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path: root/drivers/acpi/resources
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-rw-r--r--drivers/acpi/resources/rsutils.c95
-rw-r--r--drivers/acpi/resources/rsxface.c368
2 files changed, 261 insertions, 202 deletions
diff --git a/drivers/acpi/resources/rsutils.c b/drivers/acpi/resources/rsutils.c
index 0e493f2fec4d..a9cbee8e8b44 100644
--- a/drivers/acpi/resources/rsutils.c
+++ b/drivers/acpi/resources/rsutils.c
@@ -442,7 +442,7 @@ acpi_rs_set_resource_source(union aml_resource * aml,
*
* FUNCTION: acpi_rs_get_prt_method_data
*
- * PARAMETERS: Handle - Handle to the containing object
+ * PARAMETERS: Node - Device node
* ret_buffer - Pointer to a buffer structure for the
* results
*
@@ -457,7 +457,8 @@ acpi_rs_set_resource_source(union aml_resource * aml,
******************************************************************************/
acpi_status
-acpi_rs_get_prt_method_data(acpi_handle handle, struct acpi_buffer * ret_buffer)
+acpi_rs_get_prt_method_data(struct acpi_namespace_node * node,
+ struct acpi_buffer * ret_buffer)
{
union acpi_operand_object *obj_desc;
acpi_status status;
@@ -468,7 +469,7 @@ acpi_rs_get_prt_method_data(acpi_handle handle, struct acpi_buffer * ret_buffer)
/* Execute the method, no parameters */
- status = acpi_ut_evaluate_object(handle, METHOD_NAME__PRT,
+ status = acpi_ut_evaluate_object(node, METHOD_NAME__PRT,
ACPI_BTYPE_PACKAGE, &obj_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
@@ -490,7 +491,7 @@ acpi_rs_get_prt_method_data(acpi_handle handle, struct acpi_buffer * ret_buffer)
*
* FUNCTION: acpi_rs_get_crs_method_data
*
- * PARAMETERS: Handle - Handle to the containing object
+ * PARAMETERS: Node - Device node
* ret_buffer - Pointer to a buffer structure for the
* results
*
@@ -505,7 +506,8 @@ acpi_rs_get_prt_method_data(acpi_handle handle, struct acpi_buffer * ret_buffer)
******************************************************************************/
acpi_status
-acpi_rs_get_crs_method_data(acpi_handle handle, struct acpi_buffer *ret_buffer)
+acpi_rs_get_crs_method_data(struct acpi_namespace_node *node,
+ struct acpi_buffer *ret_buffer)
{
union acpi_operand_object *obj_desc;
acpi_status status;
@@ -516,7 +518,7 @@ acpi_rs_get_crs_method_data(acpi_handle handle, struct acpi_buffer *ret_buffer)
/* Execute the method, no parameters */
- status = acpi_ut_evaluate_object(handle, METHOD_NAME__CRS,
+ status = acpi_ut_evaluate_object(node, METHOD_NAME__CRS,
ACPI_BTYPE_BUFFER, &obj_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
@@ -539,7 +541,7 @@ acpi_rs_get_crs_method_data(acpi_handle handle, struct acpi_buffer *ret_buffer)
*
* FUNCTION: acpi_rs_get_prs_method_data
*
- * PARAMETERS: Handle - Handle to the containing object
+ * PARAMETERS: Node - Device node
* ret_buffer - Pointer to a buffer structure for the
* results
*
@@ -555,7 +557,8 @@ acpi_rs_get_crs_method_data(acpi_handle handle, struct acpi_buffer *ret_buffer)
#ifdef ACPI_FUTURE_USAGE
acpi_status
-acpi_rs_get_prs_method_data(acpi_handle handle, struct acpi_buffer *ret_buffer)
+acpi_rs_get_prs_method_data(struct acpi_namespace_node *node,
+ struct acpi_buffer *ret_buffer)
{
union acpi_operand_object *obj_desc;
acpi_status status;
@@ -566,7 +569,7 @@ acpi_rs_get_prs_method_data(acpi_handle handle, struct acpi_buffer *ret_buffer)
/* Execute the method, no parameters */
- status = acpi_ut_evaluate_object(handle, METHOD_NAME__PRS,
+ status = acpi_ut_evaluate_object(node, METHOD_NAME__PRS,
ACPI_BTYPE_BUFFER, &obj_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
@@ -641,7 +644,7 @@ acpi_rs_get_method_data(acpi_handle handle,
*
* FUNCTION: acpi_rs_set_srs_method_data
*
- * PARAMETERS: Handle - Handle to the containing object
+ * PARAMETERS: Node - Device node
* in_buffer - Pointer to a buffer structure of the
* parameter
*
@@ -653,23 +656,37 @@ acpi_rs_get_method_data(acpi_handle handle,
* If the function fails an appropriate status will be returned
* and the contents of the callers buffer is undefined.
