[PATCH v2 2/2] iio: gyro: mpu3050-core: use pm_runtime_resume_and_get()

[Antoniu Miclaus]

Replace pm_runtime_get_sync() with pm_runtime_resume_and_get() in
mpu3050_read_raw() and mpu3050_buffer_preenable(). Unlike
pm_runtime_get_sync(), the usage count is not incremented on error.

In preenable, call pm_runtime_put_autosuspend() if set_8khz_samplerate()
fails since postdisable won't be called on preenable failure.

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@xxxxxxxxxx>
---
 drivers/iio/gyro/mpu3050-core.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/gyro/mpu3050-core.c b/drivers/iio/gyro/mpu3050-core.c
index ee2fcd20545d..1cc421eb4782 100644
--- a/drivers/iio/gyro/mpu3050-core.c
+++ b/drivers/iio/gyro/mpu3050-core.c
@@ -322,7 +322,9 @@ static int mpu3050_read_raw(struct iio_dev *indio_dev,
 		}
 	case IIO_CHAN_INFO_RAW:
 		/* Resume device */
-		pm_runtime_get_sync(mpu3050->dev);
+		ret = pm_runtime_resume_and_get(mpu3050->dev);
+		if (ret)
+			return ret;
 		mutex_lock(&mpu3050->lock);
 
 		ret = mpu3050_set_8khz_samplerate(mpu3050);
@@ -647,12 +649,19 @@ static irqreturn_t mpu3050_trigger_handler(int irq, void *p)
 static int mpu3050_buffer_preenable(struct iio_dev *indio_dev)
 {
 	struct mpu3050 *mpu3050 = iio_priv(indio_dev);
+	int ret;
 
-	pm_runtime_get_sync(mpu3050->dev);
+	ret = pm_runtime_resume_and_get(mpu3050->dev);
+	if (ret)
+		return ret;
 
 	/* Unless we have OUR trigger active, run at full speed */
-	if (!mpu3050->hw_irq_trigger)
-		return mpu3050_set_8khz_samplerate(mpu3050);
+	if (!mpu3050->hw_irq_trigger) {
+		ret = mpu3050_set_8khz_samplerate(mpu3050);
+		if (ret)
+			pm_runtime_put_autosuspend(mpu3050->dev);
+		return ret;
+	}
 
 	return 0;
 }
-- 
2.43.0