ACPI: Ignore invalid _PSS entries, but use valid ones

The EliteBook 8560W has non-initialized entries in its _PSS ACPI
table. Instead of bailing out when the first non-initialized entry is
found, ignore it and use only  the valid entries. Only bail out if there
is no valid entry at all.

[v3: Fixes suggested by Konrad]

Signed-off-by: Marco Aurelio da Costa <costa@gamic.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 25 insertions, 5 deletions

diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
index 0af48a8554c..a093dc163a4 100644
--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c
@@ -333,6 +333,7 @@ static int acpi_processor_get_performance_states(struct acpi_processor *pr)
         struct acpi_buffer state = { 0, NULL };
         union acpi_object *pss = NULL;
         int i;
+        int last_invalid = -1;
 
 
         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
@@ -394,14 +395,33 @@ static int acpi_processor_get_performance_states(struct acpi_processor *pr)
                     ((u32)(px->core_frequency * 1000) !=
                      (px->core_frequency * 1000))) {
                         printk(KERN_ERR FW_BUG PREFIX
-                               "Invalid BIOS _PSS frequency: 0x%llx MHz\n",
-                               px->core_frequency);
-                        result = -EFAULT;
-                        kfree(pr->performance->states);
-                        goto end;
+                               "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
+                               pr->id, px->core_frequency);
+                        if (last_invalid == -1)
+                                last_invalid = i;
+                } else {
+                        if (last_invalid != -1) {
+                                /*
+                                 * Copy this valid entry over last_invalid entry
+                                 */
+                                memcpy(&(pr->performance->states[last_invalid]),
+                                       px, sizeof(struct acpi_processor_px));
+                                ++last_invalid;
+                        }
                 }
         }
 
+        if (last_invalid == 0) {
+                printk(KERN_ERR FW_BUG PREFIX
+                       "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
+                result = -EFAULT;
+                kfree(pr->performance->states);
+                pr->performance->states = NULL;
+        }
+
+        if (last_invalid > 0)
+                pr->performance->state_count = last_invalid;
+
       end:
         kfree(buffer.pointer);