From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f42.google.com (mail-wm1-f42.google.com [209.85.128.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 702FA37C923 for ; Tue, 1 Sep 2026 12:07:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.42 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788264468; cv=none; b=VDwajZMntxHGh6HoauNFiwUO1QsdgC4AGH/qzO56oZTqNTZI3MkHmn/De217CG6UgnPELxvkbq5JsSR9G9Ze4zpDJzLVzm7bvuqsMZmcg/2AdXQ+glYO2kcHHKxBGUDM4GipDwneCd/QYL6YWCJ/BpCJkZJk5QifvtVoTzvNglI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788264468; c=relaxed/simple; bh=yJfkb3hM5Pba0nKvWUAIgOdfux2UtM7ON45POiZc+dE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=L0VsjUwlCv8Um0XTYpXrR9o+3qLLOuaS3vTpncELLjSwP9w8Oo0jZe731jAGlD/HW3XKJuBo2saJ2ecYV18pKBEztWEOlx2CaK4H+hhi+axo4KjhViSnsMKru2Gc2VGlqHJMembAjnJU5c0wTBZQmS0SQAmPNiLP8MRSknlRaSo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=blackwall.org; spf=none smtp.mailfrom=blackwall.org; dkim=pass (2048-bit key) header.d=blackwall.org header.i=@blackwall.org header.b=NaEyfW0b; arc=none smtp.client-ip=209.85.128.42 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=blackwall.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=blackwall.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=blackwall.org header.i=@blackwall.org header.b="NaEyfW0b" Received: by mail-wm1-f42.google.com with SMTP id 5b1f17b1804b1-49b0d78a801so37737945e9.2 for ; Tue, 01 Sep 2026 05:07:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=blackwall.org; s=google; t=1788264466; x=1788869266; darn=lists.linux.dev; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=2HFs9DuHBOZWo0pRLMgZ/aZaO5LCPX7IYZ0kiem5E6M=; b=NaEyfW0bn/WsN5F+/I/LMgQ8mxz9ewsrroHKjOUP6alHDXdeHMVfGTIel/26E0GZEo 2eVb3VUo/KtsmGbCCsQmsQfxxAZvKWyNI8Bvcvx8bCa1Euqbt7m0yURxydG8bYJmnya3 az1orB9Bn1KuXIDlEWz2DuNFGLhOCqr4bMj/VOSy3B86FPWzV5PQOdMID60Khwprsgyt vbu89h9L2h5IFoEiC+Q69wlOhRa7UeAWzCljkIExPVQW+H3Xd0D2Y/TPewy8rrGHYp3a Ib1EgryzLae4aD54nh/KWJYnyNQFWv8n+oDZLJPQnw1WOk93OWtNXu1Wr4NalISRZpkE /Kbw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1788264466; x=1788869266; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=2HFs9DuHBOZWo0pRLMgZ/aZaO5LCPX7IYZ0kiem5E6M=; b=WQ2+IANvnf4MJ6v8dI9hVB2pZG8x0Cg/+RqZBWmR1qK73xmQzQUj+j6YAiOBzYWBZ4 bu4d/n5hB/DFw81VVndQyt01F/3b3SaNp6pzRCZ26lodOLcEA5LNJ5TGnQl3JIo0QlaL 05fsMIm0wpY0GVkbLWvg/U8dCiLuusB/VSmx4/loSdijwzF1UhYXG5tmMfcHjJwYFw7A X7m42BeLkEJdihls5JfmLEwToa5ho2D5C4Zn9nz1Oq42iuk9Gr5heWEl7BeICdi2LVFk veOultYXdvotkV9f3iiN01Bm2x7jMBlbnNjAtVtf36mkv0V5rz1WNJtSllepWeDqYshu tw3w== X-Forwarded-Encrypted: i=1; AHgh+RqF34aIyTTb48zqfKh575gCmiRFpz9erhMXnXAh8TNp/KKIPQytvim9jUkq8YZ83D008GPyrl4=@lists.linux.dev X-Gm-Message-State: AFuF++lG2ZvumO0wcDzfxD6AM/bIjINEL3JmjX7of+0iaN6E5GkmuQ7r MqcmjThq5bVHISls5hGDR4XCiJp2cTA8ou2PhqUCVFoZsq0x2KHvw6q+SpRNLaCnjF4= X-Gm-Gg: AR+sD13gOzw97XIDuzmu0y4RWL7IAfIA05hojE/ROf3dw/wY1AnlXG3Z7+hdgrvtDrD Zh0BVkWro8QJQ82yJUVAfj89IWHFuv/1sMrqZt98RjlFhsm4acwaHSA3s0bPNkbHizSHNii9UvM QgajesAk1XQWr6mNrq+wF2MzgQO9g91PkMKyHvjNd7HpN58rLOL1E4mTj15YgZGHJGF4koIjxE0 8J9ar3uZsle1zT4rRdZhtAuX9O/cx6113Jq2S2laVndYVKMO4A5IzlxPKyT/UT5j7XvQfTrEz0/ f8ivqt1wf52UN0j7rC2JkA1WbyqwNpOcWaWDOQyTlsIEDmXy5rRLjV8/rD01pN+m5utT9zcHo1n gH69r3i251pFvoASTOfMuBMn/86wYYV/37HsBGC7pyK+ozobkMyrwG7UB0gtmO4BWXb1AYniPcK yW7OJo5mCPSJIgnVYcgDbeai6lnsbtlJB1HdblFW8ivxeCaSgKQrCQBSKuncNCXmxSBFCjEEnMH lc0u5v9XBU= X-Received: by 2002:a05:600c:8107:b0:49c:d26a:cf70 with SMTP id 5b1f17b1804b1-49cd26ad005mr330907835e9.15.1788264465295; Tue, 01 Sep 2026 05:07:45 -0700 (PDT) Received: from localhost (78-154-15-182.ip.btc-net.bg. [78.154.15.182]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-49cdce1a3fesm66474005e9.12.2026.09.01.05.07.