1 files changed, 16 insertions, 19 deletions

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index cb838ca42c9..c76aaca5694 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -83,6 +83,8 @@ EXPORT_SYMBOL_GPL(used_vectors);
 
 static int ignore_nmis;
 
+int unknown_nmi_panic;
+
 static inline void conditional_sti(struct pt_regs *regs)
 {
         if (regs->flags & X86_EFLAGS_IF)
@@ -300,6 +302,13 @@ gp_in_kernel:
         die("general protection fault", regs, error_code);
 }
 
+static int __init setup_unknown_nmi_panic(char *str)
+{
+        unknown_nmi_panic = 1;
+        return 1;
+}
+__setup("unknown_nmi_panic", setup_unknown_nmi_panic);
+
 static notrace __kprobes void
 mem_parity_error(unsigned char reason, struct pt_regs *regs)
 {
@@ -342,9 +351,11 @@ io_check_error(unsigned char reason, struct pt_regs *regs)
         reason = (reason & 0xf) | 8;
         outb(reason, 0x61);
 
-        i = 2000;
-        while (--i)
-                udelay(1000);
+        i = 20000;
+        while (--i) {
+                touch_nmi_watchdog();
+                udelay(100);
+        }
 
         reason &= ~8;
         outb(reason, 0x61);
@@ -371,7 +382,7 @@ unknown_nmi_error(unsigned char reason, struct pt_regs *regs)
                         reason, smp_processor_id());
 
         printk(KERN_EMERG "Do you have a strange power saving mode enabled?\n");
-        if (panic_on_unrecovered_nmi)
+        if (unknown_nmi_panic || panic_on_unrecovered_nmi)
                 panic("NMI: Not continuing");
 
         printk(KERN_EMERG "Dazed and confused, but trying to continue\n");
@@ -397,20 +408,8 @@ static notrace __kprobes void default_do_nmi(struct pt_regs *regs)
                 if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT)
                                                         == NOTIFY_STOP)
                         return;
-
-#ifndef CONFIG_LOCKUP_DETECTOR
-                /*
-                 * Ok, so this is none of the documented NMI sources,
-                 * so it must be the NMI watchdog.
-                 */
-                if (nmi_watchdog_tick(regs, reason))
-                        return;
-                if (!do_nmi_callback(regs, cpu))
-#endif /* !CONFIG_LOCKUP_DETECTOR */
-                        unknown_nmi_error(reason, regs);
-#else
-                unknown_nmi_error(reason, regs);
 #endif
+                unknown_nmi_error(reason, regs);
 
                 return;
         }
@@ -446,14 +445,12 @@ do_nmi(struct pt_regs *regs, long error_code)
 
 void stop_nmi(void)
 {
-        acpi_nmi_disable();
         ignore_nmis++;
 }
 
 void restart_nmi(void)
 {
         ignore_nmis--;
-        acpi_nmi_enable();
 }
 
 /* May run on IST stack. */