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authorFenghua Yu <fenghua.yu@intel.com>2013-10-23 18:30:12 -0700
committerIngo Molnar <mingo@kernel.org>2013-11-07 10:12:37 +0100
commit522e66464467543c0d88d023336eec4df03ad40b (patch)
treec71b6dafc9aefc97d4a65f2a6c1f2ef0799e5197 /arch/x86/kernel
parent5e01dc7b26d9f24f39abace5da98ccbd6a5ceb52 (diff)
x86/apic: Disable I/O APIC before shutdown of the local APIC
In reboot and crash path, when we shut down the local APIC, the I/O APIC is still active. This may cause issues because external interrupts can still come in and disturb the local APIC during shutdown process. To quiet external interrupts, disable I/O APIC before shutdown local APIC. Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Link: http://lkml.kernel.org/r/1382578212-4677-1-git-send-email-fenghua.yu@intel.com Cc: <stable@kernel.org> [ I suppose the 'issue' is a hang during shutdown. It's a fine change nevertheless. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel')
-rw-r--r--arch/x86/kernel/crash.c2
-rw-r--r--arch/x86/kernel/reboot.c8
2 files changed, 5 insertions, 5 deletions
diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
index e0e0841eef4..18677a90d6a 100644
--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -127,12 +127,12 @@ void native_machine_crash_shutdown(struct pt_regs *regs)
cpu_emergency_vmxoff();
cpu_emergency_svm_disable();
- lapic_shutdown();
#ifdef CONFIG_X86_IO_APIC
/* Prevent crash_kexec() from deadlocking on ioapic_lock. */
ioapic_zap_locks();
disable_IO_APIC();
#endif
+ lapic_shutdown();
#ifdef CONFIG_HPET_TIMER
hpet_disable();
#endif
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 7e920bff99a..618ce264b23 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -550,6 +550,10 @@ static void native_machine_emergency_restart(void)
void native_machine_shutdown(void)
{
/* Stop the cpus and apics */
+#ifdef CONFIG_X86_IO_APIC
+ disable_IO_APIC();
+#endif
+
#ifdef CONFIG_SMP
/*
* Stop all of the others. Also disable the local irq to
@@ -562,10 +566,6 @@ void native_machine_shutdown(void)
lapic_shutdown();
-#ifdef CONFIG_X86_IO_APIC
- disable_IO_APIC();
-#endif
-
#ifdef CONFIG_HPET_TIMER
hpet_disable();
#endif