From: Peter Meerwald <pmeerw@pmeerw.net>
Date: Wed, 1 Oct 2014 20:59:00 +0000 (+0100)
Subject: iio:magnetometer:mag3110: Report busy in _read_raw() / write_raw() when buffer is... 
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=f25330f63edd8e2d02ca76ed43fc852d4d76bb12;p=openwrt%2Fstaging%2Fblogic.git

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>
---

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);