6.6-stable review patch. If anyone has any objections, please let me know.
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From: Rafael J. Wysocki rafael.j.wysocki@intel.com
commit d0759b10989c5c5aae3d455458c9fc4e8cc694f7 upstream.
The ACPI handle passed to acpi_extract_properties() as the first argument represents the ACPI namespace scope in which to look for objects returning buffers associated with buffer properties.
For _DSD objects located immediately under ACPI devices, this handle is the same as the handle of the device object holding the _DSD, but for data-only subnodes it is not so.
First of all, data-only subnodes are represented by objects that cannot hold other objects in their scopes (like control methods). Therefore a data-only subnode handle cannot be used for completing relative pathname segments, so the current code in in acpi_nondev_subnode_extract() passing a data-only subnode handle to acpi_extract_properties() is invalid.
Moreover, a data-only subnode of device A may be represented by an object located in the scope of device B (which kind of makes sense, for instance, if A is a B's child). In that case, the scope in question would be the one of device B. In other words, the scope mentioned above is the same as the scope used for subnode object lookup in acpi_nondev_subnode_extract().
Accordingly, rearrange that function to use the same scope for the extraction of properties and subnode object lookup.
Fixes: 103e10c69c61 ("ACPI: property: Add support for parsing buffer property UUID") Cc: 6.0+ stable@vger.kernel.org # 6.0+ 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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/acpi/property.c | 30 +++++++++++------------------- 1 file changed, 11 insertions(+), 19 deletions(-)
--- a/drivers/acpi/property.c +++ b/drivers/acpi/property.c @@ -74,6 +74,7 @@ static bool acpi_nondev_subnode_extract( struct fwnode_handle *parent) { struct acpi_data_node *dn; + acpi_handle scope = NULL; bool result;
dn = kzalloc(sizeof(*dn), GFP_KERNEL); @@ -86,27 +87,18 @@ static bool acpi_nondev_subnode_extract( INIT_LIST_HEAD(&dn->data.properties); INIT_LIST_HEAD(&dn->data.subnodes);
- result = acpi_extract_properties(handle, desc, &dn->data); + /* + * The scope for the completion of relative pathname segments and + * subnode object lookup is the one of the namespace node (device) + * containing the object that has returned the package. That is, it's + * the scope of that object's parent device. + */ + if (handle) + acpi_get_parent(handle, &scope);
- if (handle) { - acpi_handle scope; - acpi_status status; - - /* - * The scope for the subnode object lookup is the one of the - * namespace node (device) containing the object that has - * returned the package. That is, it's the scope of that - * object's parent. - */ - status = acpi_get_parent(handle, &scope); - if (ACPI_SUCCESS(status) - && acpi_enumerate_nondev_subnodes(scope, desc, &dn->data, - &dn->fwnode)) - result = true; - } else if (acpi_enumerate_nondev_subnodes(NULL, desc, &dn->data, - &dn->fwnode)) { + result = acpi_extract_properties(scope, desc, &dn->data); + if (acpi_enumerate_nondev_subnodes(scope, desc, &dn->data, &dn->fwnode)) result = true; - }
if (result) { dn->handle = handle;