iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ACPI: property: Move property ref argument parsing into a new function

Browse Source 
Split out property reference argument parsing out of the
__acpi_node_get_property_reference() function into a new one,
acpi_get_ref_args(). The new function will be needed also for parsing
string references soon.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Sakari Ailus 2022-07-11 14:26:02 +03:00 committed by Rafael J. Wysocki
parent 5ee772883a
commit 1aef25d9d1
1 changed files with 58 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

103
drivers/acpi/property.c
View File

@ -673,6 +673,58 @@ acpi_fwnode_get_named_child_node(const struct fwnode_handle *fwnode,
return NULL;
}
static int acpi_get_ref_args(struct fwnode_reference_args *args,
struct fwnode_handle *ref_fwnode,
const union acpi_object **element,
const union acpi_object *end, size_t num_args)
{
u32 nargs = 0, i;
/*
* Find the referred data extension node under the
* referred device node.
*/
for (; *element < end && (*element)->type == ACPI_TYPE_STRING;
(*element)++) {
const char *child_name = (*element)->string.pointer;
ref_fwnode = acpi_fwnode_get_named_child_node(ref_fwnode, child_name);
if (!ref_fwnode)
return -EINVAL;
}
/*
* Assume the following integer elements are all args. Stop counting on
* the first reference or end of the package arguments. In case of
* neither reference, nor integer, return an error, we can't parse it.
*/
for (i = 0; (*element) + i < end && i < num_args; i++) {
acpi_object_type type = (*element)[i].type;
if (type == ACPI_TYPE_LOCAL_REFERENCE)
break;
if (type == ACPI_TYPE_INTEGER)
nargs++;
else
return -EINVAL;
}
if (nargs > NR_FWNODE_REFERENCE_ARGS)
return -EINVAL;
if (args) {
args->fwnode = ref_fwnode;
args->nargs = nargs;
for (i = 0; i < nargs; i++)
args->args[i] = (*element)[i].integer.value;
}
(*element) += nargs;
return 0;
}
/**
* __acpi_node_get_property_reference - returns handle to the referenced object
* @fwnode: Firmware node to get the property from
@ -761,61 +813,22 @@ int __acpi_node_get_property_reference(const struct fwnode_handle *fwnode,
end = element + obj->package.count;
while (element < end) {
u32 nargs, i;
if (element->type == ACPI_TYPE_LOCAL_REFERENCE) {
struct fwnode_handle *ref_fwnode;
device = acpi_fetch_acpi_dev(element->reference.handle);
if (!device)
return -EINVAL;
nargs = 0;
element++;
/*
* Find the referred data extension node under the
* referred device node.
*/
for (ref_fwnode = acpi_fwnode_handle(device);
element < end && element->type == ACPI_TYPE_STRING;
element++) {
ref_fwnode = acpi_fwnode_get_named_child_node(
ref_fwnode, element->string.pointer);
if (!ref_fwnode)
return -EINVAL;
}
/*
* Assume the following integer elements are all args.
* Stop counting on the first reference or end of the
* package arguments. In case of neither reference,
* nor integer, return an error, we can't parse it.
*/
for (i = 0; element + i < end && i < num_args; i++) {
acpi_object_type type = element[i].type;
if (type == ACPI_TYPE_LOCAL_REFERENCE)
break;
if (type == ACPI_TYPE_INTEGER)
nargs++;
else
return -EINVAL;
}
if (nargs > NR_FWNODE_REFERENCE_ARGS)
return -EINVAL;
if (idx == index) {
args->fwnode = ref_fwnode;
args->nargs = nargs;
for (i = 0; i < nargs; i++)
args->args[i] = element[i].integer.value;
ret = acpi_get_ref_args(idx == index ? args : NULL,
acpi_fwnode_handle(device),
&element, end, num_args);
if (ret < 0)
return ret;
if (idx == index)
return 0;
}
element += nargs;
} else if (element->type == ACPI_TYPE_INTEGER) {
if (idx == index)
return -ENOENT;