[PATCH 4.0 028/148] iio:st_sensors: Fix oops when probing SPI devices

Greg Kroah-Hartman
2015-06-03T12:18:16Z

From: Alban Bedel <alban.bedel@avionic-design.de>

commit 8e71c04f863a1754f21b27fb8ecb773d680a0a80 upstream.

In SPI mode the transfer buffer is locked with a mutex. However this
mutex is only initilized after the probe, but some transfer needs to
be done in the probe.

To fix this bug we move the mutex initialization at the beginning of
the device probe.

Signed-off-by: Alban Bedel <alban.bedel@avionic-design.de>
Acked-by: Denis Ciocca <denis.ciocca@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/iio/accel/st_accel_core.c | 1 +
drivers/iio/common/st_sensors/st_sensors_core.c | 2 --
drivers/iio/gyro/st_gyro_core.c | 1 +
drivers/iio/magnetometer/st_magn_core.c | 1 +
drivers/iio/pressure/st_pressure_core.c | 1 +
5 files changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/iio/accel/st_accel_core.c
+++ b/drivers/iio/accel/st_accel_core.c
@@ -465,6 +465,7 @@ int st_accel_common_probe(struct iio_dev

indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &accel_info;
+ mutex_init(&adata->tb.buf_lock);

st_sensors_power_enable(indio_dev);

--- a/drivers/iio/common/st_sensors/st_sensors_core.c
+++ b/drivers/iio/common/st_sensors/st_sensors_core.c
@@ -304,8 +304,6 @@ int st_sensors_init_sensor(struct iio_de
struct st_sensors_platform_data *of_pdata;
int err = 0;

- mutex_init(&sdata->tb.buf_lock);
-
/* If OF/DT pdata exists, it will take precedence of anything else */
of_pdata = st_sensors_of_probe(indio_dev->dev.parent, pdata);
if (of_pdata)
--- a/drivers/iio/gyro/st_gyro_core.c
+++ b/drivers/iio/gyro/st_gyro_core.c
@@ -317,6 +317,7 @@ int st_gyro_common_probe(struct iio_dev

indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &gyro_info;
+ mutex_init(&gdata->tb.buf_lock);

st_sensors_power_enable(indio_dev);

--- a/drivers/iio/magnetometer/st_magn_core.c
+++ b/drivers/iio/magnetometer/st_magn_core.c
@@ -369,6 +369,7 @@ int st_magn_common_probe(struct iio_dev

indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &magn_info;
+ mutex_init(&mdata->tb.buf_lock);

st_sensors_power_enable(indio_dev);

--- a/drivers/iio/pressure/st_pressure_core.c
+++ b/drivers/iio/pressure/st_pressure_core.c
@@ -417,6 +417,7 @@ int st_press_common_probe(struct iio_dev

indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &press_info;
+ mutex_init(&press_data->tb.buf_lock);

st_sensors_power_enable(indio_dev);