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SubjectRe: [PATCH] iio: magnetometer: Add support for PNI RM3100 9-axis magnetometer
Hi Song,

I love your patch! Perhaps something to improve:

url: https://github.com/0day-ci/linux/commits/Song-Qiang/iio-magnetometer-Add-support-for-PNI-RM3100-9-axis-magnetometer/20180920-215124
base: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg

smatch warnings:
drivers/iio/magnetometer/rm3100-core.c:235 rm3100_set_samp_freq() warn: inconsistent returns 'mutex:&data->lock'.
Locked on: line 206
Unlocked on: line 194
drivers/iio/magnetometer/rm3100-core.c:319 rm3100_trigger_handler() warn: inconsistent returns 'mutex:&data->lock'.
Locked on: line 310
Unlocked on: line 319

# https://github.com/0day-ci/linux/commit/0345472c15bab336397b25a25eb76a9f8586faf0
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout 0345472c15bab336397b25a25eb76a9f8586faf0
vim +235 drivers/iio/magnetometer/rm3100-core.c

0345472c Song Qiang 2018-09-20 183
0345472c Song Qiang 2018-09-20 184 static int rm3100_set_samp_freq(struct rm3100_data *data, int val, int val2)
0345472c Song Qiang 2018-09-20 185 {
0345472c Song Qiang 2018-09-20 186 struct regmap *regmap = data->regmap;
0345472c Song Qiang 2018-09-20 187 int cycle_count;
0345472c Song Qiang 2018-09-20 188 int ret;
0345472c Song Qiang 2018-09-20 189 int i;
0345472c Song Qiang 2018-09-20 190
0345472c Song Qiang 2018-09-20 191 /* All cycle count registers use the same value. */
0345472c Song Qiang 2018-09-20 192 ret = regmap_read(regmap, RM_REG_CCXL, &cycle_count);
0345472c Song Qiang 2018-09-20 193 if (cycle_count < 0)
0345472c Song Qiang 2018-09-20 194 return cycle_count;
0345472c Song Qiang 2018-09-20 195
0345472c Song Qiang 2018-09-20 196 for (i = 0; i < RM_SAMP_NUM; i++) {
0345472c Song Qiang 2018-09-20 197 if (val == rm3100_samp_rates[i][0] &&
0345472c Song Qiang 2018-09-20 198 val2 == rm3100_samp_rates[i][1])
0345472c Song Qiang 2018-09-20 199 break;
0345472c Song Qiang 2018-09-20 200 }
0345472c Song Qiang 2018-09-20 201
0345472c Song Qiang 2018-09-20 202 if (i != RM_SAMP_NUM) {
0345472c Song Qiang 2018-09-20 203 mutex_lock(&data->lock);
^^^^^^^^^^^^^^^^^^^^^^^
0345472c Song Qiang 2018-09-20 204 ret = regmap_write(regmap, RM_REG_TMRC, i + RM_TMRC_OFFSET);
0345472c Song Qiang 2018-09-20 205 if (ret < 0)
0345472c Song Qiang 2018-09-20 206 return ret;
^^^^^^^^^^
goto unlock; there are a bunch of these.

