+ cls_objects = obj_desc->package.elements;
+
+ if (obj_desc->common.type == ACPI_TYPE_PACKAGE &&
+ obj_desc->package.count == 3 &&
+ cls_objects[0]->common.type == ACPI_TYPE_INTEGER &&
+ cls_objects[1]->common.type == ACPI_TYPE_INTEGER &&
+ cls_objects[2]->common.type == ACPI_TYPE_INTEGER) {
+
+ /* Allocate a buffer for the CLS */
+ cls = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_pnp_device_id) +
+ (acpi_size) 7);
I would like to see an error returned if an object or subobject is of the incorrect type.
Then, the caller knows not to attempt to look at it.
> -----Original Message-----
> From: Suravee Suthikulpanit [mailto:Suravee.Suthikulpanit@xxxxxxx]
> Sent: Thursday, March 26, 2015 12:13 PM
> To: rjw@xxxxxxxxxxxxx; mika.westerberg@xxxxxxxxxxxxxxx; Moore, Robert;
> Zheng, Lv; hanjun.guo@xxxxxxxxxx
> Cc: lenb@xxxxxxxxxx; hdegoede@xxxxxxxxxx; tj@xxxxxxxxxx;
> mjg59@xxxxxxxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx; al.stone@xxxxxxxxxx;
> graeme.gregory@xxxxxxxxxx; leo.duran@xxxxxxx; linux-ide@xxxxxxxxxxxxxxx;
> linux-acpi@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linaro-
> acpi@xxxxxxxxxxxxxxxx; Suravee Suthikulpanit
> Subject: [V7 PATCH 1/3] ACPICA: Add ACPI _CLS processing
>
> ACPI Device configuration often contain _CLS object to suppy PCI-defined
> class code for the device. This patch introduces logic to process the _CLS
> object.
>
> Acked-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
> Reviewed-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
> ---
> drivers/acpi/acpica/acutils.h | 3 ++
> drivers/acpi/acpica/nsxfname.c | 21 +++++++++++--
> drivers/acpi/acpica/utids.c | 71
> ++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 93 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/acpi/acpica/acutils.h b/drivers/acpi/acpica/acutils.h
> index c2f03e8..2aef850 100644
> --- a/drivers/acpi/acpica/acutils.h
> +++ b/drivers/acpi/acpica/acutils.h
> @@ -430,6 +430,9 @@ acpi_status
> acpi_ut_execute_CID(struct acpi_namespace_node *device_node,
> struct acpi_pnp_device_id_list ** return_cid_list);
>
> +acpi_status
> +acpi_ut_execute_CLS(struct acpi_namespace_node *device_node,
> + struct acpi_pnp_device_id **return_id);
> /*
> * utlock - reader/writer locks
> */
> diff --git a/drivers/acpi/acpica/nsxfname.c
> b/drivers/acpi/acpica/nsxfname.c index d66c326..590ef06 100644
> --- a/drivers/acpi/acpica/nsxfname.c
> +++ b/drivers/acpi/acpica/nsxfname.c
> @@ -276,11 +276,12 @@ acpi_get_object_info(acpi_handle handle,
> struct acpi_pnp_device_id *hid = NULL;
> struct acpi_pnp_device_id *uid = NULL;
> struct acpi_pnp_device_id *sub = NULL;
> + struct acpi_pnp_device_id *cls = NULL;
> char *next_id_string;
> acpi_object_type type;
> acpi_name name;
> u8 param_count = 0;
> - u8 valid = 0;
> + u16 valid = 0;
> u32 info_size;
> u32 i;
> acpi_status status;
> @@ -320,7 +321,7 @@ acpi_get_object_info(acpi_handle handle,
> if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) {
> /*
> * Get extra info for ACPI Device/Processor objects only:
> - * Run the Device _HID, _UID, _SUB, and _CID methods.
> + * Run the Device _HID, _UID, _SUB, _CID and _CLS methods.
