iio:magnetometer:mag3110: Report busy in _read_raw() / write_raw() when buffer is enabled

individual reads are not permitted concurrently with buffered reads

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/iio/magnetometer/mag3110.c b/drivers/iio/magnetometer/mag3110.c
index 4b65b6d3bdb1..b88cb44f87ce 100644
--- a/drivers/iio/magnetometer/mag3110.c
+++ b/drivers/iio/magnetometer/mag3110.c
@@ -154,6 +154,9 @@ static int mag3110_read_raw(struct iio_dev *indio_dev,
 
         switch (mask) {
         case IIO_CHAN_INFO_RAW:
+                if (iio_buffer_enabled(indio_dev))
+                        return -EBUSY;
+
                 switch (chan->type) {
                 case IIO_MAGN: /* in 0.1 uT / LSB */
                         ret = mag3110_read(data, buffer);
@@ -199,6 +202,9 @@ static int mag3110_write_raw(struct iio_dev *indio_dev,
         struct mag3110_data *data = iio_priv(indio_dev);
         int rate;
 
+        if (iio_buffer_enabled(indio_dev))
+                return -EBUSY;
+
         switch (mask) {
         case IIO_CHAN_INFO_SAMP_FREQ:
                 rate = mag3110_get_samp_freq_index(data, val, val2);