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 01 Sep 2026 05:07:44 -0700 (PDT) From: Nikolay Aleksandrov To: netdev@vger.kernel.org Cc: idosch@nvidia.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, bridge@lists.linux.dev, Nikolay Aleksandrov Subject: [PATCH net-next 6/9] net: bridge: vlan: annotate lockless use of num_vlans Date: Tue, 1 Sep 2026 15:07:18 +0300 Message-ID: <20260901120721.747908-7-razor@blackwall.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260901120721.747908-1-razor@blackwall.org> References: <20260901120721.747908-1-razor@blackwall.org> Precedence: bulk X-Mailing-List: bridge@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Annotate data races around vlan group's num_vlans, it can be read lockless. Signed-off-by: Nikolay Aleksandrov --- net/bridge/br_netlink.c | 4 ++-- net/bridge/br_vlan.c | 10 +++++----- 2 files changed, 7 insertions(+), 7 deletions(-) diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c index 62ce96d9ba32..ae76df0de05a 100644 --- a/net/bridge/br_netlink.c +++ b/net/bridge/br_netlink.c @@ -81,7 +81,7 @@ static int br_get_num_vlan_infos(struct net_bridge_vlan_group *vg, return 0; if (filter_mask & RTEXT_FILTER_BRVLAN) - return vg->num_vlans; + return READ_ONCE(vg->num_vlans); rcu_read_lock(); num_vlans = __get_num_vlan_infos(vg, filter_mask); @@ -531,7 +531,7 @@ static int br_fill_ifinfo(struct sk_buff *skb, else vg = br_vlan_group_rcu(br); - if (!vg || !vg->num_vlans) { + if (!vg || !READ_ONCE(vg->num_vlans)) { rcu_read_unlock(); goto done; } diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c index 102792f20a5e..95187a607ec2 100644 --- a/net/bridge/br_vlan.c +++ b/net/bridge/br_vlan.c @@ -344,7 +344,7 @@ static int __vlan_add(struct net_bridge_vlan *v, u16 flags, goto out_filt; } } - vg->num_vlans++; + WRITE_ONCE(vg->num_vlans, vg->num_vlans + 1); } /* set the state before publishing */ @@ -367,7 +367,7 @@ static int __vlan_add(struct net_bridge_vlan *v, u16 flags, out_fdb_insert: if (br_vlan_should_use(v)) { br_fdb_find_delete_local(br, p, dev->dev_addr, v->vid); - vg->num_vlans--; + WRITE_ONCE(vg->num_vlans, vg->num_vlans - 1); } out_filt: @@ -417,7 +417,7 @@ static int __vlan_del(struct net_bridge_vlan *v) if (br_vlan_should_use(v)) { WRITE_ONCE(v->flags, v->flags & ~BRIDGE_VLAN_INFO_BRENTRY); - vg->num_vlans--; + WRITE_ONCE(vg->num_vlans, vg->num_vlans - 1); } if (masterv != v) { @@ -695,7 +695,7 @@ bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid) return true; vg = nbp_vlan_group_rcu(p); - if (!vg || !vg->num_vlans) + if (!vg || !READ_ONCE(vg->num_vlans)) return false; if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto) @@ -757,7 +757,7 @@ static int br_vlan_add_existing(struct net_bridge *br, refcount_inc(&vlan->refcnt); WRITE_ONCE(vlan->flags, vlan->flags | BRIDGE_VLAN_INFO_BRENTRY); - vg->num_vlans++; + WRITE_ONCE(vg->num_vlans, vg->num_vlans + 1); *changed = true; br_multicast_toggle_one_vlan(vlan, true); } -- 2.47.3