Driver was checking for direct mode and trying to lock it, but
left a gap where mode could change before the desired operation.
Use iio_device_claim_direct_mode() to guarantee device stays in
direct mode.
Signed-off-by: Alison Schofield <amsfield22@xxxxxxxxx>
Cc: Daniel Baluta <daniel.baluta@xxxxxxxxx>
---
drivers/iio/adc/ad7793.c | 13 ++++---------
1 file changed, 4 insertions(+), 9 deletions(-)
diff --git a/drivers/iio/adc/ad7793.c b/drivers/iio/adc/ad7793.c
index 7b07bb6..3f41cd8 100644
--- a/drivers/iio/adc/ad7793.c
+++ b/drivers/iio/adc/ad7793.c
@@ -369,13 +369,6 @@ static ssize_t ad7793_write_frequency(struct device *dev,
long lval;
int i, ret;
- mutex_lock(&indio_dev->mlock);
- if (iio_buffer_enabled(indio_dev)) {
- mutex_unlock(&indio_dev->mlock);
- return -EBUSY;
- }
- mutex_unlock(&indio_dev->mlock);
-
ret = kstrtol(buf, 10, &lval);
if (ret)
return ret;
@@ -387,12 +380,14 @@ static ssize_t ad7793_write_frequency(struct device *dev,
for (i = 0; i < 16; i++)
if (lval == st->chip_info->sample_freq_avail[i]) {
- mutex_lock(&indio_dev->mlock);
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;
st->mode &= ~AD7793_MODE_RATE(-1);
st->mode |= AD7793_MODE_RATE(i);
ad_sd_write_reg(&st->sd, AD7793_REG_MODE,
sizeof(st->mode), st->mode);
- mutex_unlock(&indio_dev->mlock);
+ iio_device_release_direct_mode(indio_dev);
ret = 0;
}
--
2.1.4
--
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