Add device_shutdown() calls to reboot and power off transitions (and let the user know)

drivers/base/power.c

@@ -29,6 +29,8 @@ int device_suspend(u32 state, u32 level)
 	struct device * prev = &device_root;
 	int error = 0;
 
+	printk(KERN_EMERG "Suspending Devices\n");
+
 	get_device(prev);
 
 	spin_lock(&device_lock);
@@ -82,6 +84,8 @@ void device_resume(u32 level)
 	}
 	spin_unlock(&device_root);
 	put_device(prev);
+
+	printk(KERN_EMERG "Devices Resumed\n");
 }
 
 /**
@@ -97,6 +101,8 @@ void device_shutdown(void)
 	struct device * dev;
 	struct device * prev = &device_root;
 
+	printk(KERN_EMERG "Shutting down devices\n");
+
 	get_device(prev);
 
 	spin_lock(&device_lock);

kernel/sys.c

@@ -15,6 +15,7 @@
 #include <linux/init.h>
 #include <linux/highuid.h>
 #include <linux/fs.h>
+#include <linux/device.h>
 
 #include <asm/uaccess.h>
 #include <asm/io.h>
@@ -298,6 +299,7 @@ asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void * arg)
 	switch (cmd) {
 	case LINUX_REBOOT_CMD_RESTART:
 		notifier_call_chain(&reboot_notifier_list, SYS_RESTART, NULL);
+		device_shutdown();
 		printk(KERN_EMERG "Restarting system.\n");
 		machine_restart(NULL);
 		break;
@@ -312,6 +314,7 @@ asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void * arg)
 
 	case LINUX_REBOOT_CMD_HALT:
 		notifier_call_chain(&reboot_notifier_list, SYS_HALT, NULL);
+		device_shutdown();
 		printk(KERN_EMERG "System halted.\n");
 		machine_halt();
 		do_exit(0);
@@ -319,6 +322,7 @@ asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void * arg)
 
 	case LINUX_REBOOT_CMD_POWER_OFF:
 		notifier_call_chain(&reboot_notifier_list, SYS_POWER_OFF, NULL);
+		device_shutdown();
 		printk(KERN_EMERG "Power down.\n");
 		machine_power_off();
 		do_exit(0);
@@ -332,6 +336,7 @@ asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void * arg)
 		buffer[sizeof(buffer) - 1] = '\0';
 
 		notifier_call_chain(&reboot_notifier_list, SYS_RESTART, buffer);
+		device_shutdown();
 		printk(KERN_EMERG "Restarting system with command '%s'.\n", buffer);
 		machine_restart(buffer);
 		break;