Hibernation: Move low level resume to disk.c
Move the low level restore code to kernel/power/disk.c , since the
corresponding low level hibernation code is already there.
Make restore fail if device_power_down(PMSG_PRETHAW) returns an
error.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 0866b16..2a4bada 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -275,6 +275,53 @@
}
/**
+ * resume_target_kernel - prepare devices that need to be suspended with
+ * interrupts off, restore the contents of highmem that have not been
+ * restored yet from the image and run the low level code that will restore
+ * the remaining contents of memory and switch to the just restored target
+ * kernel.
+ */
+
+static int resume_target_kernel(void)
+{
+ int error;
+
+ local_irq_disable();
+ error = device_power_down(PMSG_PRETHAW);
+ if (error) {
+ printk(KERN_ERR "Some devices failed to power down, "
+ "aborting resume\n");
+ goto Enable_irqs;
+ }
+ /* We'll ignore saved state, but this gets preempt count (etc) right */
+ save_processor_state();
+ error = restore_highmem();
+ if (!error) {
+ error = swsusp_arch_resume();
+ /*
+ * The code below is only ever reached in case of a failure.
+ * Otherwise execution continues at place where
+ * swsusp_arch_suspend() was called
+ */
+ BUG_ON(!error);
+ /* This call to restore_highmem() undos the previous one */
+ restore_highmem();
+ }
+ /*
+ * The only reason why swsusp_arch_resume() can fail is memory being
+ * very tight, so we have to free it as soon as we can to avoid
+ * subsequent failures
+ */
+ swsusp_free();
+ restore_processor_state();
+ touch_softlockup_watchdog();
+ device_power_up();
+ Enable_irqs:
+ local_irq_enable();
+ return error;
+}
+
+/**
* hibernation_restore - quiesce devices and restore the hibernation
* snapshot image. If successful, control returns in hibernation_snaphot()
* @platform_mode - if set, use the platform driver, if available, to
@@ -297,7 +344,7 @@
if (!error) {
error = disable_nonboot_cpus();
if (!error)
- error = swsusp_resume();
+ error = resume_target_kernel();
enable_nonboot_cpus();
}
platform_restore_cleanup(platform_mode);