0345472c Song Qiang 2018-09-20 207
0345472c Song Qiang 2018-09-20 208 /* Checking if cycle count registers need changing. */
0345472c Song Qiang 2018-09-20 209 if (val == 600 && cycle_count == 200) {
0345472c Song Qiang 2018-09-20 210 for (i = 0; i < 3; i++) {
0345472c Song Qiang 2018-09-20 211 regmap_write(regmap, RM_REG_CCXL + 2 * i, 100);
0345472c Song Qiang 2018-09-20 212 if (ret < 0)
0345472c Song Qiang 2018-09-20 213 return ret;
0345472c Song Qiang 2018-09-20 214 }
0345472c Song Qiang 2018-09-20 215 } else if (val != 600 && cycle_count == 100) {
0345472c Song Qiang 2018-09-20 216 for (i = 0; i < 3; i++) {
0345472c Song Qiang 2018-09-20 217 regmap_write(regmap, RM_REG_CCXL + 2 * i, 200);
0345472c Song Qiang 2018-09-20 218 if (ret < 0)
0345472c Song Qiang 2018-09-20 219 return ret;
0345472c Song Qiang 2018-09-20 220 }
0345472c Song Qiang 2018-09-20 221 }
0345472c Song Qiang 2018-09-20 222 /* Writing TMRC registers requires CMM reset. */
0345472c Song Qiang 2018-09-20 223 ret = regmap_write(regmap, RM_REG_CMM, 0);
0345472c Song Qiang 2018-09-20 224 if (ret < 0)
0345472c Song Qiang 2018-09-20 225 return ret;
0345472c Song Qiang 2018-09-20 226 ret = regmap_write(regmap, RM_REG_CMM, RM_CMM_PMX |
0345472c Song Qiang 2018-09-20 227 RM_CMM_PMY | RM_CMM_PMZ | RM_CMM_START);
0345472c Song Qiang 2018-09-20 228 if (ret < 0)
0345472c Song Qiang 2018-09-20 229 return ret;
0345472c Song Qiang 2018-09-20 230 mutex_unlock(&data->lock);
0345472c Song Qiang 2018-09-20 231
0345472c Song Qiang 2018-09-20 232 data->conversion_time = rm3100_samp_rates[i][2] + 3000;
0345472c Song Qiang 2018-09-20 233 return 0;
0345472c Song Qiang 2018-09-20 234 }
0345472c Song Qiang 2018-09-20 @235 return -EINVAL;
0345472c Song Qiang 2018-09-20 236 }
0345472c Song Qiang 2018-09-20 237
0345472c Song Qiang 2018-09-20 238 static int rm3100_read_raw(struct iio_dev *indio_dev,
0345472c Song Qiang 2018-09-20 239 const struct iio_chan_spec *chan,
0345472c Song Qiang 2018-09-20 240 int *val, int *val2, long mask)
0345472c Song Qiang 2018-09-20 241 {
0345472c Song Qiang 2018-09-20 242 struct rm3100_data *data = iio_priv(indio_dev);
0345472c Song Qiang 2018-09-20 243 int ret;
0345472c Song Qiang 2018-09-20 244
0345472c Song Qiang 2018-09-20 245 switch (mask) {
0345472c Song Qiang 2018-09-20 246 case IIO_CHAN_INFO_RAW:
0345472c Song Qiang 2018-09-20 247 ret = iio_device_claim_direct_mode(indio_dev);
0345472c Song Qiang 2018-09-20 248 if (ret < 0)
0345472c Song Qiang 2018-09-20 249 return ret;
0345472c Song Qiang 2018-09-20 250 ret = rm3100_read_mag(data, chan->scan_index, val);
0345472c Song Qiang 2018-09-20 251 iio_device_release_direct_mode(indio_dev);
0345472c Song Qiang 2018-09-20 252
0345472c Song Qiang 2018-09-20 253 return ret;
0345472c Song Qiang 2018-09-20 254 case IIO_CHAN_INFO_SAMP_FREQ:
0345472c Song Qiang 2018-09-20 255 return ret = rm3100_get_samp_freq(data, val, val2);
0345472c Song Qiang 2018-09-20 256 default:
0345472c Song Qiang 2018-09-20 257 return -EINVAL;
0345472c Song Qiang 2018-09-20 258 }
0345472c Song Qiang 2018-09-20 259 }
0345472c Song Qiang 2018-09-20 260
0345472c Song Qiang 2018-09-20 261 static int rm3100_write_raw(struct iio_dev *indio_dev,
0345472c Song Qiang 2018-09-20 262 struct iio_chan_spec const *chan,
0345472c Song Qiang 2018-09-20 263 int val, int val2, long mask)
