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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-12-16 16:11:28 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-12-16 16:11:28 -0800 |
| commit | 138a6d7ea2deb3080116a4f99019e181b62e5ce5 (patch) | |
| tree | 424622059405352935fbf1dde015a1e130b56198 /arch/x86/kernel/reboot.c | |
| parent | 4fc6069e7df873bda9baabe0fa9f0be23363159a (diff) | |
| parent | 319e2e3f63c348a9b66db4667efa73178e18b17d (diff) | |
| download | linux-next-138a6d7ea2deb3080116a4f99019e181b62e5ce5.tar.gz linux-next-138a6d7ea2deb3080116a4f99019e181b62e5ce5.zip | |
Merge 3.13-rc4 into char-misc-next
We want these fixes in here.
Diffstat (limited to 'arch/x86/kernel/reboot.c')
| -rw-r--r-- | arch/x86/kernel/reboot.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c index da3c599584a3..c752cb43e52f 100644 --- a/arch/x86/kernel/reboot.c +++ b/arch/x86/kernel/reboot.c @@ -558,6 +558,17 @@ void native_machine_shutdown(void) { /* Stop the cpus and apics */ #ifdef CONFIG_X86_IO_APIC + /* + * Disabling IO APIC before local APIC is a workaround for + * erratum AVR31 in "Intel Atom Processor C2000 Product Family + * Specification Update". In this situation, interrupts that target + * a Logical Processor whose Local APIC is either in the process of + * being hardware disabled or software disabled are neither delivered + * nor discarded. When this erratum occurs, the processor may hang. + * + * Even without the erratum, it still makes sense to quiet IO APIC + * before disabling Local APIC. + */ disable_IO_APIC(); #endif |