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| author | Shaohua Li <shaohua.li@intel.com> | 2009-05-19 16:09:54 +0800 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-05-26 23:45:33 -0400 |
| commit | 7d60e8ab0d5507229dfbdf456501cc378610fa01 (patch) | |
| tree | 008fe5442f841fd555b7fa43253c166f2b5c8099 /drivers | |
| parent | 87ad57bacb25c3f24c54f142ef445f68277705f0 (diff) | |
| download | linux-7d60e8ab0d5507229dfbdf456501cc378610fa01.tar.gz linux-7d60e8ab0d5507229dfbdf456501cc378610fa01.tar.bz2 linux-7d60e8ab0d5507229dfbdf456501cc378610fa01.zip | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/processor_idle.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index 6b7bcc7e3e1d..10a2d913635a 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -834,8 +834,8 @@ static int acpi_idle_enter_c1(struct cpuidle_device *dev, /* Do not access any ACPI IO ports in suspend path */ if (acpi_idle_suspend) { - acpi_safe_halt(); local_irq_enable(); + cpu_relax(); return 0; } |