[ogabbay:habanalabs-next 47/47] drivers/misc/habanalabs/common/habanalabs_drv.c:138:41: sparse: sparse: Using plain integer as NULL pointer
From: kernel test robot
Date: Mon May 09 2022 - 13:14:57 EST
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@xxxxxxxxx/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@xxxxxxxxx>
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
--
0-DAY CI Kernel Test Service
https://01.org/lkp