[Suspend2][ 08/16] [Suspend2] Can suspend?

[Nigel Cunningham <nigel@suspend2.net>]

Test whether resume2= points to a recognised signature. That is, can we
even try to suspend?

Signed-off-by: Nigel Cunningham <nigel@suspend2.net>

 kernel/power/suspend.c |   24 ++++++++++++++++++++++++
 1 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 504eed7..bda4c2a 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -575,3 +575,27 @@ void suspend_cleanup(void)
 	up(&pm_sem);
 }
 
+static int can_suspend(void)
+{
+	if (down_trylock(&pm_sem)) {
+		set_result_state(SUSPEND_ABORTED);
+		set_result_state(SUSPEND_PM_SEM);
+		return 0;
+	}
+
+	if (!test_suspend_state(SUSPEND_CAN_SUSPEND))
+		suspend_attempt_to_parse_resume_device();
+
+	if (!test_suspend_state(SUSPEND_CAN_SUSPEND)) {
+		printk(name_suspend "Software suspend is disabled.\n"
+			"This may be because you haven't put something along "
+			"the lines of\n\nresume2=swap:/dev/hda1\n\n"
+			"in lilo.conf or equivalent. (Where /dev/hda1 is your "
+			"swap partition).\n");
+		set_result_state(SUSPEND_ABORTED);
+		return 0;
+	}
+	
+	return 1;
+}
+

--
Nigel Cunningham		nigel at suspend2 dot net
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