1 files changed, 4 insertions, 31 deletions

diff --git a/drivers/acpi/apei/apei-base.c b/drivers/acpi/apei/apei-base.c
index e45350cb6ac8..e5d53b7ddc7e 100644
--- a/drivers/acpi/apei/apei-base.c
+++ b/drivers/acpi/apei/apei-base.c
@@ -596,33 +596,19 @@ int apei_read(u64 *val, struct acpi_generic_address *reg)
 {
         int rc;
         u64 address;
-        u32 tmp, width = reg->bit_width;
         acpi_status status;
 
         rc = apei_check_gar(reg, &address);
         if (rc)
                 return rc;
 
-        if (width == 64)
-                width = 32;     /* Break into two 32-bit transfers */
-
         *val = 0;
         switch(reg->space_id) {
         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
-                status = acpi_os_read_memory((acpi_physical_address)
-                                             address, &tmp, width);
+                status = acpi_os_read_memory64((acpi_physical_address)
+                                             address, val, reg->bit_width);
                 if (ACPI_FAILURE(status))
                         return -EIO;
-                *val = tmp;
-
-                if (reg->bit_width == 64) {
-                        /* Read the top 32 bits */
-                        status = acpi_os_read_memory((acpi_physical_address)
-                                                     (address + 4), &tmp, 32);
-                        if (ACPI_FAILURE(status))
-                                return -EIO;
-                        *val |= ((u64)tmp << 32);
-                }
                 break;
         case ACPI_ADR_SPACE_SYSTEM_IO:
                 status = acpi_os_read_port(address, (u32 *)val, reg->bit_width);
@@ -642,31 +628,18 @@ int apei_write(u64 val, struct acpi_generic_address *reg)
 {
         int rc;
         u64 address;
-        u32 width = reg->bit_width;
         acpi_status status;
 
         rc = apei_check_gar(reg, &address);
         if (rc)
                 return rc;
 
-        if (width == 64)
-                width = 32;     /* Break into two 32-bit transfers */
-
         switch (reg->space_id) {
         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
-                status = acpi_os_write_memory((acpi_physical_address)
-                                              address, ACPI_LODWORD(val),
-                                              width);
+                status = acpi_os_write_memory64((acpi_physical_address)
+                                              address, val, reg->bit_width);
                 if (ACPI_FAILURE(status))
                         return -EIO;
-
-                if (reg->bit_width == 64) {
-                        status = acpi_os_write_memory((acpi_physical_address)
-                                                      (address + 4),
-                                                      ACPI_HIDWORD(val), 32);
-                        if (ACPI_FAILURE(status))
-                                return -EIO;
-                }
                 break;
         case ACPI_ADR_SPACE_SYSTEM_IO:
                 status = acpi_os_write_port(address, val, reg->bit_width);