{
int error;
+ /* The snapshot device should not be opened while we're running */
+ if (!atomic_add_unless(&snapshot_device_available, -1, 0))
+ return -EBUSY;
+
+ /* Allocate memory management structures */
+ error = create_basic_memory_bitmaps();
+ if (error)
+ goto Exit;
+
error = prepare_processes();
if (error)
- return error;
+ goto Finish;
if (pm_disk_mode == PM_DISK_TESTPROC) {
printk("swsusp debug: Waiting for 5 seconds.\n");
mdelay(5000);
goto Thaw;
}
+
/* Free memory before shutting down devices. */
error = swsusp_shrink_memory();
if (error)
resume_console();
Thaw:
unprepare_processes();
+ Finish:
+ free_basic_memory_bitmaps();
+ Exit:
+ atomic_inc(&snapshot_device_available);
return error;
}
}
pr_debug("PM: Checking swsusp image.\n");
-
error = swsusp_check();
if (error)
- goto Done;
+ goto Unlock;
- pr_debug("PM: Preparing processes for restore.\n");
+ /* The snapshot device should not be opened while we're running */
+ if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
+ error = -EBUSY;
+ goto Unlock;
+ }
+ error = create_basic_memory_bitmaps();
+ if (error)
+ goto Finish;
+
+ pr_debug("PM: Preparing processes for restore.\n");
error = prepare_processes();
if (error) {
swsusp_close();
printk(KERN_ERR "PM: Restore failed, recovering.\n");
unprepare_processes();
Done:
+ free_basic_memory_bitmaps();
+ Finish:
+ atomic_inc(&snapshot_device_available);
/* For success case, the suspend path will release the lock */
+ Unlock:
mutex_unlock(&pm_mutex);
pr_debug("PM: Resume from disk failed.\n");
return 0;
static ssize_t disk_show(struct kset *kset, char *buf)
{
- return sprintf(buf, "%s\n", pm_disk_modes[pm_disk_mode]);
+ int i;
+ char *start = buf;
+
+ for (i = PM_DISK_PLATFORM; i < PM_DISK_MAX; i++) {
+ if (!pm_disk_modes[i])
+ continue;
+ switch (i) {
+ case PM_DISK_SHUTDOWN:
+ case PM_DISK_REBOOT:
+ case PM_DISK_TEST:
+ case PM_DISK_TESTPROC:
+ break;
+ default:
+ if (pm_ops && pm_ops->enter &&
+ (i == pm_ops->pm_disk_mode))
+ break;
+ /* not a valid mode, continue with loop */
+ continue;
+ }
+ if (i == pm_disk_mode)
+ buf += sprintf(buf, "[%s]", pm_disk_modes[i]);
+ else
+ buf += sprintf(buf, "%s", pm_disk_modes[i]);
+ if (i+1 != PM_DISK_MAX)
+ buf += sprintf(buf, " ");
+ }
+ buf += sprintf(buf, "\n");
+ return buf-start;
}