ACPICA: Update for mutiple global lock acquisitions by same thread

Allows AcpiAcquireGlobalLock external interface to be called
multiple times by the
 same thread. Allows use of AML fields that require the global
 lock while the running AML is already holding the global lock.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 8 insertions, 16 deletions

diff --git a/drivers/acpi/executer/exfield.c b/drivers/acpi/executer/exfield.c
index 2d88a3d8d1ad..e66b367c4fb6 100644
--- a/drivers/acpi/executer/exfield.c
+++ b/drivers/acpi/executer/exfield.c
@@ -71,7 +71,6 @@ acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
         union acpi_operand_object *buffer_desc;
         acpi_size length;
         void *buffer;
-        u8 locked;
 
         ACPI_FUNCTION_TRACE_PTR(ex_read_data_from_field, obj_desc);
 
@@ -111,9 +110,7 @@ acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
 
                 /* Lock entire transaction if requested */
 
-                locked =
-                    acpi_ex_acquire_global_lock(obj_desc->common_field.
-                                                field_flags);
+                acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
 
                 /*
                  * Perform the read.
@@ -125,7 +122,7 @@ acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
                                                              buffer.pointer),
                                                ACPI_READ | (obj_desc->field.
                                                             attribute << 16));
-                acpi_ex_release_global_lock(locked);
+                acpi_ex_release_global_lock();
                 goto exit;
         }
 
@@ -175,13 +172,12 @@ acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
 
         /* Lock entire transaction if requested */
 
-        locked =
-            acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
+        acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
 
         /* Read from the field */
 
         status = acpi_ex_extract_from_field(obj_desc, buffer, (u32) length);
-        acpi_ex_release_global_lock(locked);
+        acpi_ex_release_global_lock();
 
       exit:
         if (ACPI_FAILURE(status)) {
@@ -217,7 +213,6 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
         u32 required_length;
         void *buffer;
         void *new_buffer;
-        u8 locked;
         union acpi_operand_object *buffer_desc;
 
         ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc);
@@ -278,9 +273,7 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
 
                 /* Lock entire transaction if requested */
 
-                locked =
-                    acpi_ex_acquire_global_lock(obj_desc->common_field.
-                                                field_flags);
+                acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
 
                 /*
                  * Perform the write (returns status and perhaps data in the
@@ -291,7 +284,7 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
                                                (acpi_integer *) buffer,
                                                ACPI_WRITE | (obj_desc->field.
                                                              attribute << 16));
-                acpi_ex_release_global_lock(locked);
+                acpi_ex_release_global_lock();
 
                 *result_desc = buffer_desc;
                 return_ACPI_STATUS(status);
@@ -366,13 +359,12 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
 
         /* Lock entire transaction if requested */
 
-        locked =
-            acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
+        acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
 
         /* Write to the field */
 
         status = acpi_ex_insert_into_field(obj_desc, buffer, length);
-        acpi_ex_release_global_lock(locked);
+        acpi_ex_release_global_lock();
 
         /* Free temporary buffer if we used one */