Commit f9627881 authored by Frank Rowand's avatar Frank Rowand
Browse files

of: overlay: set node fields from properties when add new overlay node 



Overlay nodes added by add_changeset_node() do not have the node
fields name, phandle, and type set.

The node passed to __of_attach_node() when the add node changeset
entry is processed does not contain any properties.  The node's
properties are located in add property changeset entries that will
be processed after the add node changeset is applied.

Set the node's fields in the node contained in the add node
changeset entry and do not set them to incorrect values in
add_changeset_node().

A visible symptom that is fixed by this patch is the names of nodes
added by overlays that have an entry in /sys/bus/platform/drivers/*/
will contain the unit-address but the node-name will be <NULL>,  for
example, "fc4ab000.<NULL>".  After applying the patch the name, in
this example, for node restart@fc4ab000 is "fc4ab000.restart".

Tested-by: default avatarAlan Tull <atull@kernel.org>
Signed-off-by: default avatarFrank Rowand <frank.rowand@sony.com>
parent 8c329655

drivers/of/dynamic.c

+18 −9
Original line number Diff line number Diff line
@@ -205,15 +205,24 @@ static void __of_attach_node(struct device_node *np) 
	const __be32 *phandle;

	int sz;



	np->name = __of_get_property(np, "name", NULL) ? : "<NULL>";

	np->type = __of_get_property(np, "device_type", NULL) ? : "<NULL>";

	if (!of_node_check_flag(np, OF_OVERLAY)) {

		np->name = __of_get_property(np, "name", NULL);

		np->type = __of_get_property(np, "device_type", NULL);

		if (!np->name)

			np->name = "<NULL>";

		if (!np->type)

			np->type = "<NULL>";



		phandle = __of_get_property(np, "phandle", &sz);

		if (!phandle)

			phandle = __of_get_property(np, "linux,phandle", &sz);

		if (IS_ENABLED(CONFIG_PPC_PSERIES) && !phandle)

			phandle = __of_get_property(np, "ibm,phandle", &sz);

	np->phandle = (phandle && (sz >= 4)) ? be32_to_cpup(phandle) : 0;

		if (phandle && (sz >= 4))

			np->phandle = be32_to_cpup(phandle);

		else

			np->phandle = 0;

	}



	np->child = NULL;

	np->sibling = np->parent->child;

drivers/of/overlay.c

+24 −5
Original line number Diff line number Diff line
@@ -307,6 +307,7 @@ static int add_changeset_property(struct overlay_changeset *ovcs, 
	int ret = 0;

	bool check_for_non_overlay_node = false;



	if (target->in_livetree)

		if (!of_prop_cmp(overlay_prop->name, "name") ||

		    !of_prop_cmp(overlay_prop->name, "phandle") ||

		    !of_prop_cmp(overlay_prop->name, "linux,phandle"))
@@ -330,6 +331,10 @@ static int add_changeset_property(struct overlay_changeset *ovcs, 


	if (!prop) {

		check_for_non_overlay_node = true;

		if (!target->in_livetree) {

			new_prop->next = target->np->deadprops;

			target->np->deadprops = new_prop;

		}

		ret = of_changeset_add_property(&ovcs->cset, target->np,

						new_prop);

	} else if (!of_prop_cmp(prop->name, "#address-cells")) {
@@ -400,9 +405,10 @@ static int add_changeset_node(struct overlay_changeset *ovcs, 
		struct target *target, struct device_node *node)

{

	const char *node_kbasename;

	const __be32 *phandle;

	struct device_node *tchild;

	struct target target_child;

	int ret = 0;

	int ret = 0, size;



	node_kbasename = kbasename(node->full_name);
@@ -416,6 +422,19 @@ static int add_changeset_node(struct overlay_changeset *ovcs, 
			return -ENOMEM;



		tchild->parent = target->np;

		tchild->name = __of_get_property(node, "name", NULL);

		tchild->type = __of_get_property(node, "device_type", NULL);



		if (!tchild->name)

			tchild->name = "<NULL>";

		if (!tchild->type)

			tchild->type = "<NULL>";



		/* ignore obsolete "linux,phandle" */

		phandle = __of_get_property(node, "phandle", &size);

		if (phandle && (size == 4))

			tchild->phandle = be32_to_cpup(phandle);



		of_node_set_flag(tchild, OF_OVERLAY);



		ret = of_changeset_attach_node(&ovcs->cset, tchild);

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