From 66e748ae7f82301af3b2c2bd0b3bd46d01fd7471 Mon Sep 17 00:00:00 2001 From: Jonathan Cameron Date: Sun, 9 May 2021 12:33:50 +0100 Subject: [PATCH] iio: temp: mlx90614: Handle failure in pm_runtime_resume_and_get() Converts from using pm_runtime_get_sync() with no error handling over to pm_runtime_resume_and_get() which will ensure we don't end up holding a reference. Ensure this error return is then handled at calls to mlx90614_power_get(). These are all direct returns. Signed-off-by: Jonathan Cameron Reviewed-by: Mauro Carvalho Chehab Link: https://lore.kernel.org/r/20210509113354.660190-25-jic23@kernel.org --- drivers/iio/temperature/mlx90614.c | 25 ++++++++++++++++++++----- 1 file changed, 20 insertions(+), 5 deletions(-) diff --git a/drivers/iio/temperature/mlx90614.c b/drivers/iio/temperature/mlx90614.c index ef0fec94d269..afcb10ea7c44 100644 --- a/drivers/iio/temperature/mlx90614.c +++ b/drivers/iio/temperature/mlx90614.c @@ -176,11 +176,14 @@ static inline s32 mlx90614_iir_search(const struct i2c_client *client, static int mlx90614_power_get(struct mlx90614_data *data, bool startup) { unsigned long now; + int ret; if (!data->wakeup_gpio) return 0; - pm_runtime_get_sync(&data->client->dev); + ret = pm_runtime_resume_and_get(&data->client->dev); + if (ret < 0) + return ret; if (startup) { now = jiffies; @@ -267,7 +270,10 @@ static int mlx90614_read_raw(struct iio_dev *indio_dev, *val = MLX90614_CONST_SCALE; return IIO_VAL_INT; case IIO_CHAN_INFO_CALIBEMISSIVITY: /* 1/65535 / LSB */ - mlx90614_power_get(data, false); + ret = mlx90614_power_get(data, false); + if (ret < 0) + return ret; + mutex_lock(&data->lock); ret = i2c_smbus_read_word_data(data->client, MLX90614_EMISSIVITY); @@ -287,7 +293,10 @@ static int mlx90614_read_raw(struct iio_dev *indio_dev, return IIO_VAL_INT_PLUS_NANO; case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: /* IIR setting with FIR = 1024 */ - mlx90614_power_get(data, false); + ret = mlx90614_power_get(data, false); + if (ret < 0) + return ret; + mutex_lock(&data->lock); ret = i2c_smbus_read_word_data(data->client, MLX90614_CONFIG); mutex_unlock(&data->lock); @@ -319,7 +328,10 @@ static int mlx90614_write_raw(struct iio_dev *indio_dev, val = val * MLX90614_CONST_RAW_EMISSIVITY_MAX + val2 / MLX90614_CONST_EMISSIVITY_RESOLUTION; - mlx90614_power_get(data, false); + ret = mlx90614_power_get(data, false); + if (ret < 0) + return ret; + mutex_lock(&data->lock); ret = mlx90614_write_word(data->client, MLX90614_EMISSIVITY, val); @@ -331,7 +343,10 @@ static int mlx90614_write_raw(struct iio_dev *indio_dev, if (val < 0 || val2 < 0) return -EINVAL; - mlx90614_power_get(data, false); + ret = mlx90614_power_get(data, false); + if (ret < 0) + return ret; + mutex_lock(&data->lock); ret = mlx90614_iir_search(data->client, val * 100 + val2 / 10000);