PM: Split up sysdev_[suspend|resume] from device_power_[down|up]

Move the sysdev_suspend/resume from the callee to the callers, with
no real change in semantics, so that we can rework the disabling of
interrupts during suspend/hibernation.

This is based on an earlier patch from Linus.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

8 files changed, 38 insertions, 7 deletions

diff --git a/arch/x86/kernel/apm_32.c b/arch/x86/kernel/apm_32.c
index 98807bb095a..266ec6c18b6 100644
--- a/arch/x86/kernel/apm_32.c
+++ b/arch/x86/kernel/apm_32.c
@@ -1192,6 +1192,7 @@ static int suspend(int vetoable)
         device_suspend(PMSG_SUSPEND);
         local_irq_disable();
         device_power_down(PMSG_SUSPEND);
+        sysdev_suspend(PMSG_SUSPEND);
 
         local_irq_enable();
 
@@ -1208,6 +1209,7 @@ static int suspend(int vetoable)
         if (err != APM_SUCCESS)
                 apm_error("suspend", err);
         err = (err == APM_SUCCESS) ? 0 : -EIO;
+        sysdev_resume();
         device_power_up(PMSG_RESUME);
         local_irq_enable();
         device_resume(PMSG_RESUME);
@@ -1228,6 +1230,7 @@ static void standby(void)
 
         local_irq_disable();
         device_power_down(PMSG_SUSPEND);
+        sysdev_suspend(PMSG_SUSPEND);
         local_irq_enable();
 
         err = set_system_power_state(APM_STATE_STANDBY);
@@ -1235,6 +1238,7 @@ static void standby(void)
                 apm_error("standby", err);
 
         local_irq_disable();
+        sysdev_resume();
         device_power_up(PMSG_RESUME);
         local_irq_enable();
 }
diff --git a/drivers/base/base.h b/drivers/base/base.h
index 0a5f055dffb..9f50f1b545d 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -88,8 +88,6 @@ extern void driver_detach(struct device_driver *drv);
 extern int driver_probe_device(struct device_driver *drv, struct device *dev);
 
 extern void sysdev_shutdown(void);
-extern int sysdev_suspend(pm_message_t state);
-extern int sysdev_resume(void);
 
 extern char *make_class_name(const char *name, struct kobject *kobj);
 
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 670c9d6c140..2d14f4ae6c0 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -333,7 +333,6 @@ static void dpm_power_up(pm_message_t state)
  */
 void device_power_up(pm_message_t state)
 {
-        sysdev_resume();
         dpm_power_up(state);
 }
 EXPORT_SYMBOL_GPL(device_power_up);
@@ -577,8 +576,6 @@ int device_power_down(pm_message_t state)
                 }
                 dev->power.status = DPM_OFF_IRQ;
         }
-        if (!error)
-                error = sysdev_suspend(state);
         if (error)
                 dpm_power_up(resume_event(state));
         return error;
diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
index 9b91617b958..56892a142ee 100644
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -45,6 +45,13 @@ static int xen_suspend(void *data)
                        err);
                 return err;
         }
+        err = sysdev_suspend(PMSG_SUSPEND);
+        if (err) {
+                printk(KERN_ERR "xen_suspend: sysdev_suspend failed: %d\n",
+                        err);
+                device_power_up(PMSG_RESUME);
+                return err;
+        }
 
         xen_mm_pin_all();
         gnttab_suspend();
@@ -61,6 +68,7 @@ static int xen_suspend(void *data)
         gnttab_resume();
         xen_mm_unpin_all();
 
+        sysdev_resume();
         device_power_up(PMSG_RESUME);
 
         if (!*cancelled) {
diff --git a/include/linux/pm.h b/include/linux/pm.h
index de2e0a8f672..24ba5f67b3a 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -381,10 +381,12 @@ struct dev_pm_info {
 
 #ifdef CONFIG_PM_SLEEP
 extern void device_pm_lock(void);
+extern int sysdev_resume(void);
 extern void device_power_up(pm_message_t state);
 extern void device_resume(pm_message_t state);
 
 extern void device_pm_unlock(void);
+extern int sysdev_suspend(pm_message_t state);
 extern int device_power_down(pm_message_t state);
 extern int device_suspend(pm_message_t state);
 extern int device_prepare_suspend(pm_message_t state);
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 8a6d7b08864..48389957825 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1465,6 +1465,11 @@ int kernel_kexec(void)
                 error = device_power_down(PMSG_FREEZE);
                 if (error)
                         goto Enable_irqs;
+
+                /* Suspend system devices */
+                error = sysdev_suspend(PMSG_FREEZE);
+                if (error)
+                        goto Power_up_devices;
         } else
 #endif
         {
@@ -1477,6 +1482,8 @@ int kernel_kexec(void)
 
 #ifdef CONFIG_KEXEC_JUMP
         if (kexec_image->preserve_context) {
+                sysdev_resume();
+ Power_up_devices:
                 device_power_up(PMSG_RESTORE);
  Enable_irqs:
                 local_irq_enable();
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 7b40e94b1d4..4a4a206b197 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -227,6 +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;
@@ -242,9 +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:
@@ -335,6 +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();
@@ -357,6 +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();
@@ -440,6 +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);
diff --git a/kernel/power/main.c b/kernel/power/main.c
index b4d219016b6..c9632f841f6 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -298,8 +298,12 @@ static int suspend_enter(suspend_state_t state)
                 goto Done;
         }
 
-        if (!suspend_test(TEST_CORE))
-                error = suspend_ops->enter(state);
+        error = sysdev_suspend(PMSG_SUSPEND);
+        if (!error) {
+                if (!suspend_test(TEST_CORE))
+                        error = suspend_ops->enter(state);
+                sysdev_resume();
+        }
 
         device_power_up(PMSG_RESUME);
  Done: