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iio: imu: mpu6050: Balance runtime pm + use pm_runtime_resume_and_get()

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Remove an unblanced pm_runtime_put_sync_suspend() call
in inv_pu_pm_disable().  Not this call is not a bug, because the runtime
pm core will not allow the reference counter to go negative.  It is
however confusing and serves no purpose.

pm_runtime_resume_and_get() case found using coccicheck script under
review at:
https://lore.kernel.org/lkml/20210427141946.2478411-1-Julia.Lawall@inria.fr/

pm_runtime_resume_and_get() returns <= 0 only so simplify related checks
to bring this more inline with nearby calls.

This is a prequel to taking a closer look at the runtime pm in IIO drivers
in general.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Jean-Baptiste Maneyrol <jmaneyrol@invensense.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/20210516162103.1332291-2-jic23@kernel.org
This commit is contained in:
Jonathan Cameron 2021-05-16 17:20:58 +01:00
parent 12f13d1fae
commit 40b54cbebf
2 changed files with 8 additions and 17 deletions
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19
drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
View file

@ -570,11 +570,9 @@ static int inv_mpu6050_read_channel_data(struct iio_dev *indio_dev,
freq_hz = INV_MPU6050_DIVIDER_TO_FIFO_RATE(st->chip_config.divider);
period_us = 1000000 / freq_hz;
result = pm_runtime_get_sync(pdev);
if (result < 0) {
pm_runtime_put_noidle(pdev);
result = pm_runtime_resume_and_get(pdev);
if (result)
return result;
}
switch (chan->type) {
case IIO_ANGL_VEL:
@ -812,11 +810,9 @@ static int inv_mpu6050_write_raw(struct iio_dev *indio_dev,
return result;
mutex_lock(&st->lock);
result = pm_runtime_get_sync(pdev);
if (result < 0) {
pm_runtime_put_noidle(pdev);
result = pm_runtime_resume_and_get(pdev);
if (result)
goto error_write_raw_unlock;
}
switch (mask) {
case IIO_CHAN_INFO_SCALE:
@ -930,11 +926,9 @@ inv_mpu6050_fifo_rate_store(struct device *dev, struct device_attribute *attr,
result = 0;
goto fifo_rate_fail_unlock;
}
result = pm_runtime_get_sync(pdev);
if (result < 0) {
pm_runtime_put_noidle(pdev);
result = pm_runtime_resume_and_get(pdev);
if (result)
goto fifo_rate_fail_unlock;
}
result = regmap_write(st->map, st->reg->sample_rate_div, d);
if (result)
@ -1421,7 +1415,6 @@ static void inv_mpu_pm_disable(void *data)
{
struct device *dev = data;
pm_runtime_put_sync_suspend(dev);
pm_runtime_disable(dev);
}

6
drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c
View file

@ -173,11 +173,9 @@ static int inv_mpu6050_set_enable(struct iio_dev *indio_dev, bool enable)
if (enable) {
scan = inv_scan_query(indio_dev);
result = pm_runtime_get_sync(pdev);
if (result < 0) {
pm_runtime_put_noidle(pdev);
result = pm_runtime_resume_and_get(pdev);
if (result)
return result;
}
/*
* In case autosuspend didn't trigger, turn off first not
* required sensors.