/**
* software_resume - Resume from a saved image.
*
* Called as a late_initcall (so all devices are discovered and
* initialized), we call swsusp to see if we have a saved image or not.
* If so, we quiesce devices, then restore the saved image. We will
* return above (in pm_suspend_disk() ) if everything goes well.
* Otherwise, we fail gracefully and return to the normally
* scheduled program.
*
*/
static int __init software_resume(void)
{
if (num_online_cpus() > 1) {
printk(KERN_WARNING "Software Suspend has malfunctioning SMP support. Disabled :(\n");
return -EINVAL;
}
/* We enable the possibility of machine suspend */
software_suspend_enabled = 1;
if (!resume_status)
return 0;
printk( "%s", name_resume );
if (resume_status == NORESUME) {
if(resume_file[0])
read_suspend_image(resume_file, 1);
printk( "disabled\n" );
return 0;
}
MDELAY(1000);
if (pm_prepare_console())
printk("swsusp: Can't allocate a console... proceeding\n");
if (!resume_file[0] && resume_status == RESUME_SPECIFIED) {
printk( "suspension device unspecified\n" );
return -EINVAL;
}
printk( "resuming from %s\n", resume_file);
if (read_suspend_image(resume_file, 0))
goto read_failure;
do_magic(1);
panic("This never returns");
read_failure:
pm_restore_console();
return 0;
}
int __init pmdisk_read(void)
{
int error;
if (!strlen(resume_file))
return -ENOENT;
resume_device = name_to_dev_t(resume_file);
pr_debug("pmdisk: Resume From Partition: %s\n", resume_file);
resume_bdev = open_by_devnum(resume_device, FMODE_READ);
if (!IS_ERR(resume_bdev)) {
set_blocksize(resume_bdev, PAGE_SIZE);
error = read_suspend_image();
blkdev_put(resume_bdev);
} else
error = PTR_ERR(resume_bdev);
if (!error)
pr_debug("Reading resume file was successful\n");
else
pr_debug("pmdisk: Error %d resuming\n", error);
return error;
}