ACPI: check acpi_disabled in acpi_table_parse() and acpi_table_parse_entries()

Allow consumers of the acpi_table_parse()/acpi_table_parse_entries() API
to gracefully handle the acpi_disabled=1 case via return value
rather than checking the global flag themselves.

Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index 646d39c031ca..f336bca7c450 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -213,6 +213,9 @@ acpi_table_parse_entries(char *id,
         unsigned long table_end;
         acpi_size tbl_size;
 
+        if (acpi_disabled)
+                return -ENODEV;
+
         if (!handler)
                 return -EINVAL;
 
@@ -277,6 +280,9 @@ int __init acpi_table_parse(char *id, acpi_table_handler handler)
         struct acpi_table_header *table = NULL;
         acpi_size tbl_size;
 
+        if (acpi_disabled)
+                return -ENODEV;
+
         if (!handler)
                 return -EINVAL;