From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 DB248352FC2; Tue, 26 Aug 2025 14:43:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756219427; cv=none; b=sBMXb87zfdvNwszbXfwSeOpRp6Wn4FNp7uKmbFNnGRzTKB2PA1zWx0Emk3Hp1K/HOcgyJYfOgpABk6TsINxIJrQ8dSgS/TV5jzErZrRCYhlrk52GpVApCMUJ9rRkBdJKc8oUp5PHqYH2IzmMm7c8Q0eX5rs4O+E4VLekICIIGfw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756219427; c=relaxed/simple; bh=sTYwLo+jVaKAq3PJB5BO2CTBQ1fbQLu9Z+ejsWG2cbY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pzbctJUfdkstj4DwuhptVKrDUJL5HIm2aGLI4u4pjoy+L86sewkOXUoI1Ow6L3MrILdiYmf7qo5/kt58V1DUEQFhX8gxvi+VfMH9HsXSKlUdlr3CcEwOKUJaSyVMW/LwfbdzSl6FehxRxKX/iA44zQe/LVUIKlzqXLS/NFfKPpQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=YOgL7l30; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="YOgL7l30" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0F7D1C4CEF1; Tue, 26 Aug 2025 14:43:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1756219427; bh=sTYwLo+jVaKAq3PJB5BO2CTBQ1fbQLu9Z+ejsWG2cbY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YOgL7l30vXyI2ceX7bcmGMkB7UEgJCRIOzxgExT03SKjv2FfEeURDJOD3UdubkRpH L9o6KSJ9RZ69TQbSiIJ4zw5QKdkeA1MgnN1f5NLNnuLuestNJSVTf8iJPkpdUojiRU 5/47V+P2Ouyw2DwM2mB/PgPORq6Ly5Cjf62gnADM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Gerrard Tai , Cong Wang , Simon Horman , Jamal Hadi Salim , Paolo Abeni , Siddh Raman Pant Subject: [PATCH 5.4 377/403] sch_qfq: make qfq_qlen_notify() idempotent Date: Tue, 26 Aug 2025 13:11:43 +0200 Message-ID: <20250826110917.435503588@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250826110905.607690791@linuxfoundation.org> References: <20250826110905.607690791@linuxfoundation.org> User-Agent: quilt/0.68 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-Transfer-Encoding: 8bit 5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Cong Wang commit 55f9eca4bfe30a15d8656f915922e8c98b7f0728 upstream. qfq_qlen_notify() always deletes its class from its active list with list_del_init() _and_ calls qfq_deactivate_agg() when the whole list becomes empty. To make it idempotent, just skip everything when it is not in the active list. Also change other list_del()'s to list_del_init() just to be extra safe. Reported-by: Gerrard Tai Signed-off-by: Cong Wang Reviewed-by: Simon Horman Link: https://patch.msgid.link/20250403211033.166059-5-xiyou.wangcong@gmail.com Acked-by: Jamal Hadi Salim Signed-off-by: Paolo Abeni Signed-off-by: Siddh Raman Pant Signed-off-by: Greg Kroah-Hartman --- net/sched/sch_qfq.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) --- a/net/sched/sch_qfq.c +++ b/net/sched/sch_qfq.c @@ -348,7 +348,7 @@ static void qfq_deactivate_class(struct struct qfq_aggregate *agg = cl->agg; - list_del(&cl->alist); /* remove from RR queue of the aggregate */ + list_del_init(&cl->alist); /* remove from RR queue of the aggregate */ if (list_empty(&agg->active)) /* agg is now inactive */ qfq_deactivate_agg(q, agg); } @@ -482,6 +482,7 @@ static int qfq_change_class(struct Qdisc cl->common.classid = classid; cl->deficit = lmax; + INIT_LIST_HEAD(&cl->alist); cl->qdisc = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, classid, NULL); @@ -1001,7 +1002,7 @@ static struct sk_buff *agg_dequeue(struc cl->deficit -= (int) len; if (cl->qdisc->q.qlen == 0) /* no more packets, remove from list */ - list_del(&cl->alist); + list_del_init(&cl->alist); else if (cl->deficit < qdisc_pkt_len(cl->qdisc->ops->peek(cl->qdisc))) { cl->deficit += agg->lmax; list_move_tail(&cl->alist, &agg->active); @@ -1433,6 +1434,8 @@ static void qfq_qlen_notify(struct Qdisc struct qfq_sched *q = qdisc_priv(sch); struct qfq_class *cl = (struct qfq_class *)arg; + if (list_empty(&cl->alist)) + return; qfq_deactivate_class(q, cl); }