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authorJohannes Berg <johannes@sipsolutions.net>2007-04-30 15:09:55 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-04-30 16:40:40 -0700
commit9684e51cd157607f0727c1550e7df6e31de40808 (patch)
treeeef6e19205a22817ee659cb2dc7b9ae39465c69d /include/linux/pm.h
parente8c9c502690efd24b7055bf608e7a3c34216848b (diff)
power management: force pm_ops.valid callback to be assigned
This patch changes the docs and behaviour from "all states valid" to "no states valid" if no .valid callback is assigned. Users of pm_ops that only need mem sleep can assign pm_valid_only_mem without any overhead, others will require more elaborate callbacks. Now that all users of pm_ops have a .valid callback this is a safe thing to do and prevents things from getting messy again as they were before. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Acked-by: Pavel Machek <pavel@ucw.cz> Looks-okay-to: Rafael J. Wysocki <rjw@sisk.pl> Cc: <linux-pm@lists.linux-foundation.org> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/pm.h')
-rw-r--r--include/linux/pm.h12
1 files changed, 6 insertions, 6 deletions
diff --git a/include/linux/pm.h b/include/linux/pm.h
index 6035209cf31..7a516690dcb 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -125,12 +125,12 @@ typedef int __bitwise suspend_disk_method_t;
* struct pm_ops - Callbacks for managing platform dependent suspend states.
* @valid: Callback to determine whether the given state can be entered.
* If %CONFIG_SOFTWARE_SUSPEND is set then %PM_SUSPEND_DISK is
- * always valid and never passed to this call.
- * If not assigned, all suspend states are advertised as valid
- * in /sys/power/state (but can still be rejected by prepare or enter.)
- * Since new states can be added for other platforms, you should
- * assign this callback. There is a %pm_valid_only_mem function
- * available if you only implemented mem sleep.
+ * always valid and never passed to this call. If not assigned,
+ * no suspend states are valid.
+ * Valid states are advertised in /sys/power/state but can still
+ * be rejected by prepare or enter if the conditions aren't right.
+ * There is a %pm_valid_only_mem function available that can be assigned
+ * to this if you only implement mem sleep.
*
* @prepare: Prepare the platform for the given suspend state. Can return a
* negative error code if necessary.