[ogabbay:habanalabs-next 47/47] drivers/misc/habanalabs/common/habanalabs_drv.c:138:41: sparse: sparse: Using plain integer as NULL pointer

[ogabbay:habanalabs-next 47/47] drivers/misc/habanalabs/common/habanalabs_drv.c:138:41: sparse: sparse: Using plain integer as NULL pointer

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/ogabbay/linux.git habanalabs-next
head:   20c59ac5d71e766235e74f353b74e60facd733c8
commit: 20c59ac5d71e766235e74f353b74e60facd733c8 [47/47] habanalabs: add support for notification via eventfd
config: alpha-randconfig-s031-20220509 (https://download.01.org/0day-ci/archive/20220510/202205100106.LlBrBvTd-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 11.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/ogabbay/linux.git/commit/?id=20c59ac5d71e766235e74f353b74e60facd733c8
        git remote add ogabbay https://git.kernel.org/pub/scm/linux/kernel/git/ogabbay/linux.git
        git fetch --no-tags ogabbay habanalabs-next
        git checkout 20c59ac5d71e766235e74f353b74e60facd733c8
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=alpha SHELL=/bin/bash drivers/misc/

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


sparse warnings: (new ones prefixed by >>)
>> drivers/misc/habanalabs/common/habanalabs_drv.c:138:41: sparse: sparse: Using plain integer as NULL pointer
   drivers/misc/habanalabs/common/habanalabs_drv.c:250:41: sparse: sparse: Using plain integer as NULL pointer
--
>> drivers/misc/habanalabs/common/habanalabs_ioctl.c:650:49: sparse: sparse: Using plain integer as NULL pointer
   drivers/misc/habanalabs/common/habanalabs_ioctl.c:668:41: sparse: sparse: Using plain integer as NULL pointer
--
>> drivers/misc/habanalabs/common/device.c:291:49: sparse: sparse: Using plain integer as NULL pointer
   drivers/misc/habanalabs/common/device.c:369:49: sparse: sparse: Using plain integer as NULL pointer

vim +138 drivers/misc/habanalabs/common/habanalabs_drv.c

   104	
   105	/*
   106	 * hl_device_open - open function for habanalabs device
   107	 *
   108	 * @inode: pointer to inode structure
   109	 * @filp: pointer to file structure
   110	 *
   111	 * Called when process opens an habanalabs device.
   112	 */
   113	int hl_device_open(struct inode *inode, struct file *filp)
   114	{
   115		enum hl_device_status status;
   116		struct hl_device *hdev;
   117		struct hl_fpriv *hpriv;
   118		int rc;
   119	
   120		mutex_lock(&hl_devs_idr_lock);
   121		hdev = idr_find(&hl_devs_idr, iminor(inode));
   122		mutex_unlock(&hl_devs_idr_lock);
   123	
   124		if (!hdev) {
   125			pr_err("Couldn't find device %d:%d\n",
   126				imajor(inode), iminor(inode));
   127			return -ENXIO;
   128		}
   129	
   130		hpriv = kzalloc(sizeof(*hpriv), GFP_KERNEL);
   131		if (!hpriv)
   132			return -ENOMEM;
   133	
   134		hpriv->hdev = hdev;
   135		filp->private_data = hpriv;
   136		hpriv->filp = filp;
   137		hpriv->notifier_event.events_mask = 0;
 > 138		hpriv->notifier_event.eventfd = 0;
   139	
   140		mutex_init(&hpriv->notifier_event.lock);
   141		mutex_init(&hpriv->restore_phase_mutex);
   142		kref_init(&hpriv->refcount);
   143		nonseekable_open(inode, filp);
   144	
   145		hl_ctx_mgr_init(&hpriv->ctx_mgr);
   146		hl_mem_mgr_init(hpriv->hdev->dev, &hpriv->mem_mgr);
   147	
   148		hpriv->taskpid = get_task_pid(current, PIDTYPE_PID);
   149	
   150		mutex_lock(&hdev->fpriv_list_lock);
   151	
   152		if (!hl_device_operational(hdev, &status)) {
   153			dev_err_ratelimited(hdev->dev,
   154				"Can't open %s because it is %s\n",
   155				dev_name(hdev->dev), hdev->status[status]);
   156	
   157			if (status == HL_DEVICE_STATUS_IN_RESET)
   158				rc = -EAGAIN;
   159			else
   160				rc = -EPERM;
   161	
   162			goto out_err;
   163		}
   164	
   165		if (hdev->is_in_dram_scrub) {
   166			dev_dbg_ratelimited(hdev->dev,
   167				"Can't open %s during dram scrub\n",
   168				dev_name(hdev->dev));
   169			rc = -EAGAIN;
   170			goto out_err;
   171		}
   172	
   173		if (hdev->compute_ctx_in_release) {
   174			dev_dbg_ratelimited(hdev->dev,
   175				"Can't open %s because another user is still releasing it\n",
   176				dev_name(hdev->dev));
   177			rc = -EAGAIN;
   178			goto out_err;
   179		}
   180	
   181		if (hdev->is_compute_ctx_active) {
   182			dev_dbg_ratelimited(hdev->dev,
   183				"Can't open %s because another user is working on it\n",
   184				dev_name(hdev->dev));
   185			rc = -EBUSY;
   186			goto out_err;
   187		}
   188	
   189		rc = hl_ctx_create(hdev, hpriv);
   190		if (rc) {
   191			dev_err(hdev->dev, "Failed to create context %d\n", rc);
   192			goto out_err;
   193		}
   194	
   195		list_add(&hpriv->dev_node, &hdev->fpriv_list);
   196		mutex_unlock(&hdev->fpriv_list_lock);
   197	
   198		hl_debugfs_add_file(hpriv);
   199	
   200		atomic_set(&hdev->last_error.cs_write_disable, 0);
   201		atomic_set(&hdev->last_error.razwi_write_disable, 0);
   202	
   203		hdev->open_counter++;
   204		hdev->last_successful_open_jif = jiffies;
   205		hdev->last_successful_open_ktime = ktime_get();
   206	
   207		return 0;
   208	
   209	out_err:
   210		mutex_unlock(&hdev->fpriv_list_lock);
   211		hl_mem_mgr_fini(&hpriv->mem_mgr);
   212		hl_ctx_mgr_fini(hpriv->hdev, &hpriv->ctx_mgr);
   213		filp->private_data = NULL;
   214		mutex_destroy(&hpriv->restore_phase_mutex);
   215		mutex_destroy(&hpriv->notifier_event.lock);
   216		put_pid(hpriv->taskpid);
   217	
   218		kfree(hpriv);
   219	
   220		return rc;
   221	}
   222	

-- 
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