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ACPICA: Remove unused ACPI_FREE_BUFFER macro. No functional change.

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This macro is no longer used by ACPICA and it is not public.
Also update comments related to the use of ACPI_ALLOCATE_BUFFER and
the use of acpi_os_free (kfree is equivalent and prefered in the
kernel) to free the buffer.

Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lv Zheng 2014-01-08 13:43:23 +08:00 committed by Rafael J. Wysocki
parent 5af2b6351b
commit bb3fec146c
3 changed files with 22 additions and 23 deletions
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23
drivers/acpi/acpica/nsxfeval.c
View file

@ -84,7 +84,7 @@ acpi_evaluate_object_typed(acpi_handle handle,
acpi_object_type return_type)
{
acpi_status status;
u8 must_free = FALSE;
u8 free_buffer_on_error = FALSE;
ACPI_FUNCTION_TRACE(acpi_evaluate_object_typed);
@ -95,14 +95,13 @@ acpi_evaluate_object_typed(acpi_handle handle,
}
if (return_buffer->length == ACPI_ALLOCATE_BUFFER) {
must_free = TRUE;
free_buffer_on_error = TRUE;
}
/* Evaluate the object */
status =
acpi_evaluate_object(handle, pathname, external_params,
return_buffer);
status = acpi_evaluate_object(handle, pathname,
external_params, return_buffer);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
@ -135,11 +134,15 @@ acpi_evaluate_object_typed(acpi_handle handle,
pointer)->type),
acpi_ut_get_type_name(return_type)));
if (must_free) {
/* Caller used ACPI_ALLOCATE_BUFFER, free the return buffer */
ACPI_FREE_BUFFER(*return_buffer);
if (free_buffer_on_error) {
/*
* Free a buffer created via ACPI_ALLOCATE_BUFFER.
* Note: We use acpi_os_free here because acpi_os_allocate was used
* to allocate the buffer. This purposefully bypasses the
* (optionally enabled) allocation tracking mechanism since we
* only want to track internal allocations.
*/
acpi_os_free(return_buffer->pointer);
return_buffer->pointer = NULL;
}

10
drivers/acpi/acpica/utalloc.c
View file

@ -302,9 +302,13 @@ acpi_ut_initialize_buffer(struct acpi_buffer * buffer,
return (AE_BUFFER_OVERFLOW);
case ACPI_ALLOCATE_BUFFER:
/* Allocate a new buffer */
/*
* Allocate a new buffer. We directectly call acpi_os_allocate here to
* purposefully bypass the (optionally enabled) internal allocation
* tracking mechanism since we only want to track internal
* allocations. Note: The caller should use acpi_os_free to free this
* buffer created via ACPI_ALLOCATE_BUFFER.
*/
buffer->pointer = acpi_os_allocate(required_length);
break;

12
include/acpi/actypes.h
View file

@ -928,22 +928,14 @@ struct acpi_object_list {
* Miscellaneous common Data Structures used by the interfaces
*/
#define ACPI_NO_BUFFER 0
#define ACPI_ALLOCATE_BUFFER (acpi_size) (-1)
#define ACPI_ALLOCATE_LOCAL_BUFFER (acpi_size) (-2)
#define ACPI_ALLOCATE_BUFFER (acpi_size) (-1) /* Let ACPICA allocate buffer */
#define ACPI_ALLOCATE_LOCAL_BUFFER (acpi_size) (-2) /* For internal use only (enables tracking) */
struct acpi_buffer {
acpi_size length; /* Length in bytes of the buffer */
void *pointer; /* pointer to buffer */
};
/*
* Free a buffer created in an struct acpi_buffer via ACPI_ALLOCATE_BUFFER.
* Note: We use acpi_os_free here because acpi_os_allocate was used to allocate
* the buffer. This purposefully bypasses the internal allocation tracking
* mechanism (if it is enabled).
*/
#define ACPI_FREE_BUFFER(b) acpi_os_free((b).pointer)
/*
* name_type for acpi_get_name
*/