*
+ * Note: Parameters guaranteed valid by caller
+ *
******************************************************************************/
acpi_status
-acpi_rs_set_srs_method_data(acpi_handle handle, struct acpi_buffer *in_buffer)
+acpi_rs_set_srs_method_data(struct acpi_namespace_node *node,
+ struct acpi_buffer *in_buffer)
{
- struct acpi_parameter_info info;
- union acpi_operand_object *params[2];
+ struct acpi_evaluate_info *info;
+ union acpi_operand_object *args[2];
acpi_status status;
struct acpi_buffer buffer;
ACPI_FUNCTION_TRACE(rs_set_srs_method_data);
- /* Parameters guaranteed valid by caller */
+ /* Allocate and initialize the evaluation information block */
+
+ info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
+ if (!info) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ info->prefix_node = node;
+ info->pathname = METHOD_NAME__SRS;
+ info->parameters = args;
+ info->parameter_type = ACPI_PARAM_ARGS;
+ info->flags = ACPI_IGNORE_RETURN_VALUE;
/*
* The in_buffer parameter will point to a linked list of
- * resource parameters. It needs to be formatted into a
+ * resource parameters. It needs to be formatted into a
* byte stream to be sent in as an input parameter to _SRS
*
* Convert the linked list into a byte stream
@@ -677,42 +694,36 @@ acpi_rs_set_srs_method_data(acpi_handle handle, struct acpi_buffer *in_buffer)
buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
status = acpi_rs_create_aml_resources(in_buffer->pointer, &buffer);
if (ACPI_FAILURE(status)) {
- return_ACPI_STATUS(status);
+ goto cleanup;
}
- /* Init the param object */
+ /* Create and initialize the method parameter object */
- params[0] = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
- if (!params[0]) {
- acpi_os_free(buffer.pointer);
- return_ACPI_STATUS(AE_NO_MEMORY);
+ args[0] = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
+ if (!args[0]) {
+ /*
+ * Must free the buffer allocated above (otherwise it is freed
+ * later)
+ */
+ ACPI_FREE(buffer.pointer);
+ status = AE_NO_MEMORY;
+ goto cleanup;
}
- /* Set up the parameter object */
-
- params[0]->buffer.length = (u32) buffer.length;
- params[0]->buffer.pointer = buffer.pointer;
- params[0]->common.flags = AOPOBJ_DATA_VALID;
- params[1] = NULL;
+ args[0]->buffer.length = (u32) buffer.length;
+ args[0]->buffer.pointer = buffer.pointer;
+ args[0]->common.flags = AOPOBJ_DATA_VALID;
+ args[1] = NULL;
- info.node = handle;
- info.parameters = params;
- info.parameter_type = ACPI_PARAM_ARGS;
+ /* Execute the method, no return value is expected */
- /* Execute the method, no return value */
+ status = acpi_ns_evaluate(info);
- status = acpi_ns_evaluate_relative(METHOD_NAME__SRS, &info);
- if (ACPI_SUCCESS(status)) {
-
- /* Delete any return object (especially if implicit_return is enabled) */
-
- if (info.return_object) {
- acpi_ut_remove_reference(info.return_object);
- }
- }
+ /* Clean up and return the status from acpi_ns_evaluate */
- /* Clean up and return the status from acpi_ns_evaluate_relative */
+ acpi_ut_remove_reference(args[0]);
- acpi_ut_remove_reference(params[0]);
+ cleanup:
+ ACPI_FREE(info);
return_ACPI_STATUS(status);
}
diff --git a/drivers/acpi/resources/rsxface.c b/drivers/acpi/resources/rsxface.c
index 8c1628c12cc8..1999e2ab7daa 100644
