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Groups > linux.kernel > #1446960

[PATCH] iio: accel: bma180: use iio helper function to guarantee direct mode

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Replace the code that guarantees the device stays in direct mode
with iio_device_claim_direct_mode() which does same.

Signed-off-by: Alison Schofield <amsfield22@gmail.com>
Cc: Daniel Baluta <daniel.baluta@gmail.com>
---
Peter: I was not clear if we want to keep the data->mutex lock
in addition to claiming direct mode.  I see that lock assuring
exclusivity amongst a few other tasks in the driver. Let me 
know if this needs both locks. Thanks!


 drivers/iio/accel/bma180.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/iio/accel/bma180.c b/drivers/iio/accel/bma180.c
index e3f88ba..ce5a476 100644
--- a/drivers/iio/accel/bma180.c
+++ b/drivers/iio/accel/bma180.c
@@ -469,13 +469,12 @@ static int bma180_read_raw(struct iio_dev *indio_dev,
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
-		mutex_lock(&data->mutex);
-		if (iio_buffer_enabled(indio_dev)) {
-			mutex_unlock(&data->mutex);
-			return -EBUSY;
-		}
+		ret = iio_device_claim_direct_mode(indio_dev);
+		if (ret)
+			return ret;
+
 		ret = bma180_get_data_reg(data, chan->scan_index);
-		mutex_unlock(&data->mutex);
+		iio_device_release_direct_mode(indio_dev);
 		if (ret < 0)
 			return ret;
 		*val = sign_extend32(ret >> chan->scan_type.shift,
-- 
2.1.4

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[PATCH] iio: accel: bma180: use iio helper function to guarantee  direct mode Alison Schofield <amsfield22@gmail.com> - 2016-07-20 06:30 +0200
  Re: [PATCH] iio: accel: bma180: use iio helper function to guarantee  direct mode Jonathan Cameron <jic23@kernel.org> - 2016-07-24 13:50 +0200

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