From patchwork Mon Feb 22 12:36:30 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 386126 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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, 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 1313DC4332B for ; Mon, 22 Feb 2021 12:50:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BBF2D64E84 for ; Mon, 22 Feb 2021 12:49:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231613AbhBVMtn (ORCPT ); Mon, 22 Feb 2021 07:49:43 -0500 Received: from mail.kernel.org ([198.145.29.99]:57400 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231483AbhBVMqF (ORCPT ); Mon, 22 Feb 2021 07:46:05 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 6B3B464F57; Mon, 22 Feb 2021 12:41:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1613997701; bh=ssjLo+l+SykrjKG9DQqcEgT0SrriNCxaSatxwJQ8eYE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EW2zcT5GFnv4Am6CJA1Jya6AP7x9e+lzcKkc2pkqsMG1qS473rjQKqQpJNZUdRQD5 abXT0rRtohjPOITOY2Xj1rJFTj3HiMvOwwRamqZYa8tPPP2TrtyB5Qx2tTubD4cTGj Pa3SNY5ZA7botHORtn7wL8NrO3dSRM5uz8MG0wRw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Edwin Peer , Jakub Kicinski , "David S. Miller" Subject: [PATCH 4.9 32/49] net: watchdog: hold device global xmit lock during tx disable Date: Mon, 22 Feb 2021 13:36:30 +0100 Message-Id: <20210222121027.328676719@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210222121022.546148341@linuxfoundation.org> References: <20210222121022.546148341@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Edwin Peer commit 3aa6bce9af0e25b735c9c1263739a5639a336ae8 upstream. Prevent netif_tx_disable() running concurrently with dev_watchdog() by taking the device global xmit lock. Otherwise, the recommended: netif_carrier_off(dev); netif_tx_disable(dev); driver shutdown sequence can happen after the watchdog has already checked carrier, resulting in possible false alarms. This is because netif_tx_lock() only sets the frozen bit without maintaining the locks on the individual queues. Fixes: c3f26a269c24 ("netdev: Fix lockdep warnings in multiqueue configurations.") Signed-off-by: Edwin Peer Reviewed-by: Jakub Kicinski Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- include/linux/netdevice.h | 2 ++ 1 file changed, 2 insertions(+) --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -3701,6 +3701,7 @@ static inline void netif_tx_disable(stru local_bh_disable(); cpu = smp_processor_id(); + spin_lock(&dev->tx_global_lock); for (i = 0; i < dev->num_tx_queues; i++) { struct netdev_queue *txq = netdev_get_tx_queue(dev, i); @@ -3708,6 +3709,7 @@ static inline void netif_tx_disable(stru netif_tx_stop_queue(txq); __netif_tx_unlock(txq); } + spin_unlock(&dev->tx_global_lock); local_bh_enable(); }