--- a/drivers/acpi/resources/rsxface.c
+++ b/drivers/acpi/resources/rsxface.c
@@ -43,6 +43,7 @@
#include <acpi/acpi.h>
#include <acpi/acresrc.h>
+#include <acpi/acnamesp.h>
#define _COMPONENT ACPI_RESOURCES
ACPI_MODULE_NAME("rsxface")
@@ -66,19 +67,80 @@ ACPI_MODULE_NAME("rsxface")
static acpi_status
acpi_rs_match_vendor_resource(struct acpi_resource *resource, void *context);
+static acpi_status
+acpi_rs_validate_parameters(acpi_handle device_handle,
+ struct acpi_buffer *buffer,
+ struct acpi_namespace_node **return_node);
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_rs_validate_parameters
+ *
+ * PARAMETERS: device_handle - Handle to a device
+ * Buffer - Pointer to a data buffer
+ * return_node - Pointer to where the device node is returned
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Common parameter validation for resource interfaces
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_rs_validate_parameters(acpi_handle device_handle,
+ struct acpi_buffer *buffer,
+ struct acpi_namespace_node **return_node)
+{
+ acpi_status status;
+ struct acpi_namespace_node *node;
+
+ ACPI_FUNCTION_TRACE(rs_validate_parameters);
+
+ /*
+ * Must have a valid handle to an ACPI device
+ */
+ if (!device_handle) {
+ return_ACPI_STATUS(AE_BAD_PARAMETER);
+ }
+
+ node = acpi_ns_map_handle_to_node(device_handle);
+ if (!node) {
+ return_ACPI_STATUS(AE_BAD_PARAMETER);
+ }
+
+ if (node->type != ACPI_TYPE_DEVICE) {
+ return_ACPI_STATUS(AE_TYPE);
+ }
+
+ /*
+ * Validate the user buffer object
+ *
+ * if there is a non-zero buffer length we also need a valid pointer in
+ * the buffer. If it's a zero buffer length, we'll be returning the
+ * needed buffer size (later), so keep going.
+ */
+ status = acpi_ut_validate_buffer(buffer);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ *return_node = node;
+ return_ACPI_STATUS(AE_OK);
+}
+
/*******************************************************************************
*
* FUNCTION: acpi_get_irq_routing_table
*
- * PARAMETERS: device_handle - a handle to the Bus device we are querying
- * ret_buffer - a pointer to a buffer to receive the
+ * PARAMETERS: device_handle - Handle to the Bus device we are querying
+ * ret_buffer - Pointer to a buffer to receive the
* current resources for the device
*
* RETURN: Status
*
* DESCRIPTION: This function is called to get the IRQ routing table for a
- * specific bus. The caller must first acquire a handle for the
- * desired bus. The routine table is placed in the buffer pointed
+ * specific bus. The caller must first acquire a handle for the
+ * desired bus. The routine table is placed in the buffer pointed
* to by the ret_buffer variable parameter.
*
* If the function fails an appropriate status will be returned
@@ -94,25 +156,18 @@ acpi_get_irq_routing_table(acpi_handle device_handle,
struct acpi_buffer *ret_buffer)
{
acpi_status status;
+ struct acpi_namespace_node *node;
ACPI_FUNCTION_TRACE(acpi_get_irq_routing_table);
- /*
- * Must have a valid handle and buffer, So we have to have a handle
- * and a return buffer structure, and if there is a non-zero buffer length
- * we also need a valid pointer in the buffer. If it's a zero buffer length,
- * we'll be returning the needed buffer size, so keep going.
