[POWERPC] Don't try to just continue if xmon has no input device

[sfrench/cifs-2.6.git] / arch / powerpc / xmon / xmon.c

diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 8adad1444a51f3fca949bc4d0e7ec3ead0f3d93e..708236f3474612a2aad9fc252a458cf1d270e7fc 100644 (file)
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -2,6 +2,8 @@
  * Routines providing a simple monitor for use on the PowerMac.
  *
  * Copyright (C) 1996-2005 Paul Mackerras.
+ * Copyright (C) 2001 PPC64 Team, IBM Corp
+ * Copyrignt (C) 2006 Michael Ellerman, IBM Corp
  *
  *      This program is free software; you can redistribute it and/or
  *      modify it under the terms of the GNU General Public License
@@ -503,7 +505,7 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
 
        mtmsr(msr);             /* restore interrupt enable */
 
-       return cmd != 'X';
+       return cmd != 'X' && cmd != EOF;
 }
 
 int xmon(struct pt_regs *excp)
@@ -2597,3 +2599,34 @@ static int __init setup_xmon_sysrq(void)
 }
 __initcall(setup_xmon_sysrq);
 #endif /* CONFIG_MAGIC_SYSRQ */
+
+int __initdata xmon_early, xmon_off;
+
+static int __init early_parse_xmon(char *p)
+{
+       if (!p || strncmp(p, "early", 5) == 0) {
+               /* just "xmon" is equivalent to "xmon=early" */
+               xmon_init(1);
+               xmon_early = 1;
+       } else if (strncmp(p, "on", 2) == 0)
+               xmon_init(1);
+       else if (strncmp(p, "off", 3) == 0)
+               xmon_off = 1;
+       else if (strncmp(p, "nobt", 4) == 0)
+               xmon_no_auto_backtrace = 1;
+       else
+               return 1;
+
+       return 0;
+}
+early_param("xmon", early_parse_xmon);
+
+void __init xmon_setup(void)
+{
+#ifdef CONFIG_XMON_DEFAULT
+       if (!xmon_off)
+               xmon_init(1);
+#endif
+       if (xmon_early)
+               debugger(NULL);
+}