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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 76A99C00140 for ; Thu, 18 Aug 2022 03:55:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239620AbiHRDzy (ORCPT ); Wed, 17 Aug 2022 23:55:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48946 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243108AbiHRDzW (ORCPT ); Wed, 17 Aug 2022 23:55:22 -0400 Received: from smtp-fw-6002.amazon.com (smtp-fw-6002.amazon.com [52.95.49.90]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EFEC6A8CF2 for ; Wed, 17 Aug 2022 20:55:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1660794922; x=1692330922; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=HIa4AiWfwDtXrTlt3aMx/E4W69Ac0lB5I+w+tMoznn0=; b=upHYNkiFFO4KC+j9wqrYt8Cv2NK/XjS9ENrb0+FChYtVeWJ+tweO+gWu QKe5MI/I6lelBHJJ3anbHucfSPL3DLKMXSlE9w5HeKvykL9veEd0XmbDw Czl2fEogbMKUPrYcGG2d+CQvRFC/p1EaGBvXDaJHEGGYy2jtdeeen1r44 U=; X-IronPort-AV: E=Sophos;i="5.93,245,1654560000"; d="scan'208";a="234359225" Received: from iad12-co-svc-p1-lb1-vlan3.amazon.com (HELO email-inbound-relay-iad-1a-2d7489a4.us-east-1.amazon.com) ([10.43.8.6]) by smtp-border-fw-6002.iad6.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Aug 2022 03:55:21 +0000 Received: from EX13MTAUWB001.ant.amazon.com (iad12-ws-svc-p26-lb9-vlan2.iad.amazon.com [10.40.163.34]) by email-inbound-relay-iad-1a-2d7489a4.us-east-1.amazon.com (Postfix) with ESMTPS id BF5298C0A6E; Thu, 18 Aug 2022 03:55:19 +0000 (UTC) Received: from EX19D004ANA001.ant.amazon.com (10.37.240.138) by EX13MTAUWB001.ant.amazon.com (10.43.161.207) with Microsoft SMTP Server (TLS) id 15.0.1497.38; Thu, 18 Aug 2022 03:55:18 +0000 Received: from 88665a182662.ant.amazon.com.com (10.43.160.55) by EX19D004ANA001.ant.amazon.com (10.37.240.138) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1118.12; Thu, 18 Aug 2022 03:55:16 +0000 From: Kuniyuki Iwashima To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni CC: Kuniyuki Iwashima , Kuniyuki Iwashima , , Stephen Hemminger Subject: [PATCH v2 net 10/17] net: Fix a data-race around netdev_budget. Date: Wed, 17 Aug 2022 20:52:20 -0700 Message-ID: <20220818035227.81567-11-kuniyu@amazon.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220818035227.81567-1-kuniyu@amazon.com> References: <20220818035227.81567-1-kuniyu@amazon.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.43.160.55] X-ClientProxiedBy: EX13D29UWA002.ant.amazon.com (10.43.160.63) To EX19D004ANA001.ant.amazon.com (10.37.240.138) Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org While reading netdev_budget, it can be changed concurrently. Thus, we need to add READ_ONCE() to its reader. Fixes: 51b0bdedb8e7 ("[NET]: Separate two usages of netdev_max_backlog.") Signed-off-by: Kuniyuki Iwashima --- CC: Stephen Hemminger --- net/core/dev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/core/dev.c b/net/core/dev.c index 4705e6630efa..c83e23cfc57d 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -6666,7 +6666,7 @@ static __latent_entropy void net_rx_action(struct softirq_action *h) struct softnet_data *sd = this_cpu_ptr(&softnet_data); unsigned long time_limit = jiffies + usecs_to_jiffies(netdev_budget_usecs); - int budget = netdev_budget; + int budget = READ_ONCE(netdev_budget); LIST_HEAD(list); LIST_HEAD(repoll); -- 2.30.2