+ 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 -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html