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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 51465C43603 for ; Wed, 4 Dec 2019 18:00:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 24EC32084B for ; Wed, 4 Dec 2019 18:00:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1575482437; bh=AdY9CoZS6VbSim8ej2vJKKJ5+4ut52l1UdMkaC/yLbQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=MLb6q1mofjV+sWquTJRfcc+wVXEZgefFMas+4C8oFKGt6ap9rP5rC4em4oblJyBWy Q0O/VCMAXUnuKTJJcj84TOFVWOt3yrbMw7ri584v47czjh8Y+muRdotxxrkj+IUgA9 A/tHFyZ9N7p3ZJYdn2fbJJOlNMumkL5KA1BexdOQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729389AbfLDSAf (ORCPT ); Wed, 4 Dec 2019 13:00:35 -0500 Received: from mail.kernel.org ([198.145.29.99]:39222 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729348AbfLDSAb (ORCPT ); Wed, 4 Dec 2019 13:00:31 -0500 Received: from localhost (unknown [217.68.49.72]) (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 6520D2084B; Wed, 4 Dec 2019 18:00:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1575482430; bh=AdY9CoZS6VbSim8ej2vJKKJ5+4ut52l1UdMkaC/yLbQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cIfi40BCo1ZQWpx3EYM7sG6LvQu2ry0Fq/9aZz+qygsTjxsJzuoUs0nZzh3ttEgLL mQVADSMEzL4OAQkulp1rd9k+lVo/l/7t4CrUWEQ26O4Hu+RUeZPR+yLU/2Ktp5Oik/ mnUyyUQJqZVDvgM2YRJtCYhpTotL4fSNItzAdusY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Menglong Dong , "David S. Miller" Subject: [PATCH 4.4 83/92] macvlan: schedule bc_work even if error Date: Wed, 4 Dec 2019 18:50:23 +0100 Message-Id: <20191204174335.185471437@linuxfoundation.org> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191204174327.215426506@linuxfoundation.org> References: <20191204174327.215426506@linuxfoundation.org> User-Agent: quilt/0.66 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 From: Menglong Dong [ Upstream commit 1d7ea55668878bb350979c377fc72509dd6f5b21 ] While enqueueing a broadcast skb to port->bc_queue, schedule_work() is called to add port->bc_work, which processes the skbs in bc_queue, to "events" work queue. If port->bc_queue is full, the skb will be discarded and schedule_work(&port->bc_work) won't be called. However, if port->bc_queue is full and port->bc_work is not running or pending, port->bc_queue will keep full and schedule_work() won't be called any more, and all broadcast skbs to macvlan will be discarded. This case can happen: macvlan_process_broadcast() is the pending function of port->bc_work, it moves all the skbs in port->bc_queue to the queue "list", and processes the skbs in "list". During this, new skbs will keep being added to port->bc_queue in macvlan_broadcast_enqueue(), and port->bc_queue may already full when macvlan_process_broadcast() return. This may happen, especially when there are a lot of real-time threads and the process is preempted. Fix this by calling schedule_work(&port->bc_work) even if port->bc_work is full in macvlan_broadcast_enqueue(). Fixes: 412ca1550cbe ("macvlan: Move broadcasts into a work queue") Signed-off-by: Menglong Dong Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/macvlan.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/net/macvlan.c +++ b/drivers/net/macvlan.c @@ -326,10 +326,11 @@ static void macvlan_broadcast_enqueue(st } spin_unlock(&port->bc_queue.lock); + schedule_work(&port->bc_work); + if (err) goto free_nskb; - schedule_work(&port->bc_work); return; free_nskb: