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| author | Mark Brown <broonie@linaro.org> | 2013-12-30 13:45:00 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2013-12-30 13:45:00 +0000 |
| commit | 68e67d97e1f91ed11e041b67f3a1336f518c608f (patch) | |
| tree | 1de288bc05f1cf1bfec20200a60ffe99dcce77ae /arch/x86/kernel/reboot.c | |
| parent | 9e03d05eee4ca45ed12749ef6c26bf616262cdd2 (diff) | |
| parent | 802eee95bde72fd0cd0f3a5b2098375a487d1eda (diff) | |
Merge tag 'v3.13-rc6' into spi-rcar
To resolve spurious merge conflicts with fixes.
Linux 3.13-rc6
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 da3c599584a..c752cb43e52 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 |