kernel/sys.c: clean up sys_shutdown exit path

Impact: cleanup, fix

Clean up sys_shutdown() exit path.  Factor out common code.  Return
correct error code instead of always 0 on failure.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/sys.c b/kernel/sys.c
index 51dbb55..e7998cf 100644 (file)
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -360,6 +360,7 @@ SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd,
                void __user *, arg)
 {
        char buffer[256];
+       int ret = 0;
 
        /* We only trust the superuser with rebooting the system. */
        if (!capable(CAP_SYS_BOOT))
@@ -397,7 +398,7 @@ SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd,
                kernel_halt();
                unlock_kernel();
                do_exit(0);
-               break;
+               panic("cannot halt");
 
        case LINUX_REBOOT_CMD_POWER_OFF:
                kernel_power_off();
@@ -417,29 +418,22 @@ SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd,
 
 #ifdef CONFIG_KEXEC
        case LINUX_REBOOT_CMD_KEXEC:
-               {
-                       int ret;
-                       ret = kernel_kexec();
-                       unlock_kernel();
-                       return ret;
-               }
+               ret = kernel_kexec();
+               break;
 #endif
 
 #ifdef CONFIG_HIBERNATION
        case LINUX_REBOOT_CMD_SW_SUSPEND:
-               {
-                       int ret = hibernate();
-                       unlock_kernel();
-                       return ret;
-               }
+               ret = hibernate();
+               break;
 #endif
 
        default:
-               unlock_kernel();
-               return -EINVAL;
+               ret = -EINVAL;
+               break;
        }
        unlock_kernel();
-       return 0;
+       return ret;
 }
 
 static void deferred_cad(struct work_struct *dummy)