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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>
This commit is contained in:
Johannes Berg 2007-02-16 01:38:29 -08:00 committed by Greg Kroah-Hartman
parent dfe461aef0
commit 9c372d06ce
1 changed files with 4 additions and 1 deletions
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5
kernel/power/main.c
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@ -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;
}