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Commit 8fd2910e authored by Krzysztof Kozlowski's avatar Krzysztof Kozlowski Committed by Rafael J. Wysocki
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PM / runtime: Document steps for device removal 



Put a reminder that during device removal drivers should revert all PM
runtime changes from the probe.

Signed-off-by: default avatarKrzysztof Kozlowski <krzk@kernel.org>
Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 9735a227

Documentation/power/runtime_pm.txt

+4 −0
Original line number Diff line number Diff line
@@ -586,6 +586,10 @@ drivers to make their ->remove() callbacks avoid races with runtime PM directly, 
but also it allows of more flexibility in the handling of devices during the

removal of their drivers.



Drivers in ->remove() callback should undo the runtime PM changes done

in ->probe(). Usually this means calling pm_runtime_disable(),

pm_runtime_dont_use_autosuspend() etc.



The user space can effectively disallow the driver of the device to power manage

it at run time by changing the value of its /sys/devices/.../power/control

attribute to "on", which causes pm_runtime_forbid() to be called.  In principle,