[PATCH v2 2/4] iio: gyro: mpu3050: Fix irq resource leak

[Ethan Tidmore]

The interrupt handler is setup but only a few lines down if
iio_trigger_register() fails the function returns without properly
releasing the handler:

        ret = request_threaded_irq(irq,
                                   mpu3050_irq_handler,
                                   mpu3050_irq_thread,
                                   irq_trig,
                                   mpu3050->trig->name,
                                   mpu3050->trig);

...

        ret = iio_trigger_register(mpu3050->trig);
        if (ret)
                return ret;

        indio_dev->trig = iio_trigger_get(mpu3050->trig);

        return 0;
}

Add cleanup goto to resolve resource leak.

Detected by Smatch:
drivers/iio/gyro/mpu3050-core.c:1128 mpu3050_trigger_probe() warn:
'irq' from request_threaded_irq() not released on lines: 1124.

Fixes: 3904b28efb2c7 ("iio: gyro: Add driver for the MPU-3050 gyroscope")
Signed-off-by: Ethan Tidmore <ethantidmore06@xxxxxxxxx>
---
 drivers/iio/gyro/mpu3050-core.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/gyro/mpu3050-core.c b/drivers/iio/gyro/mpu3050-core.c
index 06162d886b59..b6e05afbe512 100644
--- a/drivers/iio/gyro/mpu3050-core.c
+++ b/drivers/iio/gyro/mpu3050-core.c
@@ -1121,11 +1121,16 @@ static int mpu3050_trigger_probe(struct iio_dev *indio_dev, int irq)
 
 	ret = iio_trigger_register(mpu3050->trig);
 	if (ret)
-		return ret;
+		goto err_iio_trigger;
 
 	indio_dev->trig = iio_trigger_get(mpu3050->trig);
 
 	return 0;
+
+err_iio_trigger:
+	free_irq(mpu3050->irq, mpu3050->trig);
+
+	return ret;
 }
 
 int mpu3050_common_probe(struct device *dev,
-- 
2.53.0