From patchwork Mon Oct 25 13:24:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: P Praneesh X-Patchwork-Id: 12581869 X-Patchwork-Delegate: kvalo@adurom.com 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 EE099C4332F for ; Mon, 25 Oct 2021 13:25:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D3E6560724 for ; Mon, 25 Oct 2021 13:25:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232674AbhJYN1Y (ORCPT ); Mon, 25 Oct 2021 09:27:24 -0400 Received: from alexa-out.qualcomm.com ([129.46.98.28]:25654 "EHLO alexa-out.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232539AbhJYN1V (ORCPT ); Mon, 25 Oct 2021 09:27:21 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1635168299; x=1666704299; h=from:to:cc:subject:date:message-id:mime-version; bh=fXJuwM6QfGlCo/Fbit7MSCqDMyOusa8Ik2tTKL4Hq1c=; b=Gfdj+HtuQP/B5CCFblZGpy66FBq+83kc3ovtiMwwzVYDQVhIQHB/aFh2 L/TjKeeNysuOXSOSYmZBjUOttVJBeG2vU2Uc9XJN1QXyxv9JqHDxIOU9I to6fSDjLyVR/GRwQKiccfQbiztxGOBg7lnPb+2DZi8L5dKVlW8Vd2cfmm E=; Received: from ironmsg-lv-alpha.qualcomm.com ([10.47.202.13]) by alexa-out.qualcomm.com with ESMTP; 25 Oct 2021 06:24:59 -0700 X-QCInternal: smtphost Received: from nalasex01a.na.qualcomm.com ([10.47.209.196]) by ironmsg-lv-alpha.qualcomm.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Oct 2021 06:24:58 -0700 Received: from ppranees-linux.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.922.7; Mon, 25 Oct 2021 06:24:56 -0700 From: P Praneesh To: CC: , P Praneesh , Lavanya Suresh Subject: [PATCH v2] ath11k: Increment pending_mgmt_tx count before tx send invoke Date: Mon, 25 Oct 2021 18:54:42 +0530 Message-ID: <1635168282-8845-1-git-send-email-quic_ppranees@quicinc.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01a.na.qualcomm.com (10.47.209.196) Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org There is a race condition whereby the tx completion handler can be invoked before the 'num_pending_mgmt_tx" count is incremented. If that occurs, we could get warning trace indicating that 'num_pending_mgmt_tx' is 0 (because it was not yet incremented). Ideally, this trace should be seen only if mgmt tx has not happened but tx completion is received, and it is not expected in this race condition. Tested-on: QCN9074 hw1.0 PCI WLAN.HK.2.4.0.1-01386-QCAHKSWPL_SILICONZ-1 Co-developed-by: Lavanya Suresh Signed-off-by: Lavanya Suresh Signed-off-by: P Praneesh --- v2: - corrected signed off detail. --- drivers/net/wireless/ath/ath11k/mac.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c index 1cc5560..56f3208 100644 --- a/drivers/net/wireless/ath/ath11k/mac.c +++ b/drivers/net/wireless/ath/ath11k/mac.c @@ -5048,13 +5048,15 @@ static void ath11k_mgmt_over_wmi_tx_work(struct work_struct *work) arvif = ath11k_vif_to_arvif(skb_cb->vif); if (ar->allocated_vdev_map & (1LL << arvif->vdev_id) && arvif->is_started) { + atomic_inc(&ar->num_pending_mgmt_tx); ret = ath11k_mac_mgmt_tx_wmi(ar, arvif, skb); if (ret) { + if (atomic_dec_if_positive(&ar->num_pending_mgmt_tx) < 0) + WARN_ON_ONCE(1); + ath11k_warn(ar->ab, "failed to tx mgmt frame, vdev_id %d :%d\n", arvif->vdev_id, ret); ieee80211_free_txskb(ar->hw, skb); - } else { - atomic_inc(&ar->num_pending_mgmt_tx); } } else { ath11k_warn(ar->ab,