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0b5e142ced
mpl115_probe() enables runtime PM when a shutdown GPIO is present and
then returns the result of devm_iio_device_register(). If registration
fails, runtime PM remains enabled and autosuspend remains selected.
The same unmanaged runtime PM state is also left behind on driver
unbind, as the IIO device registration is managed but the runtime PM
setup is not.
Use devm_pm_runtime_enable() so runtime PM is disabled automatically on
probe failure and driver unbind, and check pm_runtime_set_active() so
setup errors are reported.
Set the autosuspend parameters before enabling runtime PM. Once probe
has completed, the driver core queues an idle request for the device, so
an explicit pm_runtime_get_noresume()/pm_runtime_put() pair is not
needed to start autosuspend.
Fixes: 0c3a333524 ("iio: pressure: mpl115: Implementing low power mode by shutdown gpio")
Cc: stable@vger.kernel.org
Suggested-by: jonathan.cameron@oss.qualcomm.com
Signed-off-by: Can Peng <pengcan@kylinos.cn>
Signed-off-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>
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