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power management: implement pm_ops.valid for everybody

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Almost all users of pm_ops only support mem sleep, don't check in .valid and
don't reject any others in .prepare so users can be confused if they check
/sys/power/state, especially when new states are added (these would then
result in s-t-r although they're supposed to be something different).

This patch implements a generic pm_valid_only_mem function that is then
exported for users and puts it to use in almost all existing pm_ops.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Cc: David Brownell <david-b@pacbell.net>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: linux-pm@lists.linux-foundation.org
Cc: Len Brown <lenb@kernel.org>
Acked-by: Russell King <rmk@arm.linux.org.uk>
Cc: Greg KH <greg@kroah.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Berg 2007-04-30 15:09:54 -07:00 • committed by Linus Torvalds
parent 11d77d0c01
commit e8c9c50269
11 changed files with 39 additions and 55 deletions
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13
kernel/power/main.c
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@ -48,6 +48,19 @@ void pm_set_ops(struct pm_ops * ops)
mutex_unlock(&pm_mutex);
}
/**
* pm_valid_only_mem - generic memory-only valid callback
*
* pm_ops drivers that implement mem suspend only and only need
* to check for that in their .valid callback can use this instead
* of rolling their own .valid callback.
*/
int pm_valid_only_mem(suspend_state_t state)
{
return state == PM_SUSPEND_MEM;
}
static inline void pm_finish(suspend_state_t state)
{
if (pm_ops->finish)