- */
- if (!device_handle) {
- return_ACPI_STATUS(AE_BAD_PARAMETER);
- }
+ /* Validate parameters then dispatch to internal routine */
- status = acpi_ut_validate_buffer(ret_buffer);
+ status = acpi_rs_validate_parameters(device_handle, ret_buffer, &node);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
- status = acpi_rs_get_prt_method_data(device_handle, ret_buffer);
+ status = acpi_rs_get_prt_method_data(node, ret_buffer);
return_ACPI_STATUS(status);
}
@@ -122,16 +177,16 @@ ACPI_EXPORT_SYMBOL(acpi_get_irq_routing_table)
*
* FUNCTION: acpi_get_current_resources
*
- * PARAMETERS: device_handle - a handle to the device object for the
+ * PARAMETERS: device_handle - Handle to the device object for the
* device we are querying
- * ret_buffer - a pointer to a buffer to receive the
+ * ret_buffer - Pointer to a buffer to receive the
* current resources for the device
*
* RETURN: Status
*
* DESCRIPTION: This function is called to get the current resources for a
- * specific device. The caller must first acquire a handle for
- * the desired device. The resource data is placed in the buffer
+ * specific device. The caller must first acquire a handle for
+ * the desired device. The resource data is placed in the buffer
* pointed to by the ret_buffer variable parameter.
*
* If the function fails an appropriate status will be returned
@@ -146,25 +201,18 @@ acpi_get_current_resources(acpi_handle device_handle,
struct acpi_buffer *ret_buffer)
{
acpi_status status;
+ struct acpi_namespace_node *node;
ACPI_FUNCTION_TRACE(acpi_get_current_resources);
- /*
- * Must have a valid handle and buffer, So we have to have a handle
- * and a return buffer structure, and if there is a non-zero buffer length
- * we also need a valid pointer in the buffer. If it's a zero buffer length,
- * we'll be returning the needed buffer size, so keep going.
- */
- if (!device_handle) {
- return_ACPI_STATUS(AE_BAD_PARAMETER);
- }
+ /* Validate parameters then dispatch to internal routine */
- status = acpi_ut_validate_buffer(ret_buffer);
+ status = acpi_rs_validate_parameters(device_handle, ret_buffer, &node);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
- status = acpi_rs_get_crs_method_data(device_handle, ret_buffer);
+ status = acpi_rs_get_crs_method_data(node, ret_buffer);
return_ACPI_STATUS(status);
}
@@ -175,16 +223,16 @@ ACPI_EXPORT_SYMBOL(acpi_get_current_resources)
*
* FUNCTION: acpi_get_possible_resources
*
- * PARAMETERS: device_handle - a handle to the device object for the
+ * PARAMETERS: device_handle - Handle to the device object for the
* device we are querying
- * ret_buffer - a pointer to a buffer to receive the
+ * ret_buffer - Pointer to a buffer to receive the
* resources for the device
*
* RETURN: Status
*
* DESCRIPTION: This function is called to get a list of the possible resources
- * for a specific device. The caller must first acquire a handle
- * for the desired device. The resource data is placed in the
+ * for a specific device. The caller must first acquire a handle
+ * for the desired device. The resource data is placed in the
* buffer pointed to by the ret_buffer variable.
*
* If the function fails an appropriate status will be returned
@@ -196,25 +244,18 @@ acpi_get_possible_resources(acpi_handle device_handle,
struct acpi_buffer *ret_buffer)
{
acpi_status status;
+ struct acpi_namespace_node *node;
ACPI_FUNCTION_TRACE(acpi_get_possible_resources);
- /*
- * Must have a valid handle and buffer, So we have to have a handle
- * and a return buffer structure, and if there is a non-zero buffer length
- * we also need a valid pointer in the buffer. If it's a zero buffer length,
- * we'll be returning the needed buffer size, so keep going.
- */
- if (!device_handle) {
- return_ACPI_STATUS(AE_BAD_PARAMETER);
- }
+ /* Validate parameters then dispatch to internal routine */
- status = acpi_ut_validate_buffer(ret_buffer);
+ status = acpi_rs_validate_parameters(device_handle, ret_buffer, &node);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
- status = acpi_rs_get_prs_method_data(device_handle, ret_buffer);
+ status = acpi_rs_get_prs_method_data(node, ret_buffer);
return_ACPI_STATUS(status);
}
@@ -223,113 +264,18 @@ ACPI_EXPORT_SYMBOL(acpi_get_possible_resources)
/*******************************************************************************
*
- * FUNCTION: acpi_walk_resources
- *
- * PARAMETERS: device_handle - Handle to the device object for the
- * device we are querying
- * Name - Method name of the resources we want
- * (METHOD_NAME__CRS or METHOD_NAME__PRS)
- * user_function - Called for each resource
- * Context - Passed to user_function
- *
- * RETURN: Status
- *
- * DESCRIPTION: Retrieves the current or possible resource list for the
- * specified device. The user_function is called once for
- * each resource in the list.
- *
- ******************************************************************************/
-acpi_status
-acpi_walk_resources(acpi_handle device_handle,
- char *name,
- acpi_walk_resource_callback user_function, void *context)
-{
- acpi_status status;
- struct acpi_buffer buffer;
- struct acpi_resource *resource;
- struct acpi_resource *resource_end;
-
- ACPI_FUNCTION_TRACE(acpi_walk_resources);
-
- /* Parameter validation */
-
- if (!device_handle || !user_function || !name ||
- (!ACPI_COMPARE_NAME(name, METHOD_NAME__CRS) &&
- !ACPI_COMPARE_NAME(name, METHOD_NAME__PRS))) {
- return_ACPI_STATUS(AE_BAD_PARAMETER);
- }
-
- /* Get the _CRS or _PRS resource list */
-
- buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
- status = acpi_rs_get_method_data(device_handle, name, &buffer);
- if (ACPI_FAILURE(status)) {
- return_ACPI_STATUS(status);
- }
-
- /* Buffer now contains the resource list */
-
- resource = ACPI_CAST_PTR(struct acpi_resource, buffer.pointer);
- resource_end =
- ACPI_ADD_PTR(struct acpi_resource, buffer.pointer, buffer.length);
-
- /* Walk the resource list until the end_tag is found (or buffer end) */
-
- while (resource < resource_end) {
-
- /* Sanity check the resource */
-
- if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
- status = AE_AML_INVALID_RESOURCE_TYPE;
- break;
- }
-
- /* Invoke the user function, abort on any error returned */
-
- status = user_function(resource, context);
- if (ACPI_FAILURE(status)) {
- if (status == AE_CTRL_TERMINATE) {
-
- /* This is an OK termination by the user function */
-
- status = AE_OK;
- }
- break;
- }
-
- /* end_tag indicates end-of-list */
-
- if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
- break;
- }
-
- /* Get the next resource descriptor */
-
- resource =
- ACPI_ADD_PTR(struct acpi_resource, resource,
- resource->length);
- }
-
- ACPI_FREE(buffer.pointer);
- return_ACPI_STATUS(status);
-}
-
-ACPI_EXPORT_SYMBOL(acpi_walk_resources)
-
-/*******************************************************************************
- *
* FUNCTION: acpi_set_current_resources
*
- * PARAMETERS: device_handle - a handle to the device object for the
- * device we are changing the resources of
- * in_buffer - a pointer to a buffer containing the
+ * PARAMETERS: device_handle - Handle to the device object for the
+ * device we are setting resources
+ * in_buffer - Pointer to a buffer containing the
* resources to be set for the device
*
* RETURN: Status
*
* DESCRIPTION: This function is called to set the current resources for a
- * specific device. The caller must first acquire a handle for
- * the desired device. The resource data is passed to the routine
+ * specific device. The caller must first acquire a handle for
+ * the desired device. The resource data is passed to the routine
* the buffer pointed to by the in_buffer variable.
*
******************************************************************************/
@@ -338,17 +284,24 @@ acpi_set_current_resources(acpi_handle device_handle,
struct acpi_buffer *in_buffer)
{
acpi_status status;
+ struct acpi_namespace_node *node;
ACPI_FUNCTION_TRACE(acpi_set_current_resources);
- /* Must have a valid handle and buffer */
+ /* Validate the buffer, don't allow zero length */
- if ((!device_handle) ||
- (!in_buffer) || (!in_buffer->pointer) || (!in_buffer->length)) {
+ if ((!in_buffer) || (!in_buffer->pointer) || (!in_buffer->length)) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
- status = acpi_rs_set_srs_method_data(device_handle, in_buffer);
+ /* Validate parameters then dispatch to internal routine */
+
+ status = acpi_rs_validate_parameters(device_handle, in_buffer, &node);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ status = acpi_rs_set_srs_method_data(node, in_buffer);
return_ACPI_STATUS(status);
}
@@ -358,15 +311,14 @@ ACPI_EXPORT_SYMBOL(acpi_set_current_resources)
*
* FUNCTION: acpi_resource_to_address64
*
- * PARAMETERS: Resource - Pointer to a resource
- * Out - Pointer to the users's return
- * buffer (a struct
- * struct acpi_resource_address64)
+ * PARAMETERS: Resource - Pointer to a resource
+ * Out - Pointer to the users's return buffer
+ * (a struct acpi_resource_address64)
*
* RETURN: Status
*
* DESCRIPTION: If the resource is an address16, address32, or address64,
- * copy it to the address64 return buffer. This saves the
+ * copy it to the address64 return buffer. This saves the
* caller from having to duplicate code for different-sized
* addresses.
*
@@ -418,12 +370,12 @@ ACPI_EXPORT_SYMBOL(acpi_resource_to_address64)
*
* FUNCTION: acpi_get_vendor_resource
*
- * PARAMETERS: device_handle - Handle for the parent device object
- * Name - Method name for the parent resource
- * (METHOD_NAME__CRS or METHOD_NAME__PRS)
- * Uuid - Pointer to the UUID to be matched.
- * includes both subtype and 16-byte UUID
- * ret_buffer - Where the vendor resource is returned
+ * PARAMETERS: device_handle - Handle for the parent device object
+ * Name - Method name for the parent resource
+ * (METHOD_NAME__CRS or METHOD_NAME__PRS)
+ * Uuid - Pointer to the UUID to be matched.
+ * includes both subtype and 16-byte UUID
+ * ret_buffer - Where the vendor resource is returned
*
* RETURN: Status
*
@@ -525,3 +477,99 @@ acpi_rs_match_vendor_resource(struct acpi_resource *resource, void *context)
}
ACPI_EXPORT_SYMBOL(acpi_rs_match_vendor_resource)
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_walk_resources
+ *
+ * PARAMETERS: device_handle - Handle to the device object for the
+ * device we are querying
+ * Name - Method name of the resources we want
+ * (METHOD_NAME__CRS or METHOD_NAME__PRS)
+ * user_function - Called for each resource
+ * Context - Passed to user_function
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Retrieves the current or possible resource list for the
+ * specified device. The user_function is called once for
+ * each resource in the list.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_walk_resources(acpi_handle device_handle,
+ char *name,
+ acpi_walk_resource_callback user_function, void *context)
+{
+ acpi_status status;
+ struct acpi_buffer buffer;
+ struct acpi_resource *resource;
+ struct acpi_resource *resource_end;
+
+ ACPI_FUNCTION_TRACE(acpi_walk_resources);
+
+ /* Parameter validation */
+
+ if (!device_handle || !user_function || !name ||
+ (!ACPI_COMPARE_NAME(name, METHOD_NAME__CRS) &&
+ !ACPI_COMPARE_NAME(name, METHOD_NAME__PRS))) {
+ return_ACPI_STATUS(AE_BAD_PARAMETER);
+ }
+
+ /* Get the _CRS or _PRS resource list */
+
+ buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
+ status = acpi_rs_get_method_data(device_handle, name, &buffer);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ /* Buffer now contains the resource list */
+
+ resource = ACPI_CAST_PTR(struct acpi_resource, buffer.pointer);
+ resource_end =
+ ACPI_ADD_PTR(struct acpi_resource, buffer.pointer, buffer.length);
+
+ /* Walk the resource list until the end_tag is found (or buffer end) */
+
+ while (resource < resource_end) {
+
+ /* Sanity check the resource */
+
+ if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
+ status = AE_AML_INVALID_RESOURCE_TYPE;
+ break;
+ }
+
+ /* Invoke the user function, abort on any error returned */
+
+ status = user_function(resource, context);
+ if (ACPI_FAILURE(status)) {
+ if (status == AE_CTRL_TERMINATE) {
+
+ /* This is an OK termination by the user function */
+
+ status = AE_OK;
+ }
+ break;
+ }
+
+ /* end_tag indicates end-of-list */
+
+ if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
+ break;
+ }
+
+ /* Get the next resource descriptor */
+
+ resource =
+ ACPI_ADD_PTR(struct acpi_resource, resource,
+ resource->length);
+ }
+
+ ACPI_FREE(buffer.pointer);
+ return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_walk_resources)