linux-kernel - drivers/net/ipa/ipa_qmi.c:128:14: warning: Value stored to 'ipa' during its initialization is never read [clang-analyzer-deadcode.DeadStores]

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Message-ID: <200de1bd-0f01-c334-ca18-43eed783dfac@intel.com>
Date:   Thu, 27 Jan 2022 15:16:21 +0800
From:   kernel test robot <yujie.liu@...el.com>
To:     Alex Elder <elder@...aro.org>
CC:     <llvm@...ts.linux.dev>, <kbuild-all@...ts.01.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: drivers/net/ipa/ipa_qmi.c:128:14: warning: Value stored to 'ipa'
 during its initialization is never read [clang-analyzer-deadcode.DeadStores]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   0280e3c58f92b2fe0e8fbbdf8d386449168de4a8
commit: 99e75a37bd0af8eb8a0560f48091672b1b6d9218 net: ipa: relax 64-bit build requirement
date:   10 months ago
config: arm-randconfig-c002-20220125 (https://download.01.org/0day-ci/archive/20220127/202201270925.F8g9FeNj-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 997e128e2a78f5a5434fc75997441ae1ee76f8a4)
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
         # install arm cross compiling tool for clang build
         # apt-get install binutils-arm-linux-gnueabi
         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=99e75a37bd0af8eb8a0560f48091672b1b6d9218
         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
         git fetch --no-tags linus master
         git checkout 99e75a37bd0af8eb8a0560f48091672b1b6d9218
         # save the config file to linux build tree
         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 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/ipa/ipa_qmi.c:128:14: warning: Value stored to 'ipa' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
            struct ipa *ipa = container_of(ipa_qmi, struct ipa, qmi);
                        ^~~

vim +/ipa +128 drivers/net/ipa/ipa_qmi.c

530f9216a9537b Alex Elder 2020-03-05  116
530f9216a9537b Alex Elder 2020-03-05  117  /* Determine whether everything is ready to start normal operation.
530f9216a9537b Alex Elder 2020-03-05  118   * We know everything (else) is ready when we know the IPA driver on
530f9216a9537b Alex Elder 2020-03-05  119   * the modem is ready, and the microcontroller is ready.
530f9216a9537b Alex Elder 2020-03-05  120   *
530f9216a9537b Alex Elder 2020-03-05  121   * When the modem boots (or reboots), the handshake sequence starts
530f9216a9537b Alex Elder 2020-03-05  122   * with the AP sending the modem an INIT_DRIVER request.  Within
530f9216a9537b Alex Elder 2020-03-05  123   * that request, the uc_loaded flag will be zero (false) for an
530f9216a9537b Alex Elder 2020-03-05  124   * initial boot, non-zero (true) for a subsequent (SSR) boot.
530f9216a9537b Alex Elder 2020-03-05  125   */
530f9216a9537b Alex Elder 2020-03-05  126  static void ipa_qmi_ready(struct ipa_qmi *ipa_qmi)
530f9216a9537b Alex Elder 2020-03-05  127  {
530f9216a9537b Alex Elder 2020-03-05 @128  	struct ipa *ipa = container_of(ipa_qmi, struct ipa, qmi);
530f9216a9537b Alex Elder 2020-03-05  129  	int ret;
530f9216a9537b Alex Elder 2020-03-05  130
530f9216a9537b Alex Elder 2020-03-05  131  	/* We aren't ready until the modem and microcontroller are */
530f9216a9537b Alex Elder 2020-03-05  132  	if (!ipa_qmi->modem_ready || !ipa_qmi->uc_ready)
530f9216a9537b Alex Elder 2020-03-05  133  		return;
530f9216a9537b Alex Elder 2020-03-05  134
530f9216a9537b Alex Elder 2020-03-05  135  	/* Send the indication message if it was requested */
530f9216a9537b Alex Elder 2020-03-05  136  	ipa_qmi_indication(ipa_qmi);
530f9216a9537b Alex Elder 2020-03-05  137
530f9216a9537b Alex Elder 2020-03-05  138  	/* The initial boot requires us to send the indication. */
530f9216a9537b Alex Elder 2020-03-05  139  	if (ipa_qmi->initial_boot) {
530f9216a9537b Alex Elder 2020-03-05  140  		if (!ipa_qmi->indication_sent)
530f9216a9537b Alex Elder 2020-03-05  141  			return;
530f9216a9537b Alex Elder 2020-03-05  142
530f9216a9537b Alex Elder 2020-03-05  143  		/* The initial modem boot completed successfully */
530f9216a9537b Alex Elder 2020-03-05  144  		ipa_qmi->initial_boot = false;
530f9216a9537b Alex Elder 2020-03-05  145  	}
530f9216a9537b Alex Elder 2020-03-05  146
530f9216a9537b Alex Elder 2020-03-05  147  	/* We're ready.  Start up normal operation */
530f9216a9537b Alex Elder 2020-03-05 @148  	ipa = container_of(ipa_qmi, struct ipa, qmi);
530f9216a9537b Alex Elder 2020-03-05  149  	ret = ipa_modem_start(ipa);
530f9216a9537b Alex Elder 2020-03-05  150  	if (ret)
530f9216a9537b Alex Elder 2020-03-05  151  		dev_err(&ipa->pdev->dev, "error %d starting modem\n", ret);
530f9216a9537b Alex Elder 2020-03-05  152  }
530f9216a9537b Alex Elder 2020-03-05  153

:::::: The code at line 128 was first introduced by commit
:::::: 530f9216a9537b58cdc2f967b5cd78f5dafb34c4 soc: qcom: ipa: AP/modem communications

:::::: TO: Alex Elder <elder@...aro.org>
:::::: CC: David S. Miller <davem@...emloft.net>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org