netdev - stable 5.15 backport: sch_*: make *_qlen

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Message-ID: <87960e35-5b7b-4b7e-9bba-50db6292cd5b@hauke-m.de>
Date: Thu, 7 Aug 2025 19:44:29 +0200
From: Hauke Mehrtens <hauke@...ke-m.de>
To: stable@...r.kernel.org, Greg KH <gregkh@...uxfoundation.org>
Cc: Lion Ackermann <nnamrec@...il.com>, Jamal Hadi Salim <jhs@...atatu.com>,
 netdev@...r.kernel.org
Subject: stable 5.15 backport: sch_*: make *_qlen_notify() idempotent

Hi,

Kernel 5.15.189 is showing a warning caused by:
commit e269f29e9395527bc00c213c6b15da04ebb35070
Author: Lion Ackermann <nnamrec@...il.com>
Date:   Mon Jun 30 15:27:30 2025 +0200
      net/sched: Always pass notifications when child class becomes empty
      [ Upstream commit 103406b38c600fec1fe375a77b27d87e314aea09 ]

See here for details: https://www.spinics.net/lists/netdev/msg1113109.html

To fix this please backport the following 4 commits to 5.15 stable:

commit 5ba8b837b522d7051ef81bacf3d95383ff8edce5
Author: Cong Wang <xiyou.wangcong@...il.com>
Date:   Thu Apr 3 14:10:23 2025 -0700

     sch_htb: make htb_qlen_notify() idempotent


commit df008598b3a00be02a8051fde89ca0fbc416bd55
Author: Cong Wang <xiyou.wangcong@...il.com>
Date:   Thu Apr 3 14:10:24 2025 -0700

     sch_drr: make drr_qlen_notify() idempotent


commit 51eb3b65544c9efd6a1026889ee5fb5aa62da3bb
Author: Cong Wang <xiyou.wangcong@...il.com>
Date:   Thu Apr 3 14:10:25 2025 -0700

     sch_hfsc: make hfsc_qlen_notify() idempotent


commit 55f9eca4bfe30a15d8656f915922e8c98b7f0728
Author: Cong Wang <xiyou.wangcong@...il.com>
Date:   Thu Apr 3 14:10:26 2025 -0700

     sch_qfq: make qfq_qlen_notify() idempotent


Kernel 6.1 stable already contains them. Kernel 5.10 stable does not 
contain the patch which causes problems.

Hauke