There are currently two possible cases for data transmission with the sensor: read/write by iio sysfs and read in trigger interrupt handler. Hence we need to protect data transmission using regmap_* functions with mutex. Signed-off-by: Marcin Niestroj <m.niestroj@xxxxxxxxxxxxxxxx> --- Patch introduced in v2 drivers/iio/imu/bmi160/bmi160_core.c | 39 +++++++++++++++++++++++++++++------- 1 file changed, 32 insertions(+), 7 deletions(-) diff --git a/drivers/iio/imu/bmi160/bmi160_core.c b/drivers/iio/imu/bmi160/bmi160_core.c index e0251b8..095533c 100644 --- a/drivers/iio/imu/bmi160/bmi160_core.c +++ b/drivers/iio/imu/bmi160/bmi160_core.c @@ -2,6 +2,7 @@ * BMI160 - Bosch IMU (accel, gyro plus external magnetometer) * * Copyright (c) 2016, Intel Corporation. + * Copyright (c) 2016, Grinn * * This file is subject to the terms and conditions of version 2 of * the GNU General Public License. See the file COPYING in the main @@ -112,6 +113,7 @@ enum bmi160_sensor_type { struct bmi160_data { struct regmap *regmap; + struct mutex mutex; }; const struct regmap_config bmi160_regmap_config = { @@ -285,7 +287,9 @@ int bmi160_set_mode(struct bmi160_data *data, enum bmi160_sensor_type t, else cmd = bmi160_regs[t].pmu_cmd_suspend; + mutex_lock(&data->mutex); ret = regmap_write(data->regmap, BMI160_REG_CMD, cmd); + mutex_unlock(&data->mutex); if (ret < 0) return ret; @@ -298,6 +302,7 @@ static int bmi160_set_scale(struct bmi160_data *data, enum bmi160_sensor_type t, int uscale) { + int ret; int i; for (i = 0; i < bmi160_scale_table[t].num; i++) @@ -307,8 +312,12 @@ int bmi160_set_scale(struct bmi160_data *data, enum bmi160_sensor_type t, if (i == bmi160_scale_table[t].num) return -EINVAL; - return regmap_write(data->regmap, bmi160_regs[t].range, - bmi160_scale_table[t].tbl[i].bits); + mutex_lock(&data->mutex); + ret = regmap_write(data->regmap, bmi160_regs[t].range, + bmi160_scale_table[t].tbl[i].bits); + mutex_unlock(&data->mutex); + + return ret; } static @@ -317,7 +326,9 @@ int bmi160_get_scale(struct bmi160_data *data, enum bmi160_sensor_type t, { int i, ret, val; + mutex_lock(&data->mutex); ret = regmap_read(data->regmap, bmi160_regs[t].range, &val); + mutex_unlock(&data->mutex); if (ret < 0) return ret; @@ -340,7 +351,9 @@ static int bmi160_get_data(struct bmi160_data *data, int chan_type, reg = bmi160_regs[t].data + (axis - IIO_MOD_X) * sizeof(__le16); + mutex_lock(&data->mutex); ret = regmap_bulk_read(data->regmap, reg, &sample, sizeof(__le16)); + mutex_unlock(&data->mutex); if (ret < 0) return ret; @@ -353,6 +366,7 @@ static int bmi160_set_odr(struct bmi160_data *data, enum bmi160_sensor_type t, int odr, int uodr) { + int ret; int i; for (i = 0; i < bmi160_odr_table[t].num; i++) @@ -363,10 +377,14 @@ int bmi160_set_odr(struct bmi160_data *data, enum bmi160_sensor_type t, if (i >= bmi160_odr_table[t].num) return -EINVAL; - return regmap_update_bits(data->regmap, - bmi160_regs[t].config, - bmi160_regs[t].config_odr_mask, - bmi160_odr_table[t].tbl[i].bits); + mutex_lock(&data->mutex); + ret = regmap_update_bits(data->regmap, + bmi160_regs[t].config, + bmi160_regs[t].config_odr_mask, + bmi160_odr_table[t].tbl[i].bits); + mutex_unlock(&data->mutex); + + return ret; } static int bmi160_get_odr(struct bmi160_data *data, enum bmi160_sensor_type t, @@ -374,7 +392,9 @@ static int bmi160_get_odr(struct bmi160_data *data, enum bmi160_sensor_type t, { int i, val, ret; + mutex_lock(&data->mutex); ret = regmap_read(data->regmap, bmi160_regs[t].config, &val); + mutex_unlock(&data->mutex); if (ret < 0) return ret; @@ -402,14 +422,18 @@ static irqreturn_t bmi160_trigger_handler(int irq, void *p) int i, ret, j = 0, base = BMI160_REG_DATA_MAGN_XOUT_L; __le16 sample; + mutex_lock(&data->mutex); for_each_set_bit(i, indio_dev->active_scan_mask, indio_dev->masklength) { ret = regmap_bulk_read(data->regmap, base + i * sizeof(__le16), &sample, sizeof(__le16)); - if (ret < 0) + if (ret < 0) { + mutex_unlock(&data->mutex); goto done; + } buf[j++] = sample; } + mutex_unlock(&data->mutex); iio_push_to_buffers_with_timestamp(indio_dev, buf, iio_get_time_ns(indio_dev)); @@ -575,6 +599,7 @@ int bmi160_core_probe(struct device *dev, struct regmap *regmap, data = iio_priv(indio_dev); dev_set_drvdata(dev, indio_dev); data->regmap = regmap; + mutex_init(&data->mutex); ret = bmi160_chip_init(data, use_spi); if (ret < 0) -- 2.10.2 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html