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[PATCH] introduce .valid callback for pm_ops

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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<[email protected]>
Acked-by: Pavel Machek<[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Shaohua Li 2005-10-30 15:00:01 -08:00 • committed by Linus Torvalds
commit eb9289eb20
3 changed files with 13 additions and 1 deletions
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5
kernel/power/main.c
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@ -167,6 +167,8 @@ static int enter_state(suspend_state_t state)
{
int error;
if (pm_ops->valid && !pm_ops->valid(state))
return -ENODEV;
if (down_trylock(&pm_sem))
return -EBUSY;
@ -236,7 +238,8 @@ static ssize_t state_show(struct subsystem * subsys, char * buf)
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");