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| author | Johannes Berg <johannes@sipsolutions.net> | 2007-02-16 01:38:29 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-02-23 14:52:09 -0800 |
| commit | 9c372d06ce9ddf65e1393f9ea22a6d6bd5f96b42 (patch) | |
| tree | 24e4b7d7ab60d68426c6c3e2ba976deffb94e575 /kernel/power | |
| parent | dfe461aef0d621d8472d0af343ae8a60866a7a8a (diff) | |
| download | linux-9c372d06ce9ddf65e1393f9ea22a6d6bd5f96b42.tar.gz | |
power management: no valid states w/o pm_ops
Change /sys/power/state to not advertise any valid states (except for disk if SOFTWARE_SUSPEND is enabled) when no pm_ops have been set so userspace can easily discover what states should be available. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Cc: "Randy.Dunlap" <rdunlap@xenotime.net> Cc: Rafael J. Wysocki <rjw@sisk.pl> Cc: Pavel Macheck <pavel@ucw.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'kernel/power')
| -rw-r--r-- | kernel/power/main.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/power/main.c b/kernel/power/main.c index e1c413120469..a064dfd8877a 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -167,7 +167,10 @@ static inline int valid_state(suspend_state_t state) if (state == PM_SUSPEND_DISK) return 1; - if (pm_ops && pm_ops->valid && !pm_ops->valid(state)) + /* all other states need lowlevel support and need to be + * valid to the lowlevel implementation, no valid callback + * implies that all are valid. */ + if (!pm_ops || (pm_ops->valid && !pm_ops->valid(state))) return 0; return 1; } |