diff options
Diffstat (limited to 'drivers/of/overlay.c')
| -rw-r--r-- | drivers/of/overlay.c | 32 |
1 files changed, 29 insertions, 3 deletions
diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c index 9808aae4621a..e6d4138b02a3 100644 --- a/drivers/of/overlay.c +++ b/drivers/of/overlay.c @@ -287,7 +287,12 @@ err_free_target_path: * @target may be either in the live devicetree or in a new subtree that * is contained in the changeset. * - * Some special properties are not updated (no error returned). + * Some special properties are not added or updated (no error returned): + * "name", "phandle", "linux,phandle". + * + * Properties "#address-cells" and "#size-cells" are not updated if they + * are already in the live tree, but if present in the live tree, the values + * in the overlay must match the values in the live tree. * * Update of property in symbols node is not allowed. * @@ -300,6 +305,7 @@ static int add_changeset_property(struct overlay_changeset *ovcs, { struct property *new_prop = NULL, *prop; int ret = 0; + bool check_for_non_overlay_node = false; if (!of_prop_cmp(overlay_prop->name, "name") || !of_prop_cmp(overlay_prop->name, "phandle") || @@ -322,12 +328,32 @@ static int add_changeset_property(struct overlay_changeset *ovcs, if (!new_prop) return -ENOMEM; - if (!prop) + if (!prop) { + check_for_non_overlay_node = true; ret = of_changeset_add_property(&ovcs->cset, target->np, new_prop); - else + } else if (!of_prop_cmp(prop->name, "#address-cells")) { + if (!of_prop_val_eq(prop, new_prop)) { + pr_err("ERROR: changing value of #address-cells is not allowed in %pOF\n", + target->np); + ret = -EINVAL; + } + } else if (!of_prop_cmp(prop->name, "#size-cells")) { + if (!of_prop_val_eq(prop, new_prop)) { + pr_err("ERROR: changing value of #size-cells is not allowed in %pOF\n", + target->np); + ret = -EINVAL; + } + } else { + check_for_non_overlay_node = true; ret = of_changeset_update_property(&ovcs->cset, target->np, new_prop); + } + + if (check_for_non_overlay_node && + !of_node_check_flag(target->np, OF_OVERLAY)) + pr_err("WARNING: memory leak will occur if overlay removed, property: %pOF/%s\n", + target->np, new_prop->name); if (ret) { kfree(new_prop->name); |