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Date: Sun, 30 Jan 2022 10:46:38 +0800
From: kernel test robot <yujie.liu@...el.com>
To: Anand Ashok Dumbre <anand.ashok.dumbre@...inx.com>
CC: <llvm@...ts.linux.dev>, <kbuild-all@...ts.01.org>,
"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
Jonathan Cameron <Jonathan.Cameron@...wei.com>,
Manish Narani <manish.narani@...inx.com>
Subject: drivers/iio/adc/xilinx-ams.c:1324:3: warning: Value stored to 'ret'
is never read [clang-analyzer-deadcode.DeadStores]
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 23a46422c56144939c091c76cf389aa863ce9c18
commit: d5c70627a79455154f5f636096abe6fe57510605 iio: adc: Add Xilinx AMS driver
date: 5 weeks ago
config: riscv-randconfig-c006-20220126 (https://download.01.org/0day-ci/archive/20220128/202201282049.dQhZXwBH-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 2a1b7aa016c0f4b5598806205bdfbab1ea2d92c4)
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 riscv cross compiling tool for clang build
# apt-get install binutils-riscv64-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d5c70627a79455154f5f636096abe6fe57510605
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout d5c70627a79455154f5f636096abe6fe57510605
# save the config file to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv clang-analyzer
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <yujie.liu@...el.com>
clang-analyzer warnings: (new ones prefixed by >>)
>> drivers/iio/adc/xilinx-ams.c:1324:3: warning: Value stored to 'ret' is never read [clang-analyzer-deadcode.DeadStores]
ret = -ENOMEM;
^ ~~~~~~~
vim +/ret +1324 drivers/iio/adc/xilinx-ams.c
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1253
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1254 static int ams_parse_firmware(struct iio_dev *indio_dev)
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1255 {
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1256 struct ams *ams = iio_priv(indio_dev);
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1257 struct iio_chan_spec *ams_channels, *dev_channels;
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1258 struct device *dev = indio_dev->dev.parent;
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1259 struct fwnode_handle *child = NULL;
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1260 struct fwnode_handle *fwnode = dev_fwnode(dev);
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1261 size_t ams_size, dev_size;
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1262 int ret, ch_cnt = 0, i, rising_off, falling_off;
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1263 unsigned int num_channels = 0;
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1264
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1265 ams_size = ARRAY_SIZE(ams_ps_channels) + ARRAY_SIZE(ams_pl_channels) +
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1266 ARRAY_SIZE(ams_ctrl_channels);
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1267
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1268 /* Initialize buffer for channel specification */
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1269 ams_channels = devm_kcalloc(dev, ams_size, sizeof(*ams_channels), GFP_KERNEL);
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1270 if (!ams_channels)
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1271 return -ENOMEM;
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1272
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1273 if (fwnode_device_is_available(fwnode)) {
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1274 ret = ams_init_module(indio_dev, fwnode, ams_channels);
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1275 if (ret < 0)
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1276 return ret;
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1277
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1278 num_channels += ret;
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1279 }
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1280
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1281 fwnode_for_each_child_node(fwnode, child) {
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1282 if (fwnode_device_is_available(child)) {
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1283 ret = ams_init_module(indio_dev, child, ams_channels + num_channels);
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1284 if (ret < 0) {
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1285 fwnode_handle_put(child);
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1286 return ret;
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1287 }
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1288
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1289 num_channels += ret;
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1290 }
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1291 }
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1292
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1293 for (i = 0; i < num_channels; i++) {
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1294 ams_channels[i].channel = ch_cnt++;
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1295
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1296 if (ams_channels[i].scan_index < AMS_CTRL_SEQ_BASE) {
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1297 /* set threshold to max and min for each channel */
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1298 falling_off =
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1299 ams_get_alarm_offset(ams_channels[i].scan_index,
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1300 IIO_EV_DIR_FALLING);
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1301 rising_off =
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1302 ams_get_alarm_offset(ams_channels[i].scan_index,
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1303 IIO_EV_DIR_RISING);
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1304 if (ams_channels[i].scan_index >= AMS_PS_SEQ_MAX) {
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1305 writel(AMS_ALARM_THR_MIN,
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1306 ams->pl_base + falling_off);
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1307 writel(AMS_ALARM_THR_MAX,
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1308 ams->pl_base + rising_off);
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1309 } else {
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1310 writel(AMS_ALARM_THR_MIN,
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1311 ams->ps_base + falling_off);
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1312 writel(AMS_ALARM_THR_MAX,
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1313 ams->ps_base + rising_off);
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1314 }
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1315 }
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1316 }
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1317
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1318 dev_size = array_size(sizeof(*dev_channels), num_channels);
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1319 if (dev_size == SIZE_MAX)
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1320 return -ENOMEM;
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1321
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1322 dev_channels = devm_krealloc(dev, ams_channels, dev_size, GFP_KERNEL);
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1323 if (!dev_channels)
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 @1324 ret = -ENOMEM;
'return -ENOMEM;' ?
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1325
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1326 indio_dev->channels = dev_channels;
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1327 indio_dev->num_channels = num_channels;
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1328
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1329 return 0;
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1330 }
d5c70627a79455 Anand Ashok Dumbre 2021-12-03 1331
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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