| From 7d60e8ab0d5507229dfbdf456501cc378610fa01 Mon Sep 17 00:00:00 2001 |
| From: Shaohua Li <shaohua.li@intel.com> |
| Date: Tue, 19 May 2009 16:09:54 +0800 |
| Subject: cpuidle: fix AMD C1E suspend hang |
| |
| From: Shaohua Li <shaohua.li@intel.com> |
| |
| commit 7d60e8ab0d5507229dfbdf456501cc378610fa01 upstream. |
| |
| 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> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> |
| |
| --- |
| drivers/acpi/processor_idle.c | 2 +- |
| 1 file changed, 1 insertion(+), 1 deletion(-) |
| |
| --- a/drivers/acpi/processor_idle.c |
| +++ b/drivers/acpi/processor_idle.c |
| @@ -870,8 +870,8 @@ static int acpi_idle_enter_c1(struct cpu |
| |
| /* Do not access any ACPI IO ports in suspend path */ |
| if (acpi_idle_suspend) { |
| - acpi_safe_halt(); |
| local_irq_enable(); |
| + cpu_relax(); |
| return 0; |
| } |
| |
