[PATCH 4/4] kgdb: x86: Detach gdb if machine shuts down or reboots

[Jan Kiszka <jan.kiszka@xxxxxxxxxxx>]

Hook into machine restart/power-off/halt handlers and call gdbstub_exit
so that a attached gdb frontend is properly informed. If kgdb is
disabled or no frontend attached, gdbstub_exit will do nothing.

CC: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CC: Ingo Molnar <mingo@xxxxxxxxxx>
CC: "H. Peter Anvin" <hpa@xxxxxxxxx>
CC: x86@xxxxxxxxxx
Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
---
 arch/x86/kernel/reboot.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index d840e69..926ac17 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -7,6 +7,7 @@
 #include <linux/sched.h>
 #include <linux/tboot.h>
 #include <linux/delay.h>
+#include <linux/kgdb.h>
 #include <acpi/reboot.h>
 #include <asm/io.h>
 #include <asm/apic.h>
@@ -683,6 +684,7 @@ void native_machine_shutdown(void)
 static void __machine_emergency_restart(int emergency)
 {
 	reboot_emergency = emergency;
+	gdbstub_exit(1);
 	machine_ops.emergency_restart();
 }
 
@@ -730,6 +732,7 @@ struct machine_ops machine_ops = {
 
 void machine_power_off(void)
 {
+	gdbstub_exit(0);
 	machine_ops.power_off();
 }
 
@@ -745,17 +748,20 @@ void machine_emergency_restart(void)
 
 void machine_restart(char *cmd)
 {
+	gdbstub_exit(0);
 	machine_ops.restart(cmd);
 }
 
 void machine_halt(void)
 {
+	gdbstub_exit(0);
 	machine_ops.halt();
 }
 
 #ifdef CONFIG_KEXEC
 void machine_crash_shutdown(struct pt_regs *regs)
 {
+	gdbstub_exit(1);
 	machine_ops.crash_shutdown(regs);
 }
 #endif
-- 
1.7.3.4

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