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| author | David Brownell <david-b@pacbell.net> | 2005-05-12 21:06:27 +0200 |
|---|---|---|
| committer | Greg KH <gregkh@suse.de> | 2005-05-17 23:54:55 +0200 |
| commit | 0b405a0f7e4d4d18fd1fe46ddf5ff465443036ab (patch) | |
| tree | 49d74df6eddfdd095c650e0af34cde7f4548a2d5 /Documentation/power/devices.txt | |
| parent | [PATCH] Driver Core: pm diagnostics update, check for errors (diff) | |
| download | linux-0b405a0f7e4d4d18fd1fe46ddf5ff465443036ab.tar.xz linux-0b405a0f7e4d4d18fd1fe46ddf5ff465443036ab.zip | |
[PATCH] Driver Core: remove driver model detach_state
The driver model has a "detach_state" mechanism that:
- Has never been used by any in-kernel drive;
- Is superfluous, since driver remove() methods can do the same thing;
- Became buggy when the suspend() parameter changed semantics and type;
- Could self-deadlock when called from certain suspend contexts;
- Is effectively wasted documentation, object code, and headspace.
This removes that "detach_state" mechanism; net code shrink, as well
as a per-device saving in the driver model and sysfs.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'Documentation/power/devices.txt')
| -rw-r--r-- | Documentation/power/devices.txt | 21 |
1 files changed, 0 insertions, 21 deletions
diff --git a/Documentation/power/devices.txt b/Documentation/power/devices.txt index 5d4ae9a39f1d..f987afe43e28 100644 --- a/Documentation/power/devices.txt +++ b/Documentation/power/devices.txt @@ -207,27 +207,6 @@ SYSTEM_SHUTDOWN, I do not understand this one too much. probably event #READY_AFTER_RESUME # -Driver Detach Power Management - -The kernel now supports the ability to place a device in a low-power -state when it is detached from its driver, which happens when its -module is removed. - -Each device contains a 'detach_state' file in its sysfs directory -which can be used to control this state. Reading from this file -displays what the current detach state is set to. This is 0 (On) by -default. A user may write a positive integer value to this file in the -range of 1-4 inclusive. - -A value of 1-3 will indicate the device should be placed in that -low-power state, which will cause ->suspend() to be called for that -device. A value of 4 indicates that the device should be shutdown, so -->shutdown() will be called for that device. - -The driver is responsible for reinitializing the device when the -module is re-inserted during it's ->probe() (or equivalent) method. -The driver core will not call any extra functions when binding the -device to the driver. pm_message_t meaning |