From: Frank Rowand frank.rowand@sony.com
The "%pOF" printf format was recently added to print the full name of a device tree node, with the intent of changing the node full_name field to contain only the node name instead of the full path of the node.
dup_and_fixup_symbol_prop() duplicates a property from the "/__symbols__" node of an overlay device tree. The value of each duplicated property must be fixed up to include the full path of a node in the live device tree. The current code uses the node's full_name for that purpose. Update the code to use the "%pOF" printf format to determine the node's full path.
Signed-off-by: Frank Rowand frank.rowand@sony.com --- drivers/of/base.c | 2 +- drivers/of/of_private.h | 2 ++ drivers/of/overlay.c | 90 ++++++++++++++++++++++++++++++------------------- 3 files changed, 59 insertions(+), 35 deletions(-)
diff --git a/drivers/of/base.c b/drivers/of/base.c index 260d33c0f26c..6f91fa67e5bb 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -760,7 +760,7 @@ struct device_node *of_get_child_by_name(const struct device_node *node, } EXPORT_SYMBOL(of_get_child_by_name);
-static struct device_node *__of_find_node_by_path(struct device_node *parent, +struct device_node *__of_find_node_by_path(struct device_node *parent, const char *path) { struct device_node *child; diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h index b66e8a812147..0c9e473801f2 100644 --- a/drivers/of/of_private.h +++ b/drivers/of/of_private.h @@ -81,6 +81,8 @@ extern void *__unflatten_device_tree(const void *blob, struct property *__of_prop_dup(const struct property *prop, gfp_t allocflags); __printf(2, 3) struct device_node *__of_node_dup(const struct device_node *np, const char *fmt, ...);
+struct device_node *__of_find_node_by_path(struct device_node *parent, + const char *path); struct device_node *__of_find_node_by_full_path(struct device_node *node, const char *path);
diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c index 172807d3f375..81881e45f273 100644 --- a/drivers/of/overlay.c +++ b/drivers/of/overlay.c @@ -37,6 +37,7 @@ struct fragment { /** * struct overlay_changeset * @ovcs_list: list on which we are located + * @overlay_tree: expanded device tree that contains the fragment nodes * @count: count of fragment structures * @fragments: fragment nodes in the overlay expanded device tree * @symbols_fragment: last element of @fragments[] is the __symbols__ node @@ -45,6 +46,7 @@ struct fragment { struct overlay_changeset { int id; struct list_head ovcs_list; + struct device_node *overlay_tree; int count; struct fragment *fragments; bool symbols_fragment; @@ -145,12 +147,13 @@ static int overlay_notify(struct overlay_changeset *ovcs, }
/* - * The properties in the "/__symbols__" node are "symbols". + * The values of properties in the "/__symbols__" node are paths in + * the ovcs->overlay_tree. When duplicating the properties, the paths + * need to be adjusted to be the correct path for the live device tree. * - * The value of properties in the "/__symbols__" node is the path of a - * node in the subtree of a fragment node's "__overlay__" node, for - * example "/fragment@0/__overlay__/symbol_path_tail". Symbol_path_tail - * can be a single node or it may be a multi-node path. + * The paths refer to a node in the subtree of a fragment node's "__overlay__" + * node, for example "/fragment@0/__overlay__/symbol_path_tail", + * where symbol_path_tail can be a single node or it may be a multi-node path. * * The duplicated property value will be modified by replacing the * "/fragment_name/__overlay/" portion of the value with the target @@ -160,59 +163,76 @@ static struct property *dup_and_fixup_symbol_prop( struct overlay_changeset *ovcs, const struct property *prop) { struct fragment *fragment; - struct property *new; - const char *overlay_name; - char *symbol_path_tail; - char *symbol_path; + struct property *new_prop; + struct device_node *fragment_node; + struct device_node *overlay_node; + const char *path; + const char *path_tail; const char *target_path; int k; - int symbol_path_tail_len; int overlay_name_len; + int path_len; + int path_tail_len; int target_path_len;
if (!prop->value) return NULL; - symbol_path = prop->value; + if (strnlen(prop->value, prop->length) >= prop->length) + return NULL; + path = prop->value; + path_len = strlen(path);
- new = kzalloc(sizeof(*new), GFP_KERNEL); - if (!new) + if (path_len < 1) return NULL; + fragment_node = __of_find_node_by_path(ovcs->overlay_tree, path + 1); + overlay_node = __of_find_node_by_path(fragment_node, "__overlay__/"); + of_node_put(fragment_node); + of_node_put(overlay_node);
for (k = 0; k < ovcs->count; k++) { fragment = &ovcs->fragments[k]; - overlay_name = fragment->overlay->full_name; - overlay_name_len = strlen(overlay_name); - if (!strncasecmp(symbol_path, overlay_name, overlay_name_len)) + if (fragment->overlay == overlay_node) break; } - if (k >= ovcs->count) - goto err_free; + return NULL; + + overlay_name_len = snprintf(NULL, 0, "%pOF", fragment->overlay);
- target_path = fragment->target->full_name; + if (overlay_name_len > path_len) + return NULL; + path_tail = path + overlay_name_len; + path_tail_len = strlen(path_tail); + + target_path = kasprintf(GFP_KERNEL, "%pOF", fragment->target); + if (!target_path) + return NULL; target_path_len = strlen(target_path);
- symbol_path_tail = symbol_path + overlay_name_len; - symbol_path_tail_len = strlen(symbol_path_tail); + new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL); + if (!new_prop) + goto err_free_target_path;
- new->name = kstrdup(prop->name, GFP_KERNEL); - new->length = target_path_len + symbol_path_tail_len + 1; - new->value = kzalloc(new->length, GFP_KERNEL); + new_prop->name = kstrdup(prop->name, GFP_KERNEL); + new_prop->length = target_path_len + path_tail_len + 1; + new_prop->value = kzalloc(new_prop->length, GFP_KERNEL); + if (!new_prop->name || !new_prop->value) + goto err_free_new_prop;
- if (!new->name || !new->value) - goto err_free; + strcpy(new_prop->value, target_path); + strcpy(new_prop->value + target_path_len, path_tail);
- strcpy(new->value, target_path); - strcpy(new->value + target_path_len, symbol_path_tail); + of_property_set_flag(new_prop, OF_DYNAMIC);
- of_property_set_flag(new, OF_DYNAMIC); + return new_prop;
- return new; +err_free_new_prop: + kfree(new_prop->name); + kfree(new_prop->value); + kfree(new_prop); +err_free_target_path: + kfree(target_path);
- err_free: - kfree(new->name); - kfree(new->value); - kfree(new); return NULL; }
@@ -510,6 +530,8 @@ static int init_overlay_changeset(struct overlay_changeset *ovcs, if (!of_node_is_root(tree)) pr_debug("%s() tree is not root\n", __func__);
+ ovcs->overlay_tree = tree; + INIT_LIST_HEAD(&ovcs->ovcs_list);
of_changeset_init(&ovcs->cset);