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Subject[PATCH 4.9 23/87] iio: magnetometer: mag3110: claim direct mode during raw writes
Date
4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alison Schofield <amsfield22@gmail.com>


[ Upstream commit 80dea21f95a4672cce545f48dc2ca500b69a2584 ]

Driver was checking for direct mode but not locking it. Use
claim/release helper functions to guarantee the device stays
in direct mode during raw writes.

Signed-off-by: Alison Schofield <amsfield22@gmail.com>
Acked-by: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/iio/magnetometer/mag3110.c | 30 ++++++++++++++++++++----------
1 file changed, 20 insertions(+), 10 deletions(-)

--- a/drivers/iio/magnetometer/mag3110.c
+++ b/drivers/iio/magnetometer/mag3110.c
@@ -222,29 +222,39 @@ static int mag3110_write_raw(struct iio_
int val, int val2, long mask)
{
struct mag3110_data *data = iio_priv(indio_dev);
- int rate;
+ int rate, ret;

- if (iio_buffer_enabled(indio_dev))
- return -EBUSY;
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;

switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
rate = mag3110_get_samp_freq_index(data, val, val2);
- if (rate < 0)
- return -EINVAL;
+ if (rate < 0) {
+ ret = -EINVAL;
+ break;
+ }

data->ctrl_reg1 &= ~MAG3110_CTRL_DR_MASK;
data->ctrl_reg1 |= rate << MAG3110_CTRL_DR_SHIFT;
- return i2c_smbus_write_byte_data(data->client,
+ ret = i2c_smbus_write_byte_data(data->client,
MAG3110_CTRL_REG1, data->ctrl_reg1);
+ break;
case IIO_CHAN_INFO_CALIBBIAS:
- if (val < -10000 || val > 10000)
- return -EINVAL;
- return i2c_smbus_write_word_swapped(data->client,
+ if (val < -10000 || val > 10000) {
+ ret = -EINVAL;
+ break;
+ }
+ ret = i2c_smbus_write_word_swapped(data->client,
MAG3110_OFF_X + 2 * chan->scan_index, val << 1);
+ break;
default:
- return -EINVAL;
+ ret = -EINVAL;
+ break;
}
+ iio_device_release_direct_mode(indio_dev);
+ return ret;
}

static irqreturn_t mag3110_trigger_handler(int irq, void *p)

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