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| author | Johannes Berg <johannes@sipsolutions.net> | 2007-04-30 15:09:55 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-04-30 16:40:40 -0700 |
| commit | 9684e51cd157607f0727c1550e7df6e31de40808 (patch) | |
| tree | eef6e19205a22817ee659cb2dc7b9ae39465c69d /include/linux | |
| parent | e8c9c502690efd24b7055bf608e7a3c34216848b (diff) | |
| download | linux-3.10-9684e51cd157607f0727c1550e7df6e31de40808.tar.gz linux-3.10-9684e51cd157607f0727c1550e7df6e31de40808.tar.bz2 linux-3.10-9684e51cd157607f0727c1550e7df6e31de40808.zip | |
power management: force pm_ops.valid callback to be assigned
This patch changes the docs and behaviour from "all states valid" to "no
states valid" if no .valid callback is assigned. Users of pm_ops that only
need mem sleep can assign pm_valid_only_mem without any overhead, others
will require more elaborate callbacks.
Now that all users of pm_ops have a .valid callback this is a safe thing to
do and prevents things from getting messy again as they were before.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Pavel Machek <pavel@ucw.cz>
Looks-okay-to: Rafael J. Wysocki <rjw@sisk.pl>
Cc: <linux-pm@lists.linux-foundation.org>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/pm.h | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/include/linux/pm.h b/include/linux/pm.h index 6035209cf31..7a516690dcb 100644 --- a/include/linux/pm.h +++ b/include/linux/pm.h @@ -125,12 +125,12 @@ typedef int __bitwise suspend_disk_method_t; * struct pm_ops - Callbacks for managing platform dependent suspend states. * @valid: Callback to determine whether the given state can be entered. * If %CONFIG_SOFTWARE_SUSPEND is set then %PM_SUSPEND_DISK is - * always valid and never passed to this call. - * If not assigned, all suspend states are advertised as valid - * in /sys/power/state (but can still be rejected by prepare or enter.) - * Since new states can be added for other platforms, you should - * assign this callback. There is a %pm_valid_only_mem function - * available if you only implemented mem sleep. + * always valid and never passed to this call. If not assigned, + * no suspend states are valid. + * Valid states are advertised in /sys/power/state but can still + * be rejected by prepare or enter if the conditions aren't right. + * There is a %pm_valid_only_mem function available that can be assigned + * to this if you only implement mem sleep. * * @prepare: Prepare the platform for the given suspend state. Can return a * negative error code if necessary. |