, &rp, sizeof(rp)); - if (conn) { - hci_conn_drop(conn); - hci_conn_put(conn); - } - mgmt_pending_free(cmd); } @@ -6734,15 +6729,10 @@ static int get_conn_info_sync(struct hci_dev *hdev, void *data) else conn = hci_conn_hash_lookup_ba(hdev, LE_LINK, &cp->addr.bdaddr); - if (!conn || conn != cmd->user_data || conn->state != BT_CONNECTED) { - if (cmd->user_data) { - hci_conn_drop(cmd->user_data); - hci_conn_put(cmd->user_data); - cmd->user_data = NULL; - } + if (!conn || conn->state != BT_CONNECTED) return MGMT_STATUS_NOT_CONNECTED; - } + cmd->user_data = conn; handle = cpu_to_le16(conn->handle); /* Refresh RSSI each time */ @@ -6824,8 +6814,6 @@ static int get_conn_info(struct sock *sk, struct hci_dev *hdev, void *data, if (!cmd) { err = -ENOMEM; } else { - hci_conn_hold(conn); - cmd->user_data = hci_conn_get(conn); err = hci_cmd_sync_queue(hdev, get_conn_info_sync, cmd, get_conn_info_complete); } @@ -6878,8 +6866,6 @@ static void get_clock_info_complete(struct hci_dev *hdev, void *data, int err) if (conn) { rp.piconet_clock = cpu_to_le32(conn->clock); rp.accuracy = cpu_to_le16(conn->clock_accuracy); - hci_conn_drop(conn); - hci_conn_put(conn); } complete: @@ -6894,30 +6880,21 @@ static int get_clock_info_sync(struct hci_dev *hdev, void *data) struct mgmt_pending_cmd *cmd = data; struct mgmt_cp_get_clock_info *cp = cmd->param; struct hci_cp_read_clock hci_cp; - struct hci_conn *conn = cmd->user_data; - int err; + struct hci_conn *conn; memset(&hci_cp, 0, sizeof(hci_cp)); - err = hci_read_clock_sync(hdev, &hci_cp); + hci_read_clock_sync(hdev, &hci_cp); - if (conn) { - /* Make sure connection still exists */ - conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, - &cp->addr.bdaddr); + /* Make sure connection still exists */ + conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &cp->addr.bdaddr); + if (!conn || conn->state != BT_CONNECTED) + return MGMT_STATUS_NOT_CONNECTED; - if (conn && conn == cmd->user_data && - conn->state == BT_CONNECTED) { - hci_cp.handle = cpu_to_le16(conn->handle); - hci_cp.which = 0x01; /* Piconet clock */ - err = hci_read_clock_sync(hdev, &hci_cp); - } else if (cmd->user_data) { - hci_conn_drop(cmd->user_data); - hci_conn_put(cmd->user_data); - cmd->user_data = NULL; - } - } + cmd->user_data = conn; + hci_cp.handle = cpu_to_le16(conn->handle); + hci_cp.which = 0x01; /* Piconet clock */ - return err; + return hci_read_clock_sync(hdev, &hci_cp); } static int get_clock_info(struct sock *sk, struct hci_dev *hdev, void *data, @@ -6976,10 +6953,6 @@ static int get_clock_info(struct sock *sk, struct hci_dev *hdev, void *data, if (cmd) mgmt_pending_free(cmd); - - } else if (conn) { - hci_conn_hold(conn); - cmd->user_data = hci_conn_get(conn); }