[patch 2.6.26-git] pm selftest: rtc paranoia

[David Brownell <david-b@pacbell.net>]

From: David Brownell <dbrownell@users.sourceforge.net>

Cope with a quirk of some RTCs (notably ACPI ones) which
aren't guaranteed to implement oneshot behavior when they
woke the system from sleeep:  forcibly disable the alarm,
just in case.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
---
 kernel/power/main.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/kernel/power/main.c	2008-07-22 16:38:32.000000000 -0700
+++ b/kernel/power/main.c	2008-07-22 16:39:15.000000000 -0700
@@ -635,6 +635,13 @@ static void __init test_wakealarm(struct
 	}
 	if (status < 0)
 		printk(err_suspend, status);
+
+	/* Some platforms can't detect that the alarm triggered the
+	 * wakeup, or (accordingly) disable it after it afterwards.
+	 * It's supposed to give oneshot behavior; cope.
+	 */
+	alm.enabled = false;
+	rtc_set_alarm(rtc, &alm);
 }
 
 static int __init has_wakealarm(struct device *dev, void *name_ptr)