[Suspend2][ 09/10] [Suspend2] Atomic copy highlevel routine.

[Nigel Cunningham <nigel@suspend2.net>]

This routine essentially duplicates the swsusp_suspend routine, which does
high level steps of the atomic copy. Rather than modifying that routine to
include a number of if (suspend2) else clauses, it seemed better to put a
suspend2ised copy here.

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

 kernel/power/atomic_copy.c |   31 +++++++++++++++++++++++++++++++
 1 files changed, 31 insertions(+), 0 deletions(-)

diff --git a/kernel/power/atomic_copy.c b/kernel/power/atomic_copy.c
index 75e3beb..bb5d74f 100644
--- a/kernel/power/atomic_copy.c
+++ b/kernel/power/atomic_copy.c
@@ -349,3 +349,34 @@ void suspend_copy_pageset1(void)
 	}
 }
 
+int suspend2_suspend(void)
+{
+	int error;
+
+	if ((error = arch_prepare_suspend()))
+		return error;
+	local_irq_disable();
+	/* At this point, device_suspend() has been called, but *not*
+	 * device_power_down(). We *must* device_power_down() now.
+	 * Otherwise, drivers for some devices (e.g. interrupt controllers)
+	 * become desynchronized with the actual state of the hardware
+	 * at resume time, and evil weirdness ensues.
+	 */
+	if ((error = device_power_down(PMSG_FREEZE))) {
+		printk(KERN_ERR "Some devices failed to power down, aborting suspend\n");
+		goto enable_irqs;
+	}
+
+	save_processor_state();
+	if ((error = swsusp_arch_suspend()))
+		printk(KERN_ERR "Error %d suspending\n", error);
+	/* Restore control flow appears here */
+	restore_processor_state();
+	if (!suspend2_in_suspend)
+		copyback_high();
+	device_power_up();
+enable_irqs:
+	local_irq_enable();
+	return error;
+}
+

--
Nigel Cunningham		nigel at suspend2 dot net