[PATCH] swsusp: debugging

[sfrench/cifs-2.6.git] / kernel / power / disk.c

diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 7c7b9b65e365058935a5d5b77ac807b2d669df59..b1fb7866b0b31d65ccea5946aa22e9c2881e0322 100644 (file)
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -18,6 +18,7 @@
 #include <linux/fs.h>
 #include <linux/mount.h>
 #include <linux/pm.h>
+#include <linux/console.h>
 #include <linux/cpu.h>
 
 #include "power.h"
@@ -70,7 +71,7 @@ static inline void platform_finish(void)
 
 static int prepare_processes(void)
 {
-       int error;
+       int error = 0;
 
        pm_prepare_console();
 
@@ -83,6 +84,12 @@ static int prepare_processes(void)
                goto thaw;
        }
 
+       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. */
        if (!(error = swsusp_shrink_memory()))
                return 0;
@@ -103,7 +110,7 @@ static void unprepare_processes(void)
 }
 
 /**
- *     pm_suspend_disk - The granpappy of power management.
+ *     pm_suspend_disk - The granpappy of hibernation power management.
  *
  *     If we're going through the firmware, then get it over with quickly.
  *
@@ -119,11 +126,21 @@ int pm_suspend_disk(void)
        if (error)
                return error;
 
+       if (pm_disk_mode == PM_DISK_TESTPROC)
+               goto Thaw;
+
+       suspend_console();
        error = device_suspend(PMSG_FREEZE);
        if (error) {
+               resume_console();
                printk("Some devices failed to suspend\n");
-               unprepare_processes();
-               return error;
+               goto Thaw;
+       }
+
+       if (pm_disk_mode == PM_DISK_TEST) {
+               printk("swsusp debug: Waiting for 5 seconds.\n");
+               mdelay(5000);
+               goto Done;
        }
 
        pr_debug("PM: snapshotting memory.\n");
@@ -133,21 +150,24 @@ int pm_suspend_disk(void)
 
        if (in_suspend) {
                device_resume();
+               resume_console();
                pr_debug("PM: writing image.\n");
                error = swsusp_write();
                if (!error)
                        power_down(pm_disk_mode);
                else {
                        swsusp_free();
-                       unprepare_processes();
-                       return error;
+                       goto Thaw;
                }
-       } else
+       } else {
                pr_debug("PM: Image restored successfully.\n");
+       }
 
        swsusp_free();
  Done:
        device_resume();
+       resume_console();
+ Thaw:
        unprepare_processes();
        return error;
 }
@@ -212,7 +232,9 @@ static int software_resume(void)
 
        pr_debug("PM: Preparing devices for restore.\n");
 
-       if ((error = device_suspend(PMSG_FREEZE))) {
+       suspend_console();
+       if ((error = device_suspend(PMSG_PRETHAW))) {
+               resume_console();
                printk("Some devices failed to suspend\n");
                swsusp_free();
                goto Thaw;
@@ -224,6 +246,7 @@ static int software_resume(void)
        swsusp_resume();
        pr_debug("PM: Restore failed, recovering.n");
        device_resume();
+       resume_console();
  Thaw:
        unprepare_processes();
  Done:
@@ -241,6 +264,8 @@ static const char * const pm_disk_modes[] = {
        [PM_DISK_PLATFORM]      = "platform",
        [PM_DISK_SHUTDOWN]      = "shutdown",
        [PM_DISK_REBOOT]        = "reboot",
+       [PM_DISK_TEST]          = "test",
+       [PM_DISK_TESTPROC]      = "testproc",
 };
 
 /**
@@ -295,17 +320,19 @@ static ssize_t disk_store(struct subsystem * s, const char * buf, size_t n)
                }
        }
        if (mode) {
-               if (mode == PM_DISK_SHUTDOWN || mode == PM_DISK_REBOOT)
+               if (mode == PM_DISK_SHUTDOWN || mode == PM_DISK_REBOOT ||
+                    mode == PM_DISK_TEST || mode == PM_DISK_TESTPROC) {
                        pm_disk_mode = mode;
-               else {
+               } else {
                        if (pm_ops && pm_ops->enter &&
                            (mode == pm_ops->pm_disk_mode))
                                pm_disk_mode = mode;
                        else
                                error = -EINVAL;
                }
-       } else
+       } else {
                error = -EINVAL;
+       }
 
        pr_debug("PM: suspend-to-disk mode set to '%s'\n",
                 pm_disk_modes[mode]);