From patchwork Mon Sep 28 17:58:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Nguyen X-Patchwork-Id: 260013 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 33BECC2D0A8 for ; Mon, 28 Sep 2020 17:59:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D9130208D5 for ; Mon, 28 Sep 2020 17:59:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726668AbgI1R73 (ORCPT ); Mon, 28 Sep 2020 13:59:29 -0400 Received: from mga18.intel.com ([134.134.136.126]:32955 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726596AbgI1R7Y (ORCPT ); Mon, 28 Sep 2020 13:59:24 -0400 IronPort-SDR: RxB/eDsU8gAQ3jzXqXgyH9rP3F/Tg9QQdzH1Tl4HZ1BSOqcKd1uhNbCu4wPkuyZn+SHsslRIYs sGTKbWoeX4XA== X-IronPort-AV: E=McAfee;i="6000,8403,9758"; a="149810266" X-IronPort-AV: E=Sophos;i="5.77,313,1596524400"; d="scan'208";a="149810266" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Sep 2020 10:59:22 -0700 IronPort-SDR: PA1m4w2pjysjpH1PcZWmORAP90KvbafEjiFJ9X50WUu7GRb/KD86nCKWioLZH/D9KhupYEaaek qtOGCG2VZg2A== X-IronPort-AV: E=Sophos;i="5.77,313,1596524400"; d="scan'208";a="340505382" Received: from jtkirshe-desk1.jf.intel.com ([134.134.177.86]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Sep 2020 10:59:21 -0700 From: Tony Nguyen To: davem@davemloft.net Cc: Andre Guedes , netdev@vger.kernel.org, nhorman@redhat.com, sassmann@redhat.com, anthony.l.nguyen@intel.com, Aaron Brown Subject: [net-next 05/15] igc: Don't reschedule ptp_tx work Date: Mon, 28 Sep 2020 10:58:58 -0700 Message-Id: <20200928175908.318502-6-anthony.l.nguyen@intel.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200928175908.318502-1-anthony.l.nguyen@intel.com> References: <20200928175908.318502-1-anthony.l.nguyen@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Andre Guedes The ptp_tx work is scheduled only if TSICR.TXTS bit is set, therefore TSYNCTXCTL.TXTT_0 bit is expected to be set when we check it igc_ptp_tx_ work(). If it isn't, something is really off and rescheduling the ptp_tx work to check it later doesn't help much. This patch changes the code to WARN_ON_ONCE() if this situation ever happens. Signed-off-by: Andre Guedes Tested-by: Aaron Brown Signed-off-by: Tony Nguyen --- drivers/net/ethernet/intel/igc/igc_ptp.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c b/drivers/net/ethernet/intel/igc/igc_ptp.c index dbe0776a7f2f..791f406f1314 100644 --- a/drivers/net/ethernet/intel/igc/igc_ptp.c +++ b/drivers/net/ethernet/intel/igc/igc_ptp.c @@ -429,11 +429,10 @@ static void igc_ptp_tx_work(struct work_struct *work) } tsynctxctl = rd32(IGC_TSYNCTXCTL); - if (tsynctxctl & IGC_TSYNCTXCTL_TXTT_0) - igc_ptp_tx_hwtstamp(adapter); - else - /* reschedule to check later */ - schedule_work(&adapter->ptp_tx_work); + if (WARN_ON_ONCE(!(tsynctxctl & IGC_TSYNCTXCTL_TXTT_0))) + return; + + igc_ptp_tx_hwtstamp(adapter); } /**