linux-kernel - drivers/net/ethernet/intel/i40e/i40e_main.c:4643:2: warning: Value stored to 'pf_q' is never read [clang-analyzer-deadcode.DeadStores]

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Message-ID: <b95a8286-e1a4-e71a-aea2-503e1bf9459e@intel.com>
Date:   Fri, 7 Jan 2022 11:05:41 +0800
From:   kernel test robot <yujie.liu@...el.com>
To:     Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
CC:     <llvm@...ts.linux.dev>, <kbuild-all@...ts.01.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Aleksandr Loktionov <aleksandr.loktionov@...el.com>
Subject: drivers/net/ethernet/intel/i40e/i40e_main.c:4643:2: warning: Value
 stored to 'pf_q' is never read [clang-analyzer-deadcode.DeadStores]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   c9e6606c7fe92b50a02ce51dda82586ebdf99b48
commit: 65662a8dcdd01342b71ee44234bcfd0162e195af i40e: Fix logic of disabling queues
date:   5 months ago
config: x86_64-randconfig-c007-20220101 (https://download.01.org/0day-ci/archive/20220104/202201040200.QGI49OIz-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c054402170cd8466683a20385befc0523aba3359)
reproduce (this is a W=1 build):
         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
         chmod +x ~/bin/make.cross
         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=65662a8dcdd01342b71ee44234bcfd0162e195af
         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
         git fetch --no-tags linus master
         git checkout 65662a8dcdd01342b71ee44234bcfd0162e195af
         # save the config file to linux build tree
         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 clang-analyzer

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>


clang-analyzer warnings: (new ones prefixed by >>)

 >> drivers/net/ethernet/intel/i40e/i40e_main.c:4643:2: warning: Value stored to 'pf_q' is never read [clang-analyzer-deadcode.DeadStores]
            pf_q = vsi->base_queue;
            ^      ~~~~~~~~~~~~~~~

vim +/pf_q +4643 drivers/net/ethernet/intel/i40e/i40e_main.c

65662a8dcdd013 Arkadiusz Kubalewski 2021-04-29  4616
3aa7b74dbeedfb Filip Sadowski       2016-10-11  4617  /**
3aa7b74dbeedfb Filip Sadowski       2016-10-11  4618   * i40e_vsi_stop_rings - Stop a VSI's rings
3aa7b74dbeedfb Filip Sadowski       2016-10-11  4619   * @vsi: the VSI being configured
3aa7b74dbeedfb Filip Sadowski       2016-10-11  4620   **/
3aa7b74dbeedfb Filip Sadowski       2016-10-11  4621  void i40e_vsi_stop_rings(struct i40e_vsi *vsi)
3aa7b74dbeedfb Filip Sadowski       2016-10-11  4622  {
65662a8dcdd013 Arkadiusz Kubalewski 2021-04-29  4623  	struct i40e_pf *pf = vsi->back;
65662a8dcdd013 Arkadiusz Kubalewski 2021-04-29  4624  	int pf_q, err, q_end;
65662a8dcdd013 Arkadiusz Kubalewski 2021-04-29  4625
3480756f2cb93c Jacob Keller         2017-04-13  4626  	/* When port TX is suspended, don't wait */
0da36b9774cc24 Jacob Keller         2017-04-19  4627  	if (test_bit(__I40E_PORT_SUSPENDED, vsi->back->state))
3480756f2cb93c Jacob Keller         2017-04-13  4628  		return i40e_vsi_stop_rings_no_wait(vsi);
3480756f2cb93c Jacob Keller         2017-04-13  4629
65662a8dcdd013 Arkadiusz Kubalewski 2021-04-29  4630  	q_end = vsi->base_queue + vsi->num_queue_pairs;
65662a8dcdd013 Arkadiusz Kubalewski 2021-04-29  4631  	for (pf_q = vsi->base_queue; pf_q < q_end; pf_q++)
65662a8dcdd013 Arkadiusz Kubalewski 2021-04-29  4632  		i40e_pre_tx_queue_cfg(&pf->hw, (u32)pf_q, false);
65662a8dcdd013 Arkadiusz Kubalewski 2021-04-29  4633
65662a8dcdd013 Arkadiusz Kubalewski 2021-04-29  4634  	for (pf_q = vsi->base_queue; pf_q < q_end; pf_q++) {
65662a8dcdd013 Arkadiusz Kubalewski 2021-04-29  4635  		err = i40e_control_wait_rx_q(pf, pf_q, false);
65662a8dcdd013 Arkadiusz Kubalewski 2021-04-29  4636  		if (err)
65662a8dcdd013 Arkadiusz Kubalewski 2021-04-29  4637  			dev_info(&pf->pdev->dev,
65662a8dcdd013 Arkadiusz Kubalewski 2021-04-29  4638  				 "VSI seid %d Rx ring %d dissable timeout\n",
65662a8dcdd013 Arkadiusz Kubalewski 2021-04-29  4639  				 vsi->seid, pf_q);
65662a8dcdd013 Arkadiusz Kubalewski 2021-04-29  4640  	}
65662a8dcdd013 Arkadiusz Kubalewski 2021-04-29  4641
65662a8dcdd013 Arkadiusz Kubalewski 2021-04-29  4642  	msleep(I40E_DISABLE_TX_GAP_MSEC);
65662a8dcdd013 Arkadiusz Kubalewski 2021-04-29 @4643  	pf_q = vsi->base_queue;
65662a8dcdd013 Arkadiusz Kubalewski 2021-04-29  4644  	for (pf_q = vsi->base_queue; pf_q < q_end; pf_q++)
65662a8dcdd013 Arkadiusz Kubalewski 2021-04-29  4645  		wr32(&pf->hw, I40E_QTX_ENA(pf_q), 0);
65662a8dcdd013 Arkadiusz Kubalewski 2021-04-29  4646
65662a8dcdd013 Arkadiusz Kubalewski 2021-04-29  4647  	i40e_vsi_wait_queues_disabled(vsi);
3aa7b74dbeedfb Filip Sadowski       2016-10-11  4648  }
3aa7b74dbeedfb Filip Sadowski       2016-10-11  4649

---
0-DAY CI Kernel Test Service, Intel Corporation
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