linux-kernel - Re: [PATCH v2 02/16] soc: qcom: apr: make code more reuseable

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Date:   Thu, 15 Jul 2021 04:36:52 +0800
From:   kernel test robot <lkp@...el.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        bjorn.andersson@...aro.org, broonie@...nel.org, robh@...nel.org
Cc:     clang-built-linux@...glegroups.com, kbuild-all@...ts.01.org,
        plai@...eaurora.org, tiwai@...e.de, devicetree@...r.kernel.org,
        perex@...ex.cz, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, lgirdwood@...il.com
Subject: Re: [PATCH v2 02/16] soc: qcom: apr: make code more reuseable

Hi Srinivas,

I love your patch! Perhaps something to improve:

[auto build test WARNING on asoc/for-next]
[also build test WARNING on robh/for-next sound/for-next linus/master v5.14-rc1 next-20210714]
[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]

url:    https://github.com/0day-ci/linux/commits/Srinivas-Kandagatla/ASoC-qcom-Add-AudioReach-support/20210714-233339
base:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next
config: mips-randconfig-r004-20210714 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d69635ed9ecf36fd0ca85906bfde17949671cbe)
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 mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://github.com/0day-ci/linux/commit/16cc55dede1767dd253072173a72dcc8c7a88a34
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Srinivas-Kandagatla/ASoC-qcom-Add-AudioReach-support/20210714-233339
        git checkout 16cc55dede1767dd253072173a72dcc8c7a88a34
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips 

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

All warnings (new ones prefixed by >>):

>> drivers/soc/qcom/apr.c:446:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
           if (of_device_is_compatible(dev->of_node, "qcom,apr")) {
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/soc/qcom/apr.c:451:6: note: uninitialized use occurs here
           if (ret) {
               ^~~
   drivers/soc/qcom/apr.c:446:2: note: remove the 'if' if its condition is always true
           if (of_device_is_compatible(dev->of_node, "qcom,apr")) {
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/soc/qcom/apr.c:440:9: note: initialize the variable 'ret' to silence this warning
           int ret;
                  ^
                   = 0
   1 warning generated.


vim +446 drivers/soc/qcom/apr.c

   435	
   436	static int apr_probe(struct rpmsg_device *rpdev)
   437	{
   438		struct device *dev = &rpdev->dev;
   439		struct packet_router *apr;
   440		int ret;
   441	
   442		apr = devm_kzalloc(dev, sizeof(*apr), GFP_KERNEL);
   443		if (!apr)
   444			return -ENOMEM;
   445	
 > 446		if (of_device_is_compatible(dev->of_node, "qcom,apr")) {
   447			ret = of_property_read_u32(dev->of_node, "qcom,apr-domain", &apr->dest_domain_id);
   448			apr->type = PR_TYPE_APR;
   449		}
   450	
   451		if (ret) {
   452			dev_err(dev, "Domain ID not specified in DT\n");
   453			return ret;
   454		}
   455	
   456		dev_set_drvdata(dev, apr);
   457		apr->ch = rpdev->ept;
   458		apr->dev = dev;
   459		apr->rxwq = create_singlethread_workqueue("qcom_apr_rx");
   460		if (!apr->rxwq) {
   461			dev_err(apr->dev, "Failed to start Rx WQ\n");
   462			return -ENOMEM;
   463		}
   464		INIT_WORK(&apr->rx_work, apr_rxwq);
   465	
   466		apr->pdr = pdr_handle_alloc(apr_pd_status, apr);
   467		if (IS_ERR(apr->pdr)) {
   468			dev_err(dev, "Failed to init PDR handle\n");
   469			ret = PTR_ERR(apr->pdr);
   470			goto destroy_wq;
   471		}
   472	
   473		INIT_LIST_HEAD(&apr->rx_list);
   474		spin_lock_init(&apr->rx_lock);
   475		spin_lock_init(&apr->svcs_lock);
   476		idr_init(&apr->svcs_idr);
   477	
   478		ret = of_apr_add_pd_lookups(dev);
   479		if (ret)
   480			goto handle_release;
   481	
   482		of_register_apr_devices(dev, NULL);
   483	
   484		return 0;
   485	
   486	handle_release:
   487		pdr_handle_release(apr->pdr);
   488	destroy_wq:
   489		destroy_workqueue(apr->rxwq);
   490		return ret;
   491	}
   492	

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

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