Messages in this thread Patch in this message | | | Date | Thu, 7 Nov 2013 07:18:36 -0800 | From | tip-bot for Fenghua Yu <> | Subject | [tip:x86/apic] x86/apic: Disable I/ O APIC before shutdown of the local APIC |
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Commit-ID: 522e66464467543c0d88d023336eec4df03ad40b Gitweb: http://git.kernel.org/tip/522e66464467543c0d88d023336eec4df03ad40b Author: Fenghua Yu <fenghua.yu@intel.com> AuthorDate: Wed, 23 Oct 2013 18:30:12 -0700 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Thu, 7 Nov 2013 10:12:37 +0100
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> --- arch/x86/kernel/crash.c | 2 +- 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 e0e0841..18677a9 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 7e920bf..618ce26 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
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