From: Alison Schofield <amsfield22@gmail.com>
Date: Tue, 11 Oct 2016 19:31:36 +0000 (-0700)
Subject: iio: accel: mma8452: claim direct mode during raw reads
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=4d9b0413e29d61e6382b613f4835118504e65e86;p=linux-beck.git

iio: accel: mma8452: claim direct mode during raw reads

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 reads.

Signed-off-by: Alison Schofield <amsfield22@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
---

diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c
index 1c7051581513..7951def89d63 100644
--- a/drivers/iio/accel/mma8452.c
+++ b/drivers/iio/accel/mma8452.c
@@ -459,12 +459,14 @@ static int mma8452_read_raw(struct iio_dev *indio_dev,
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
-		if (iio_buffer_enabled(indio_dev))
-			return -EBUSY;
+		ret = iio_device_claim_direct_mode(indio_dev);
+		if (ret)
+			return ret;
 
 		mutex_lock(&data->lock);
 		ret = mma8452_read(data, buffer);
 		mutex_unlock(&data->lock);
+		iio_device_release_direct_mode(indio_dev);
 		if (ret < 0)
 			return ret;