Commit e0a58f3e authored by Frank Rowand's avatar Frank Rowand Committed by Rob Herring

of: overlay: remove a dependency on device node full_name

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: default avatarFrank Rowand <frank.rowand@sony.com>
Signed-off-by: default avatarRob Herring <robh@kernel.org>
parent 3912b791
...@@ -658,7 +658,7 @@ struct device_node *of_get_child_by_name(const struct device_node *node, ...@@ -658,7 +658,7 @@ struct device_node *of_get_child_by_name(const struct device_node *node,
} }
EXPORT_SYMBOL(of_get_child_by_name); 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) const char *path)
{ {
struct device_node *child; struct device_node *child;
......
...@@ -110,6 +110,8 @@ extern void *__unflatten_device_tree(const void *blob, ...@@ -110,6 +110,8 @@ extern void *__unflatten_device_tree(const void *blob,
struct property *__of_prop_dup(const struct property *prop, gfp_t allocflags); 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, ...); __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, struct device_node *__of_find_node_by_full_path(struct device_node *node,
const char *path); const char *path);
......
...@@ -37,6 +37,7 @@ struct fragment { ...@@ -37,6 +37,7 @@ struct fragment {
/** /**
* struct overlay_changeset * struct overlay_changeset
* @ovcs_list: list on which we are located * @ovcs_list: list on which we are located
* @overlay_tree: expanded device tree that contains the fragment nodes
* @count: count of fragment structures * @count: count of fragment structures
* @fragments: fragment nodes in the overlay expanded device tree * @fragments: fragment nodes in the overlay expanded device tree
* @symbols_fragment: last element of @fragments[] is the __symbols__ node * @symbols_fragment: last element of @fragments[] is the __symbols__ node
...@@ -45,6 +46,7 @@ struct fragment { ...@@ -45,6 +46,7 @@ struct fragment {
struct overlay_changeset { struct overlay_changeset {
int id; int id;
struct list_head ovcs_list; struct list_head ovcs_list;
struct device_node *overlay_tree;
int count; int count;
struct fragment *fragments; struct fragment *fragments;
bool symbols_fragment; bool symbols_fragment;
...@@ -145,12 +147,13 @@ static int overlay_notify(struct overlay_changeset *ovcs, ...@@ -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 * The paths refer to a node in the subtree of a fragment node's "__overlay__"
* node in the subtree of a fragment node's "__overlay__" node, for * node, for example "/fragment@0/__overlay__/symbol_path_tail",
* example "/fragment@0/__overlay__/symbol_path_tail". Symbol_path_tail * where symbol_path_tail can be a single node or it may be a multi-node path.
* can be a single node or it may be a multi-node path.
* *
* The duplicated property value will be modified by replacing the * The duplicated property value will be modified by replacing the
* "/fragment_name/__overlay/" portion of the value with the target * "/fragment_name/__overlay/" portion of the value with the target
...@@ -160,59 +163,76 @@ static struct property *dup_and_fixup_symbol_prop( ...@@ -160,59 +163,76 @@ static struct property *dup_and_fixup_symbol_prop(
struct overlay_changeset *ovcs, const struct property *prop) struct overlay_changeset *ovcs, const struct property *prop)
{ {
struct fragment *fragment; struct fragment *fragment;
struct property *new; struct property *new_prop;
const char *overlay_name; struct device_node *fragment_node;
char *symbol_path_tail; struct device_node *overlay_node;
char *symbol_path; const char *path;
const char *path_tail;
const char *target_path; const char *target_path;
int k; int k;
int symbol_path_tail_len;
int overlay_name_len; int overlay_name_len;
int path_len;
int path_tail_len;
int target_path_len; int target_path_len;
if (!prop->value) if (!prop->value)
return NULL; 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 (path_len < 1)
if (!new)
return NULL; 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++) { for (k = 0; k < ovcs->count; k++) {
fragment = &ovcs->fragments[k]; fragment = &ovcs->fragments[k];
overlay_name = fragment->overlay->full_name; if (fragment->overlay == overlay_node)
overlay_name_len = strlen(overlay_name);
if (!strncasecmp(symbol_path, overlay_name, overlay_name_len))
break; break;
} }
if (k >= ovcs->count) if (k >= ovcs->count)
goto err_free; return NULL;
overlay_name_len = snprintf(NULL, 0, "%pOF", fragment->overlay);
if (overlay_name_len > path_len)
return NULL;
path_tail = path + overlay_name_len;
path_tail_len = strlen(path_tail);
target_path = fragment->target->full_name; target_path = kasprintf(GFP_KERNEL, "%pOF", fragment->target);
if (!target_path)
return NULL;
target_path_len = strlen(target_path); target_path_len = strlen(target_path);
symbol_path_tail = symbol_path + overlay_name_len; new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL);
symbol_path_tail_len = strlen(symbol_path_tail); if (!new_prop)
goto err_free_target_path;
new->name = kstrdup(prop->name, GFP_KERNEL); new_prop->name = kstrdup(prop->name, GFP_KERNEL);
new->length = target_path_len + symbol_path_tail_len + 1; new_prop->length = target_path_len + path_tail_len + 1;
new->value = kzalloc(new->length, GFP_KERNEL); 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) strcpy(new_prop->value, target_path);
goto err_free; strcpy(new_prop->value + target_path_len, path_tail);
strcpy(new->value, target_path); of_property_set_flag(new_prop, OF_DYNAMIC);
strcpy(new->value + target_path_len, symbol_path_tail);
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; return NULL;
} }
...@@ -519,6 +539,8 @@ static int init_overlay_changeset(struct overlay_changeset *ovcs, ...@@ -519,6 +539,8 @@ static int init_overlay_changeset(struct overlay_changeset *ovcs,
if (!of_node_is_root(tree)) if (!of_node_is_root(tree))
pr_debug("%s() tree is not root\n", __func__); pr_debug("%s() tree is not root\n", __func__);
ovcs->overlay_tree = tree;
INIT_LIST_HEAD(&ovcs->ovcs_list); INIT_LIST_HEAD(&ovcs->ovcs_list);
of_changeset_init(&ovcs->cset); of_changeset_init(&ovcs->cset);
......
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