linux-kernel - [PATCH v6 15/18] of: overlay: set node fields from properties when add new overlay node

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Date:   Mon,  5 Nov 2018 07:25:12 -0800
From:   frowand.list@...il.com
To:     Rob Herring <robh+dt@...nel.org>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Alan Tull <atull@...nel.org>, Moritz Fischer <mdf@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        devicetree@...r.kernel.org, linux-fpga@...r.kernel.org
Subject: [PATCH v6 15/18] of: overlay: set node fields from properties when add new overlay node

From: Frank Rowand <frank.rowand@...y.com>

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@...ab000 is "fc4ab000.restart".

Tested-by: Alan Tull <atull@...nel.org>
Signed-off-by: Frank Rowand <frank.rowand@...y.com>
---
 drivers/of/dynamic.c | 27 ++++++++++++++++++---------
 drivers/of/overlay.c | 29 ++++++++++++++++++++++++-----
 2 files changed, 42 insertions(+), 14 deletions(-)

diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
index beea792debb6..43e1ccb9c387 100644
--- a/drivers/of/dynamic.c
+++ b/drivers/of/dynamic.c
@@ -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>";
-
-	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 (!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);
+		if (phandle && (sz >= 4))
+			np->phandle = be32_to_cpup(phandle);
+		else
+			np->phandle = 0;
+	}
 
 	np->child = NULL;
 	np->sibling = np->parent->child;
diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
index 184cc2c4a931..2b5ac43a5690 100644
--- a/drivers/of/overlay.c
+++ b/drivers/of/overlay.c
@@ -307,10 +307,11 @@ static int add_changeset_property(struct overlay_changeset *ovcs,
 	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") ||
-	    !of_prop_cmp(overlay_prop->name, "linux,phandle"))
-		return 0;
+	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"))
+			return 0;
 
 	if (target->in_livetree)
 		prop = of_find_property(target->np, overlay_prop->name, NULL);
@@ -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);
-- 
Frank Rowand <frank.rowand@...y.com>