> *
> * Note: none of these methods are required, so they may or
> may
> * not be present for this device. The Info->Valid bitfield is
> used @@ -351,6 +352,14 @@ acpi_get_object_info(acpi_handle handle,
> valid |= ACPI_VALID_SUB;
> }
>
> + /* Execute the Device._CLS method */
> +
> + status = acpi_ut_execute_CLS(node, &cls);
> + if (ACPI_SUCCESS(status)) {
> + info_size += cls->length;
> + valid |= ACPI_VALID_CLS;
> + }
> +
> /* Execute the Device._CID method */
>
> status = acpi_ut_execute_CID(node, &cid_list); @@ -468,6
> +477,11 @@ acpi_get_object_info(acpi_handle handle,
> sub, next_id_string);
> }
>
> + if (cls) {
> + next_id_string = acpi_ns_copy_device_id(&info->cls,
> + cls, next_id_string);
> + }
> +
> if (cid_list) {
> info->compatible_id_list.count = cid_list->count;
> info->compatible_id_list.list_size = cid_list->list_size; @@ -
> 507,6 +521,9 @@ cleanup:
> if (sub) {
> ACPI_FREE(sub);
> }
> + if (cls) {
> + ACPI_FREE(cls);
> + }
> if (cid_list) {
> ACPI_FREE(cid_list);
> }
> diff --git a/drivers/acpi/acpica/utids.c b/drivers/acpi/acpica/utids.c
> index 27431cf..a64b5d1 100644
> --- a/drivers/acpi/acpica/utids.c
> +++ b/drivers/acpi/acpica/utids.c
> @@ -416,3 +416,74 @@ cleanup:
> acpi_ut_remove_reference(obj_desc);
> return_ACPI_STATUS(status);
> }
> +
> +/**********************************************************************
> +*********
> + *
> + * FUNCTION: acpi_ut_execute_CLS
> + *
> + * PARAMETERS: device_node - Node for the device
> + * return_id - Where the string UID is returned
> + *
> + * RETURN: Status
> + *
> + * DESCRIPTION: Executes the _CLS control method that returns PCI-defined
> + * class code of the device. The ACPI spec define _CLS as a
> + * package with three integers. The returned string has
> format:
> + *
> + * "bbsspp"
> + * where:
> + * bb = Base-class code
> + * ss = Sub-class code
> + * pp = Programming Interface code
> + *
> +
> +***********************************************************************
> +*******/
> +
> +acpi_status
> +acpi_ut_execute_CLS(struct acpi_namespace_node *device_node,
> + struct acpi_pnp_device_id **return_id) {
> + struct acpi_pnp_device_id *cls;
> + union acpi_operand_object *obj_desc;
> + union acpi_operand_object **cls_objects;
> + acpi_status status;
> +
> + ACPI_FUNCTION_TRACE(ut_execute_CLS);
> + status = acpi_ut_evaluate_object(device_node, METHOD_NAME__CLS,
> + ACPI_BTYPE_PACKAGE, &obj_desc);
> + if (ACPI_FAILURE(status))
> + return_ACPI_STATUS(status);
> +
> + cls_objects = obj_desc->package.elements;
> +
> + if (obj_desc->common.type == ACPI_TYPE_PACKAGE &&
> + obj_desc->package.count == 3 &&
> + cls_objects[0]->common.type == ACPI_TYPE_INTEGER &&
> + cls_objects[1]->common.type == ACPI_TYPE_INTEGER &&
> + cls_objects[2]->common.type == ACPI_TYPE_INTEGER) {
> +
> + /* Allocate a buffer for the CLS */
> + cls = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_pnp_device_id) +
> + (acpi_size) 7);
> + if (!cls) {
> + status = AE_NO_MEMORY;
> + goto cleanup;
> + }
> +
> + cls->string =
> + ACPI_ADD_PTR(char, cls, sizeof(struct
> acpi_pnp_device_id));
> +
> + sprintf(cls->string, "%02x%02x%02x",
> + (u8)ACPI_TO_INTEGER(cls_objects[0]->integer.value),
> + (u8)ACPI_TO_INTEGER(cls_objects[1]->integer.value),
> + (u8)ACPI_TO_INTEGER(cls_objects[2]->integer.value));
> + cls->length = 7;
> + *return_id = cls;
> + }
> +
> +cleanup:
> +
> + /* On exit, we must delete the return object */
> +
> + acpi_ut_remove_reference(obj_desc);
> + return_ACPI_STATUS(status);
> +}
> --
> 2.1.0
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