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authorJohannes Berg <johannes@sipsolutions.net>2007-02-16 01:38:29 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2007-02-23 14:52:09 -0800
commit9c372d06ce9ddf65e1393f9ea22a6d6bd5f96b42 (patch)
tree24e4b7d7ab60d68426c6c3e2ba976deffb94e575 /kernel/power
parentdfe461aef0d621d8472d0af343ae8a60866a7a8a (diff)
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.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/power/main.c b/kernel/power/main.c
index e1c41312046..a064dfd8877 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;
}