From patchwork Thu Dec 10 00:35:43 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Chan X-Patchwork-Id: 554953 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 6A51F140F93 for ; Thu, 10 Dec 2015 11:36:20 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753829AbbLJAgJ (ORCPT ); Wed, 9 Dec 2015 19:36:09 -0500 Received: from mail-gw3-out.broadcom.com ([216.31.210.64]:32297 "EHLO mail-gw3-out.broadcom.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752815AbbLJAfz (ORCPT ); Wed, 9 Dec 2015 19:35:55 -0500 X-IronPort-AV: E=Sophos;i="5.20,405,1444719600"; d="scan'208";a="82756080" Received: from irvexchcas07.broadcom.com (HELO IRVEXCHCAS07.corp.ad.broadcom.com) ([10.9.208.55]) by mail-gw3-out.broadcom.com with ESMTP; 09 Dec 2015 17:10:22 -0800 Received: from IRVEXCHSMTP1.corp.ad.broadcom.com (10.9.207.51) by IRVEXCHCAS07.corp.ad.broadcom.com (10.9.208.55) with Microsoft SMTP Server (TLS) id 14.3.235.1; Wed, 9 Dec 2015 16:35:54 -0800 Received: from mail-irva-13.broadcom.com (10.10.10.20) by IRVEXCHSMTP1.corp.ad.broadcom.com (10.9.207.51) with Microsoft SMTP Server id 14.3.235.1; Wed, 9 Dec 2015 16:35:54 -0800 Received: from localhost.broadcom.com (unknown [10.12.136.177]) by mail-irva-13.broadcom.com (Postfix) with ESMTP id 5C82341062; Wed, 9 Dec 2015 16:32:19 -0800 (PST) From: Michael Chan To: CC: Subject: [PATCH net v2 3/4] bnxt_en: Don't cancel sp_task from bnxt_close_nic(). Date: Wed, 9 Dec 2015 19:35:43 -0500 Message-ID: <1449707744-7844-4-git-send-email-mchan@broadcom.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1449707744-7844-1-git-send-email-mchan@broadcom.com> References: <1449707744-7844-1-git-send-email-mchan@broadcom.com> MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org When implementing driver reset from tx_timeout in the next patch, bnxt_close_nic() will be called from the sp_task workqueue. Calling cancel_work() on sp_task will hang the workqueue. Instead, set a new bit BNXT_STATE_IN_SP_TASK when bnxt_sp_task() is running. bnxt_close_nic() will wait for BNXT_STATE_IN_SP_TASK to clear before proceeding. Signed-off-by: Michael Chan --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 13 +++++++++++-- drivers/net/ethernet/broadcom/bnxt/bnxt.h | 1 + 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index fd89e9d..f5f4489 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -4679,7 +4679,9 @@ int bnxt_close_nic(struct bnxt *bp, bool irq_re_init, bool link_re_init) bnxt_tx_disable(bp); clear_bit(BNXT_STATE_OPEN, &bp->state); - cancel_work_sync(&bp->sp_task); + smp_mb__after_atomic(); + while (test_bit(BNXT_STATE_IN_SP_TASK, &bp->state)) + msleep(20); /* Flush rings before disabling interrupts */ bnxt_shutdown_nic(bp, irq_re_init); @@ -5080,8 +5082,12 @@ static void bnxt_sp_task(struct work_struct *work) struct bnxt *bp = container_of(work, struct bnxt, sp_task); int rc; - if (!test_bit(BNXT_STATE_OPEN, &bp->state)) + set_bit(BNXT_STATE_IN_SP_TASK, &bp->state); + smp_mb__after_atomic(); + if (!test_bit(BNXT_STATE_OPEN, &bp->state)) { + clear_bit(BNXT_STATE_IN_SP_TASK, &bp->state); return; + } if (test_and_clear_bit(BNXT_RX_MASK_SP_EVENT, &bp->sp_event)) bnxt_cfg_rx_mode(bp); @@ -5107,6 +5113,9 @@ static void bnxt_sp_task(struct work_struct *work) } if (test_and_clear_bit(BNXT_RESET_TASK_SP_EVENT, &bp->sp_event)) bnxt_reset_task(bp); + + smp_mb__before_atomic(); + clear_bit(BNXT_STATE_IN_SP_TASK, &bp->state); } static int bnxt_init_board(struct pci_dev *pdev, struct net_device *dev) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h index a8b6881..f199f4c 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h @@ -927,6 +927,7 @@ struct bnxt { unsigned long state; #define BNXT_STATE_OPEN 0 +#define BNXT_STATE_IN_SP_TASK 1 struct bnxt_irq *irq_tbl; u8 mac_addr[ETH_ALEN];