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| author | Shaohua Li <shaohua.li@intel.com> | 2005-10-30 15:00:01 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-10-30 17:37:15 -0800 |
| commit | eb9289eb20df6b54214c45ac7c6bf5179a149026 (patch) | |
| tree | dac51cecdd94e0c7273c990259ddd800057311b9 /kernel/power | |
| parent | 0245b3e787dc3267a915e1f56419e7e9c197e148 (diff) | |
| download | lwn-eb9289eb20df6b54214c45ac7c6bf5179a149026.tar.gz lwn-eb9289eb20df6b54214c45ac7c6bf5179a149026.zip | |
[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>
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 22bdc93cc038..18d7d693fbba 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -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"); |