linux-kernel - [PATCH 4.4 34/37] iio: itg3200: Call iio_trigger_notify

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Message-Id: <20211213092926.500225019@linuxfoundation.org>
Date:   Mon, 13 Dec 2021 10:30:12 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>,
        Stable@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH 4.4 34/37] iio: itg3200: Call iio_trigger_notify_done() on error

From: Lars-Peter Clausen <lars@...afoo.de>

commit 67fe29583e72b2103abb661bb58036e3c1f00277 upstream.

IIO trigger handlers must call iio_trigger_notify_done() when done. This
must be done even when an error occurred. Otherwise the trigger will be
seen as busy indefinitely and the trigger handler will never be called
again.

The itg3200 driver neglects to call iio_trigger_notify_done() when there is
an error reading the gyro data. Fix this by making sure that
iio_trigger_notify_done() is included in the error exit path.

Fixes: 9dbf091da080 ("iio: gyro: Add itg3200")
Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
Link: https://lore.kernel.org/r/20211101144055.13858-1-lars@metafoo.de
Cc: <Stable@...r.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/iio/gyro/itg3200_buffer.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/iio/gyro/itg3200_buffer.c
+++ b/drivers/iio/gyro/itg3200_buffer.c
@@ -64,9 +64,9 @@ static irqreturn_t itg3200_trigger_handl
 
 	iio_push_to_buffers_with_timestamp(indio_dev, &scan, pf->timestamp);
 
+error_ret:
 	iio_trigger_notify_done(indio_dev->trig);
 
-error_ret:
 	return IRQ_HANDLED;
 }