From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 480FE223DC6; Sat, 30 May 2026 18:11:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780164702; cv=none; b=d8YIh4VCwwYn7qviiboeds6HDYrjFK+L5T3Ayydi0v87Ea5IoFi9tl35/BlQ3VCTYQJRhiF0i5tT8+Y7R0fOxxwYmamQwKLaBcYknhg/1kItchZtviLKoP/Z1QJ91pZ3Ga3QB4ZhdGYitqn2FfslLFn8nGgdR8wDnSIa40wY8vs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780164702; c=relaxed/simple; bh=ZjUtj/TyiUuVmEcGwoYw17qMqGnyZQ1klWvO3aQ0pIs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=qv0MFYNTxbcwrEsDAGQi39wGU6eOlJDqDhilsfYXWKq+uj1sIpLOOk3sK74vxTv7QjdHnVCARPtAdRWgd2fkF7u9W9MNlMtRGjBuDXpEODuINIvCd+iSrxiyobFhKv/YaVy7KkaA+3w9Swk0Bd6tvS6qefcbexupJAboF8SvIdY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=E6ebqUjI; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="E6ebqUjI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8BFB51F00893; Sat, 30 May 2026 18:11:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1780164701; bh=TGweGD7cGsD1i2sV3LyJjrNXPy7cU9nIU1AYnY7EIHI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=E6ebqUjIu3NYgzszep68/Ws1F+xKxSwFYpRjVnIu4kpduM9d2ZT+doBHnYknjtaSu St9bsb0Ga80ErNq9J32aKPhk+KjOBXYQyWjziwpAd7N4sp2dtMugNwIbGweAak5ycB n7sykmLXMlxK0jf3nu92/3GXFn02ITnxR2OECRak= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Eric Dumazet , =?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.15 634/776] net/sched: sch_cake: annotate data-races in cake_dump_stats() (V) Date: Sat, 30 May 2026 18:05:48 +0200 Message-ID: <20260530160256.349697284@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260530160240.228940103@linuxfoundation.org> References: <20260530160240.228940103@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet [ Upstream commit a6c95b833dc17e84d16a8ac0f40fd0931616a52d ] cake_dump_stats() runs without qdisc spinlock being held. In this final patch, I add READ_ONCE()/WRITE_ONCE() annotations for cparams.target and cparams.interval. Fixes: 046f6fd5daef ("sched: Add Common Applications Kept Enhanced (cake) qdisc") Signed-off-by: Eric Dumazet Acked-by: "Toke Høiland-Jørgensen" Link: https://patch.msgid.link/20260427083606.459355-6-edumazet@google.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/sched/sch_cake.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/net/sched/sch_cake.c b/net/sched/sch_cake.c index 87578d05a0925..46b93e30b60be 100644 --- a/net/sched/sch_cake.c +++ b/net/sched/sch_cake.c @@ -2313,10 +2313,11 @@ static void cake_set_rate(struct cake_tin_data *b, u64 rate, u32 mtu, byte_target_ns = (byte_target * rate_ns) >> rate_shft; - b->cparams.target = max((byte_target_ns * 3) / 2, target_ns); - b->cparams.interval = max(rtt_est_ns + - b->cparams.target - target_ns, - b->cparams.target * 2); + WRITE_ONCE(b->cparams.target, + max((byte_target_ns * 3) / 2, target_ns)); + WRITE_ONCE(b->cparams.interval, + max(rtt_est_ns + b->cparams.target - target_ns, + b->cparams.target * 2)); b->cparams.mtu_time = byte_target_ns; b->cparams.p_inc = 1 << 24; /* 1/256 */ b->cparams.p_dec = 1 << 20; /* 1/4096 */ @@ -2933,9 +2934,9 @@ static int cake_dump_stats(struct Qdisc *sch, struct gnet_dump *d) PUT_TSTAT_U32(BACKLOG_BYTES, b->tin_backlog); PUT_TSTAT_U32(TARGET_US, - ktime_to_us(ns_to_ktime(b->cparams.target))); + ktime_to_us(ns_to_ktime(READ_ONCE(b->cparams.target)))); PUT_TSTAT_U32(INTERVAL_US, - ktime_to_us(ns_to_ktime(b->cparams.interval))); + ktime_to_us(ns_to_ktime(READ_ONCE(b->cparams.interval)))); PUT_TSTAT_U32(SENT_PACKETS, b->packets); PUT_TSTAT_U32(DROPPED_PACKETS, b->tin_dropped); -- 2.53.0