From mboxrd@z Thu Jan 1 00:00:00 1970 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=-6.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 9E673C43381 for ; Thu, 21 Feb 2019 14:39:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6CF032080D for ; Thu, 21 Feb 2019 14:39:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550759980; bh=VUich4jzqii1URLjDBRR43geCX8ciEhhc/CTjZvUqig=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Jw/IOKs4q3CiEHdQADgyU3IpVfBcEFlhQyQpKdwfkx/AABlA79r3vnnWAfGssBu7Z TOztLkos6g+tzRwemOWlLG3LMMHBbm45c836axUSzx4vRIi8ICD95X8AWk8rfNSRvz QXpiuPsA8BHpT4YySh7e8Wsfk5qf4Yuw1WccWdZY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728967AbfBUOjj (ORCPT ); Thu, 21 Feb 2019 09:39:39 -0500 Received: from mail.kernel.org ([198.145.29.99]:33614 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728451AbfBUOjh (ORCPT ); Thu, 21 Feb 2019 09:39:37 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0E5212080D; Thu, 21 Feb 2019 14:39:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550759976; bh=VUich4jzqii1URLjDBRR43geCX8ciEhhc/CTjZvUqig=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MpxxTe6VQgBMz4Q/6damMtafElkXalTcO5P6axQ/CgRVA1N7G8IBILfJLkvN/1CX5 XfhqL8NWi7Cxsj2uRVMRsazSBed3yGNEZUPefG9I50XJjtSNf0aitOiMl8w/CCEtvn nbRp7GFy9X1V3/TN+r4k6m1+cr4jM3/7IcGtuySs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jose Abreu , Joao Pinto , "David S. Miller" , Giuseppe Cavallaro , Alexandre Torgue Subject: [PATCH 4.14 11/23] net: stmmac: Fix a race in EEE enable callback Date: Thu, 21 Feb 2019 15:35:53 +0100 Message-Id: <20190221125247.156333658@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190221125246.162644302@linuxfoundation.org> References: <20190221125246.162644302@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jose Abreu [ Upstream commit 8a7493e58ad688eb23b81e45461c5d314f4402f1 ] We are saving the status of EEE even before we try to enable it. This leads to a race with XMIT function that tries to arm EEE timer before we set it up. Fix this by only saving the EEE parameters after all operations are performed with success. Signed-off-by: Jose Abreu Fixes: d765955d2ae0 ("stmmac: add the Energy Efficient Ethernet support") Cc: Joao Pinto Cc: David S. Miller Cc: Giuseppe Cavallaro Cc: Alexandre Torgue Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c | 22 ++++++++++--------- 1 file changed, 12 insertions(+), 10 deletions(-) --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c @@ -675,25 +675,27 @@ static int stmmac_ethtool_op_set_eee(str struct ethtool_eee *edata) { struct stmmac_priv *priv = netdev_priv(dev); + int ret; - priv->eee_enabled = edata->eee_enabled; - - if (!priv->eee_enabled) + if (!edata->eee_enabled) { stmmac_disable_eee_mode(priv); - else { + } else { /* We are asking for enabling the EEE but it is safe * to verify all by invoking the eee_init function. * In case of failure it will return an error. */ - priv->eee_enabled = stmmac_eee_init(priv); - if (!priv->eee_enabled) + edata->eee_enabled = stmmac_eee_init(priv); + if (!edata->eee_enabled) return -EOPNOTSUPP; - - /* Do not change tx_lpi_timer in case of failure */ - priv->tx_lpi_timer = edata->tx_lpi_timer; } - return phy_ethtool_set_eee(dev->phydev, edata); + ret = phy_ethtool_set_eee(dev->phydev, edata); + if (ret) + return ret; + + priv->eee_enabled = edata->eee_enabled; + priv->tx_lpi_timer = edata->tx_lpi_timer; + return 0; } static u32 stmmac_usec2riwt(u32 usec, struct stmmac_priv *priv)