sparc64: Fix reset hangs on Niagara systems.

Hypervisor versions older than version 1.6.1 cannot handle
leaving the profile counter overflow interrupt chirping
when the system does a soft reset.

So use a reboot notifier to shut off the NMI watchdog.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 22 insertions, 1 deletions

diff --git a/arch/sparc/kernel/nmi.c b/arch/sparc/kernel/nmi.c
index f3577223c863..2c0cc72d295b 100644
--- a/arch/sparc/kernel/nmi.c
+++ b/arch/sparc/kernel/nmi.c
@@ -13,6 +13,7 @@
 #include <linux/module.h>
 #include <linux/kprobes.h>
 #include <linux/kernel_stat.h>
+#include <linux/reboot.h>
 #include <linux/slab.h>
 #include <linux/kdebug.h>
 #include <linux/delay.h>
@@ -206,13 +207,33 @@ void nmi_adjust_hz(unsigned int new_hz)
 }
 EXPORT_SYMBOL_GPL(nmi_adjust_hz);
 
+static int nmi_shutdown(struct notifier_block *nb, unsigned long cmd, void *p)
+{
+        on_each_cpu(stop_watchdog, NULL, 1);
+        return 0;
+}
+
+static struct notifier_block nmi_reboot_notifier = {
+        .notifier_call = nmi_shutdown,
+};
+
 int __init nmi_init(void)
 {
+        int err;
+
         nmi_usable = 1;
 
         on_each_cpu(start_watchdog, NULL, 1);
 
-        return check_nmi_watchdog();
+        err = check_nmi_watchdog();
+        if (!err) {
+                err = register_reboot_notifier(&nmi_reboot_notifier);
+                if (err) {
+                        nmi_usable = 0;
+                        on_each_cpu(stop_watchdog, NULL, 1);
+                }
+        }
+        return err;
 }
 
 static int __init setup_nmi_watchdog(char *str)