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| author | Krzysztof Kozlowski <krzk@kernel.org> | 2016-04-03 12:23:07 +0900 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-04-05 03:46:59 +0200 |
| commit | 8fd2910e31155d8562180cc8580bc27e3be4f4bf (patch) | |
| tree | f7315ae6cc2f4d888eb4dc1e20deb44d74b1b207 | |
| parent | 9735a22799b9214d17d3c231fe377fc852f042e9 (diff) | |
| download | lwn-8fd2910e31155d8562180cc8580bc27e3be4f4bf.tar.gz lwn-8fd2910e31155d8562180cc8580bc27e3be4f4bf.zip | |
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: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | Documentation/power/runtime_pm.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/power/runtime_pm.txt b/Documentation/power/runtime_pm.txt index 7328cf85236c..1fd1fbe9ce95 100644 --- a/Documentation/power/runtime_pm.txt +++ b/Documentation/power/runtime_pm.txt @@ -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, |