[ACPI] Avoid BIOS inflicted crashes by evaluating _PDC only once

Linux invokes the AML _PDC method (Processor Driver Capabilities)
to tell the BIOS what features it can handle.  While the ACPI
spec says nothing about the OS invoking _PDC multiple times,
doing so with changing bits seems to hopelessly confuse the BIOS
on multiple platforms up to and including crashing the system.

Factor out the _PDC invocation so Linux invokes it only once.

http://bugzilla.kernel.org/show_bug.cgi?id=5483

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 0 insertions, 12 deletions

diff --git a/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c b/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
index edb9873e27e3..d93023438c4f 100644
--- a/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
+++ b/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
@@ -364,22 +364,10 @@ static struct acpi_processor_performance p;
  */
 static int centrino_cpu_init_acpi(struct cpufreq_policy *policy)
 {
-        union acpi_object               arg0 = {ACPI_TYPE_BUFFER};
-        u32                             arg0_buf[3];
-        struct acpi_object_list         arg_list = {1, &arg0};
         unsigned long                   cur_freq;
         int                             result = 0, i;
         unsigned int                    cpu = policy->cpu;
 
-        /* _PDC settings */
-        arg0.buffer.length = 12;
-        arg0.buffer.pointer = (u8 *) arg0_buf;
-        arg0_buf[0] = ACPI_PDC_REVISION_ID;
-        arg0_buf[1] = 1;
-        arg0_buf[2] = ACPI_PDC_EST_CAPABILITY_SMP_MSR;
-
-        p.pdc = &arg_list;
-
         /* register with ACPI core */
         if (acpi_processor_register_performance(&p, cpu)) {
                 dprintk(KERN_INFO PFX "obtaining ACPI data failed\n");