lisa/android_kernel_xiaomi_sm8350
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

PM / runtime: Document steps for device removal

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

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Krzysztof Kozlowski 2016-04-03 12:23:07 +09:00 committed by Rafael J. Wysocki
parent 9735a22799
commit 8fd2910e31
1 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/power/runtime_pm.txt
View File

@ -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 but also it allows of more flexibility in the handling of devices during the
removal of their drivers. 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 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 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, attribute to "on", which causes pm_runtime_forbid() to be called. In principle,