[patch added to the 3.12 stable tree] iio: hid_sensor_hub: Fix indio_dev->trig assignment

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From: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>

This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.

===============

commit 55a6f9ddfdea0d2d343cd1b39baf8aa752664b6e upstream.

This can result in wrong reference count for trigger device, call
iio_trigger_get to increment reference.
Refer to http://www.spinics.net/lists/linux-iio/msg13669.html for discussion
with Jonathan.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
 drivers/iio/common/hid-sensors/hid-sensor-trigger.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/common/hid-sensors/hid-sensor-trigger.c b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
index a422f597d6b4..4129b6b7ca0b 100644
--- a/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
+++ b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
@@ -83,7 +83,8 @@ int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
 		dev_err(&indio_dev->dev, "Trigger Register Failed\n");
 		goto error_free_trig;
 	}
-	indio_dev->trig = attrb->trigger = trig;
+	attrb->trigger = trig;
+	indio_dev->trig = iio_trigger_get(trig);
 
 	return ret;
 
-- 
2.1.1

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