When the iort_match_node_callback is invoked for a named component the match should be executed upon a device with an ACPI companion.
For devices with no ACPI companion set-up the ACPI device tree must be walked in order to find the first parent node with a companion set and check the parent node against the named component entry to check whether there is a match and therefore an IORT node describing the in/out ID translation for the device has been found. Signed-off-by: Lorenzo Pieralisi <[email protected]> Cc: Will Deacon <[email protected]> Cc: Hanjun Guo <[email protected]> Cc: Sudeep Holla <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: Robin Murphy <[email protected]> Cc: "Rafael J. Wysocki" <[email protected]> --- drivers/acpi/arm64/iort.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 7d04424189df..7cfd77b5e6e8 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -264,15 +264,31 @@ static acpi_status iort_match_node_callback(struct acpi_iort_node *node, if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT) { struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL }; - struct acpi_device *adev = to_acpi_device_node(dev->fwnode); + struct acpi_device *adev; struct acpi_iort_named_component *ncomp; + struct device *nc_dev = dev; + + /* + * Walk the device tree to find a device with an + * ACPI companion; there is no point in scanning + * IORT for a device matching a named component if + * the device does not have an ACPI companion to + * start with. + */ + do { + adev = ACPI_COMPANION(nc_dev); + if (adev) + break; + + nc_dev = nc_dev->parent; + } while (nc_dev); if (!adev) goto out; status = acpi_get_name(adev->handle, ACPI_FULL_PATHNAME, &buf); if (ACPI_FAILURE(status)) { - dev_warn(dev, "Can't get device full path name\n"); + dev_warn(nc_dev, "Can't get device full path name\n"); goto out; } -- 2.26.1 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
