[PATCH] introduce .valid callback for pm_ops
Add pm_ops.valid callback, so only the available pm states show in
/sys/power/state. And this also makes an earlier states error report at
enter_state before we do actual suspend/resume.
Signed-off-by: Shaohua Li<shaohua.li@intel.com>
Acked-by: Pavel Machek<pavel@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 22bdc93..18d7d69 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -167,6 +167,8 @@
{
int error;
+ if (pm_ops->valid && !pm_ops->valid(state))
+ return -ENODEV;
if (down_trylock(&pm_sem))
return -EBUSY;
@@ -236,7 +238,8 @@
char * s = buf;
for (i = 0; i < PM_SUSPEND_MAX; i++) {
- if (pm_states[i])
+ if (pm_states[i] && pm_ops && (!pm_ops->valid
+ ||(pm_ops->valid && pm_ops->valid(i))))
s += sprintf(s,"%s ",pm_states[i]);
}
s += sprintf(s,"\n");