1 files changed, 45 insertions, 1 deletions

diff --git a/drivers/acpi/processor_pdc.c b/drivers/acpi/processor_pdc.c
index 30e4dc0cdf3..e306ba9aa34 100644
--- a/drivers/acpi/processor_pdc.c
+++ b/drivers/acpi/processor_pdc.c
@@ -125,6 +125,8 @@ acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
         return status;
 }
 
+static int early_pdc_done;
+
 void acpi_processor_set_pdc(acpi_handle handle)
 {
         struct acpi_object_list *obj_list;
@@ -132,6 +134,9 @@ void acpi_processor_set_pdc(acpi_handle handle)
         if (arch_has_acpi_pdc() == false)
                 return;
 
+        if (early_pdc_done)
+                return;
+
         obj_list = acpi_processor_alloc_pdc();
         if (!obj_list)
                 return;
@@ -144,6 +149,36 @@ void acpi_processor_set_pdc(acpi_handle handle)
 }
 EXPORT_SYMBOL_GPL(acpi_processor_set_pdc);
 
+static int early_pdc_optin;
+static int set_early_pdc_optin(const struct dmi_system_id *id)
+{
+        early_pdc_optin = 1;
+        return 0;
+}
+
+static int param_early_pdc_optin(char *s)
+{
+        early_pdc_optin = 1;
+        return 1;
+}
+__setup("acpi_early_pdc_eval", param_early_pdc_optin);
+
+static struct dmi_system_id __cpuinitdata early_pdc_optin_table[] = {
+        {
+        set_early_pdc_optin, "HP Envy", {
+        DMI_MATCH(DMI_BIOS_VENDOR, "Hewlett-Packard"),
+        DMI_MATCH(DMI_PRODUCT_NAME, "HP Envy") }, NULL},
+        {
+        set_early_pdc_optin, "HP Pavilion dv6", {
+        DMI_MATCH(DMI_BIOS_VENDOR, "Hewlett-Packard"),
+        DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dv6") }, NULL},
+        {
+        set_early_pdc_optin, "HP Pavilion dv7", {
+        DMI_MATCH(DMI_BIOS_VENDOR, "Hewlett-Packard"),
+        DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dv7") }, NULL},
+        {},
+};
+
 static acpi_status
 early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
 {
@@ -151,7 +186,7 @@ early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
         return AE_OK;
 }
 
-void acpi_early_processor_set_pdc(void)
+void __init acpi_early_processor_set_pdc(void)
 {
         /*
          * Check whether the system is DMI table. If yes, OSPM
@@ -159,7 +194,16 @@ void acpi_early_processor_set_pdc(void)
          */
         dmi_check_system(processor_idle_dmi_table);
 
+        /*
+         * Allow systems to opt-in to early _PDC evaluation.
+         */
+        dmi_check_system(early_pdc_optin_table);
+        if (!early_pdc_optin)
+                return;
+
         acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
                             ACPI_UINT32_MAX,
                             early_init_pdc, NULL, NULL, NULL);
+
+        early_pdc_done = 1;
 }