diff options
| author | Fenghua Yu <fenghua.yu@intel.com> | 2013-10-24 05:30:12 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-11-07 13:12:37 +0400 |
| commit | 522e66464467543c0d88d023336eec4df03ad40b (patch) | |
| tree | c71b6dafc9aefc97d4a65f2a6c1f2ef0799e5197 | |
| parent | 5e01dc7b26d9f24f39abace5da98ccbd6a5ceb52 (diff) | |
| download | linux-522e66464467543c0d88d023336eec4df03ad40b.tar.xz | |
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>
| -rw-r--r-- | arch/x86/kernel/crash.c | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/reboot.c | 8 |
2 files changed, 5 insertions, 5 deletions
diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c index e0e0841eef45..18677a90d6a3 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 7e920bff99a3..618ce264b237 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 |