0345472c Song Qiang 2018-09-20 264 {
0345472c Song Qiang 2018-09-20 265 struct rm3100_data *data = iio_priv(indio_dev);
0345472c Song Qiang 2018-09-20 266 int ret;
0345472c Song Qiang 2018-09-20 267
0345472c Song Qiang 2018-09-20 268 switch (mask) {
0345472c Song Qiang 2018-09-20 269 case IIO_CHAN_INFO_SAMP_FREQ:
0345472c Song Qiang 2018-09-20 270 ret = rm3100_set_samp_freq(data, val, val2);
0345472c Song Qiang 2018-09-20 271 if (ret < 0)
0345472c Song Qiang 2018-09-20 272 return ret;
0345472c Song Qiang 2018-09-20 273 return 0;
0345472c Song Qiang 2018-09-20 274 default:
0345472c Song Qiang 2018-09-20 275 return -EINVAL;
0345472c Song Qiang 2018-09-20 276 }
0345472c Song Qiang 2018-09-20 277
0345472c Song Qiang 2018-09-20 278 }
0345472c Song Qiang 2018-09-20 279
0345472c Song Qiang 2018-09-20 280 static const struct iio_info rm3100_info = {
0345472c Song Qiang 2018-09-20 281 .read_raw = rm3100_read_raw,
0345472c Song Qiang 2018-09-20 282 .write_raw = rm3100_write_raw,
0345472c Song Qiang 2018-09-20 283 };
0345472c Song Qiang 2018-09-20 284
0345472c Song Qiang 2018-09-20 285 static irqreturn_t rm3100_trigger_handler(int irq, void *p)
0345472c Song Qiang 2018-09-20 286 {
0345472c Song Qiang 2018-09-20 287 struct iio_poll_func *pf = p;
0345472c Song Qiang 2018-09-20 288 struct iio_dev *indio_dev = pf->indio_dev;
0345472c Song Qiang 2018-09-20 289 struct rm3100_data *data = iio_priv(indio_dev);
0345472c Song Qiang 2018-09-20 290 struct regmap *regmap = data->regmap;
0345472c Song Qiang 2018-09-20 291 u8 *buffer;
0345472c Song Qiang 2018-09-20 292 int ret;
0345472c Song Qiang 2018-09-20 293 int i;
0345472c Song Qiang 2018-09-20 294
0345472c Song Qiang 2018-09-20 295 buffer = devm_kzalloc(data->dev, indio_dev->scan_bytes, GFP_KERNEL);
0345472c Song Qiang 2018-09-20 296 if (!buffer)
0345472c Song Qiang 2018-09-20 297 goto done;
0345472c Song Qiang 2018-09-20 298
0345472c Song Qiang 2018-09-20 299 mutex_lock(&data->lock);
0345472c Song Qiang 2018-09-20 300 ret = rm3100_wait_measurement(data);
0345472c Song Qiang 2018-09-20 301 if (ret < 0) {
0345472c Song Qiang 2018-09-20 302 mutex_unlock(&data->lock);
0345472c Song Qiang 2018-09-20 303 goto done;
0345472c Song Qiang 2018-09-20 304 }
0345472c Song Qiang 2018-09-20 305
0345472c Song Qiang 2018-09-20 306 for (i = 0; i < 3; i++) {
0345472c Song Qiang 2018-09-20 307 ret = regmap_bulk_read(regmap, RM_REG_MX2 + 3 * i,
0345472c Song Qiang 2018-09-20 308 buffer + 4 * i, 3);
0345472c Song Qiang 2018-09-20 309 if (ret < 0)
0345472c Song Qiang 2018-09-20 310 return ret;
0345472c Song Qiang 2018-09-20 311 }
0345472c Song Qiang 2018-09-20 312 mutex_unlock(&data->lock);
0345472c Song Qiang 2018-09-20 313
0345472c Song Qiang 2018-09-20 314 iio_push_to_buffers_with_timestamp(indio_dev, buffer,
0345472c Song Qiang 2018-09-20 315 iio_get_time_ns(indio_dev));
0345472c Song Qiang 2018-09-20 316 done:
0345472c Song Qiang 2018-09-20 317 iio_trigger_notify_done(indio_dev->trig);
0345472c Song Qiang 2018-09-20 318
0345472c Song Qiang 2018-09-20 @319 return IRQ_HANDLED;
0345472c Song Qiang 2018-09-20 320 }
0345472c Song Qiang 2018-09-20 321

---
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https://lists.01.org/pipermail/kbuild-all Intel Corporation

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