ACPI / PM: Make suspend_nvs_save() use acpi_os_map_memory()

It turns out that the NVS memory region that suspend_nvs_save()
attempts to map has been already mapped by acpi_os_map_memory(), so
suspend_nvs_save() should better use acpi_os_map_memory() for mapping
memory to avoid conflicts.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/acpi/nvs.c b/drivers/acpi/nvs.c
index 7d648092427e..54b6ab8040a6 100644
--- a/drivers/acpi/nvs.c
+++ b/drivers/acpi/nvs.c
@@ -12,6 +12,7 @@
 #include <linux/mm.h>
 #include <linux/slab.h>
 #include <linux/acpi.h>
+#include <acpi/acpiosxf.h>
 
 /*
  * Platforms, like ACPI, may want us to save some memory used by them during
@@ -79,7 +80,7 @@ void suspend_nvs_free(void)
                         free_page((unsigned long)entry->data);
                         entry->data = NULL;
                         if (entry->kaddr) {
-                                iounmap(entry->kaddr);
+                                acpi_os_unmap_memory(entry->kaddr, entry->size);
                                 entry->kaddr = NULL;
                         }
                 }
@@ -113,7 +114,8 @@ int suspend_nvs_save(void)
 
         list_for_each_entry(entry, &nvs_list, node)
                 if (entry->data) {
-                        entry->kaddr = ioremap(entry->phys_start, entry->size);
+                        entry->kaddr = acpi_os_map_memory(entry->phys_start,
+                                                          entry->size);
                         if (!entry->kaddr) {
                                 suspend_nvs_free();
                                 return -ENOMEM;