cpuidle: fix AMD C1E suspend hang
When AMD C1E is enabled, local APIC timer will stop even in C1. To avoid suspend/resume hang, this patch removes C1 and replace it with a cpu_relax() in suspend/resume path. This hasn't any impact in runtime path. http://bugzilla.kernel.org/show_bug.cgi?id=13233 [ impact: avoid suspend/resume hang in AMD CPU with C1E enabled ] Tested-by: Dmitry Lyzhyn <thisistempbox@yahoo.com> Signed-off-by: Shaohua Li <shaohua.li@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
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@ -834,8 +834,8 @@ static int acpi_idle_enter_c1(struct cpuidle_device *dev,
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/* Do not access any ACPI IO ports in suspend path */
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/* Do not access any ACPI IO ports in suspend path */
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if (acpi_idle_suspend) {
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if (acpi_idle_suspend) {
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acpi_safe_halt();
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local_irq_enable();
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local_irq_enable();
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cpu_relax();
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return 0;
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return 0;
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}
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}
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