[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, 5 insertions, 17 deletions

diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index 7a00d5089de9..82a9b7d430ec 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -62,9 +62,6 @@ struct acpi_processor_power {
         u32 bm_activity;
         int count;
         struct acpi_processor_cx states[ACPI_PROCESSOR_MAX_POWER];
-
-        /* the _PDC objects passed by the driver, if any */
-        struct acpi_object_list *pdc;
 };
 
 /* Performance Management */
@@ -96,8 +93,6 @@ struct acpi_processor_performance {
         unsigned int state_count;
         struct acpi_processor_px *states;
 
-        /* the _PDC objects passed by the driver, if any */
-        struct acpi_object_list *pdc;
 };
 
 /* Throttling Control */
@@ -151,6 +146,9 @@ struct acpi_processor {
         struct acpi_processor_performance *performance;
         struct acpi_processor_throttling throttling;
         struct acpi_processor_limit limit;
+
+        /* the _PDC objects for this processor, if any */
+        struct acpi_object_list *pdc;
 };
 
 struct acpi_processor_errata {
@@ -178,22 +176,12 @@ int acpi_processor_notify_smm(struct module *calling_module);
 extern struct acpi_processor *processors[NR_CPUS];
 extern struct acpi_processor_errata errata;
 
-int acpi_processor_set_pdc(struct acpi_processor *pr,
-                           struct acpi_object_list *pdc_in);
+void arch_acpi_processor_init_pdc(struct acpi_processor *pr);
 
-#ifdef ARCH_HAS_POWER_PDC_INIT
-void acpi_processor_power_init_pdc(struct acpi_processor_power *pow,
-                                   unsigned int cpu);
+#ifdef ARCH_HAS_POWER_INIT
 void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags,
                                         unsigned int cpu);
 #else
-static inline void acpi_processor_power_init_pdc(struct acpi_processor_power
-                                                 *pow, unsigned int cpu)
-{
-        pow->pdc = NULL;
-        return;
-}
-
 static inline void acpi_processor_power_init_bm_check(struct
                                                       acpi_processor_flags
                                                       *flags, unsigned int cpu)