netdev - Re: [PATCH] net: Revert tx queue length on partial failure in dev_qdisc_change_tx_queue

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Message-ID: <202507232358.OuGr01a5-lkp@intel.com>
Date: Wed, 23 Jul 2025 23:52:00 +0800
From: kernel test robot <lkp@...el.com>
To: Suchit Karunakaran <suchitkarunakaran@...il.com>, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
	horms@...nel.org, jhs@...atatu.com, xiyou.wangcong@...il.com,
	jiri@...nulli.us, sdf@...ichev.me, kuniyu@...gle.com,
	aleksander.lobakin@...el.com, netdev@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev, skhan@...uxfoundation.org,
	linux-kernel-mentees@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Suchit Karunakaran <suchitkarunakaran@...il.com>
Subject: Re: [PATCH] net: Revert tx queue length on partial failure in
 dev_qdisc_change_tx_queue_len()

Hi Suchit,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net-next/main]
[also build test WARNING on net/main linus/master horms-ipvs/master v6.16-rc7 next-20250723]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Suchit-Karunakaran/net-Revert-tx-queue-length-on-partial-failure-in-dev_qdisc_change_tx_queue_len/20250722-151746
base:   net-next/main
patch link:    https://lore.kernel.org/r/20250722071508.12497-1-suchitkarunakaran%40gmail.com
patch subject: [PATCH] net: Revert tx queue length on partial failure in dev_qdisc_change_tx_queue_len()
config: parisc-randconfig-r072-20250723 (https://download.01.org/0day-ci/archive/20250723/202507232358.OuGr01a5-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 9.5.0

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202507232358.OuGr01a5-lkp@intel.com/

smatch warnings:
net/sched/sch_generic.c:1465 dev_qdisc_change_tx_queue_len() warn: always true condition '(i >= 0) => (0-u32max >= 0)'
net/sched/sch_generic.c:1465 dev_qdisc_change_tx_queue_len() warn: always true condition '(i >= 0) => (0-u32max >= 0)'

vim +1465 net/sched/sch_generic.c

  1447	
  1448	int dev_qdisc_change_tx_queue_len(struct net_device *dev, unsigned int old_len)
  1449	{
  1450		bool up = dev->flags & IFF_UP;
  1451		unsigned int i;
  1452		int ret = 0;
  1453	
  1454		if (up)
  1455			dev_deactivate(dev);
  1456	
  1457		for (i = 0; i < dev->num_tx_queues; i++) {
  1458			ret = qdisc_change_tx_queue_len(dev, &dev->_tx[i]);
  1459			if (ret)
  1460				break;
  1461		}
  1462	
  1463		if (ret) {
  1464			dev->tx_queue_len = old_len;
> 1465			while (i >= 0) {
  1466				qdisc_change_tx_queue_len(dev, &dev->_tx[i]);
  1467				i--;
  1468			}
  1469		}
  1470	
  1471		if (up)
  1472			dev_activate(dev);
  1473		return ret;
  1474	}
  1475	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki