From: "Rafael J. Wysocki" rafael.j.wysocki@intel.com
[ Upstream commit d06118fe9b03426484980ed4c189a8c7b99fa631 ]
Data-only subnode links following the ACPI data subnode GUID in a _DSD package are expected to point to named objects returning _DSD-equivalent packages. If a reference to such an object is used in the target field of any of those links, that object will be evaluated in place (as a named object) and its return data will be embedded in the outer _DSD package.
For this reason, it is not expected to see a subnode link with the target field containing a local reference (that would mean pointing to a device or another object that cannot be evaluated in place and therefore cannot return a _DSD-equivalent package).
Accordingly, simplify the code parsing data-only subnode links to simply print a message when it encounters a local reference in the target field of one of those links.
Moreover, since acpi_nondev_subnode_data_ok() would only have one caller after the change above, fold it into that caller.
Link: https://lore.kernel.org/linux-acpi/CAJZ5v0jVeSrDO6hrZhKgRZrH=FpGD4vNUjFD8hV9... Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Reviewed-by: Sakari Ailus sakari.ailus@linux.intel.com Tested-by: Sakari Ailus sakari.ailus@linux.intel.com Stable-dep-of: baf60d5cb8bc ("ACPI: property: Do not pass NULL handles to acpi_attach_data()") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/acpi/property.c | 51 ++++++++++++++++++----------------------- 1 file changed, 22 insertions(+), 29 deletions(-)
diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c index 83b03dce576c5..5b7c10a2824d6 100644 --- a/drivers/acpi/property.c +++ b/drivers/acpi/property.c @@ -124,32 +124,12 @@ static bool acpi_nondev_subnode_extract(union acpi_object *desc, return false; }
-static bool acpi_nondev_subnode_data_ok(acpi_handle handle, - const union acpi_object *link, - struct list_head *list, - struct fwnode_handle *parent) -{ - struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; - acpi_status status; - - status = acpi_evaluate_object_typed(handle, NULL, NULL, &buf, - ACPI_TYPE_PACKAGE); - if (ACPI_FAILURE(status)) - return false; - - if (acpi_nondev_subnode_extract(buf.pointer, handle, link, list, - parent)) - return true; - - ACPI_FREE(buf.pointer); - return false; -} - static bool acpi_nondev_subnode_ok(acpi_handle scope, const union acpi_object *link, struct list_head *list, struct fwnode_handle *parent) { + struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; acpi_handle handle; acpi_status status;
@@ -161,7 +141,17 @@ static bool acpi_nondev_subnode_ok(acpi_handle scope, if (ACPI_FAILURE(status)) return false;
- return acpi_nondev_subnode_data_ok(handle, link, list, parent); + status = acpi_evaluate_object_typed(handle, NULL, NULL, &buf, + ACPI_TYPE_PACKAGE); + if (ACPI_FAILURE(status)) + return false; + + if (acpi_nondev_subnode_extract(buf.pointer, handle, link, list, + parent)) + return true; + + ACPI_FREE(buf.pointer); + return false; }
static bool acpi_add_nondev_subnodes(acpi_handle scope, @@ -174,7 +164,6 @@ static bool acpi_add_nondev_subnodes(acpi_handle scope,
for (i = 0; i < links->package.count; i++) { union acpi_object *link, *desc; - acpi_handle handle; bool result;
link = &links->package.elements[i]; @@ -186,22 +175,26 @@ static bool acpi_add_nondev_subnodes(acpi_handle scope, if (link->package.elements[0].type != ACPI_TYPE_STRING) continue;
- /* The second one may be a string, a reference or a package. */ + /* The second one may be a string or a package. */ switch (link->package.elements[1].type) { case ACPI_TYPE_STRING: result = acpi_nondev_subnode_ok(scope, link, list, parent); break; - case ACPI_TYPE_LOCAL_REFERENCE: - handle = link->package.elements[1].reference.handle; - result = acpi_nondev_subnode_data_ok(handle, link, list, - parent); - break; case ACPI_TYPE_PACKAGE: desc = &link->package.elements[1]; result = acpi_nondev_subnode_extract(desc, NULL, link, list, parent); break; + case ACPI_TYPE_LOCAL_REFERENCE: + /* + * It is not expected to see any local references in + * the links package because referencing a named object + * should cause it to be evaluated in place. + */ + acpi_handle_info(scope, "subnode %s: Unexpected reference\n", + link->package.elements[0].string.pointer); + fallthrough; default: result = false; break;