1 files changed, 32 insertions, 0 deletions

diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 45e8541ab7e3..4a4a206b1979 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -71,6 +71,14 @@ void hibernation_set_ops(struct platform_hibernation_ops *ops)
         mutex_unlock(&pm_mutex);
 }
 
+static bool entering_platform_hibernation;
+
+bool system_entering_hibernation(void)
+{
+        return entering_platform_hibernation;
+}
+EXPORT_SYMBOL(system_entering_hibernation);
+
 #ifdef CONFIG_PM_DEBUG
 static void hibernation_debug_sleep(void)
 {
@@ -219,6 +227,12 @@ static int create_image(int platform_mode)
                         "aborting hibernation\n");
                 goto Enable_irqs;
         }
+        sysdev_suspend(PMSG_FREEZE);
+        if (error) {
+                printk(KERN_ERR "PM: Some devices failed to power down, "
+                        "aborting hibernation\n");
+                goto Power_up_devices;
+        }
 
         if (hibernation_test(TEST_CORE))
                 goto Power_up;
@@ -234,9 +248,11 @@ static int create_image(int platform_mode)
         if (!in_suspend)
                 platform_leave(platform_mode);
  Power_up:
+        sysdev_resume();
         /* NOTE:  device_power_up() is just a resume() for devices
          * that suspended with irqs off ... no overall powerup.
          */
+ Power_up_devices:
         device_power_up(in_suspend ?
                 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
  Enable_irqs:
@@ -327,6 +343,7 @@ static int resume_target_kernel(void)
                         "aborting resume\n");
                 goto Enable_irqs;
         }
+        sysdev_suspend(PMSG_QUIESCE);
         /* We'll ignore saved state, but this gets preempt count (etc) right */
         save_processor_state();
         error = restore_highmem();
@@ -349,6 +366,7 @@ static int resume_target_kernel(void)
         swsusp_free();
         restore_processor_state();
         touch_softlockup_watchdog();
+        sysdev_resume();
         device_power_up(PMSG_RECOVER);
  Enable_irqs:
         local_irq_enable();
@@ -411,6 +429,7 @@ int hibernation_platform_enter(void)
         if (error)
                 goto Close;
 
+        entering_platform_hibernation = true;
         suspend_console();
         error = device_suspend(PMSG_HIBERNATE);
         if (error) {
@@ -431,6 +450,7 @@ int hibernation_platform_enter(void)
         local_irq_disable();
         error = device_power_down(PMSG_HIBERNATE);
         if (!error) {
+                sysdev_suspend(PMSG_HIBERNATE);
                 hibernation_ops->enter();
                 /* We should never get here */
                 while (1);
@@ -445,6 +465,7 @@ int hibernation_platform_enter(void)
  Finish:
         hibernation_ops->finish();
  Resume_devices:
+        entering_platform_hibernation = false;
         device_resume(PMSG_RESTORE);
         resume_console();
  Close:
@@ -585,6 +606,12 @@ static int software_resume(void)
         unsigned int flags;
 
         /*
+         * If the user said "noresume".. bail out early.
+         */
+        if (noresume)
+                return 0;
+
+        /*
          * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
          * is configured into the kernel. Since the regular hibernate
          * trigger path is via sysfs which takes a buffer mutex before
@@ -600,6 +627,11 @@ static int software_resume(void)
                         mutex_unlock(&pm_mutex);
                         return -ENOENT;
                 }
+                /*
+                 * Some device discovery might still be in progress; we need
+                 * to wait for this to finish.
+                 */
+                wait_for_device_probe();
                 swsusp_resume_device = name_to_dev_t(resume_file);
                 pr_debug("PM: Resume from partition %s\n", resume_file);
         } else {