linux-kernel - [PATCH 1/3] of: Fix early OF builtup on kobj-ification

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Date:	Tue, 10 Dec 2013 16:13:51 +0200
From:	Pantelis Antoniou <panto@...oniou-consulting.com>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	Rob Herring <robherring2@...il.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Matt Porter <matt.porter@...aro.org>,
	Koen Kooi <koen@...inion.thruhere.net>,
	Alison Chaiken <Alison_Chaiken@...tor.com>,
	Dinh Nguyen <dinh.linux@...il.com>,
	Jan Lubbe <jluebbe@...net.de>,
	Alexander Sverdlin <alexander.sverdlin@....com>,
	Michael Stickel <ms@...able.de>,
	Guenter Roeck <linux@...ck-us.net>,
	Dirk Behme <dirk.behme@...il.com>,
	Alan Tull <delicious.quinoa@...il.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Michael Bohan <mbohan@...eaurora.org>,
	Ionut Nicu <ioan.nicu.ext@....com>,
	Michal Simek <monstr@...str.eu>,
	Matt Ranostay <mranostay@...il.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Pantelis Antoniou <panto@...oniou-consulting.com>
Subject: [PATCH 1/3] of: Fix early OF builtup on kobj-ification

When booting platforms that do very early OF initialization before
core_initcalls are performed of_init is called too late.

This results in a hard-hard without getting a chance to output anything.

Fixed by adding a flag that marks when init has been done, and
performing the per-node init at that time.

Signed-off-by: Pantelis Antoniou <panto@...oniou-consulting.com>
---
 drivers/of/base.c | 28 +++++++++++++++++++++++-----
 1 file changed, 23 insertions(+), 5 deletions(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 734689b..a4f3dda 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -98,7 +98,7 @@ int __weak of_node_to_nid(struct device_node *np)
  */
 struct device_node *of_node_get(struct device_node *node)
 {
-	if (node)
+	if (node && of_kset)
 		kobject_get(&node->kobj);
 	return node;
 }
@@ -156,7 +156,7 @@ static void of_node_release(struct kobject *kobj)
  */
 void of_node_put(struct device_node *node)
 {
-	if (node)
+	if (node && of_kset)
 		kobject_put(&node->kobj);
 }
 EXPORT_SYMBOL(of_node_put);
@@ -202,9 +202,16 @@ static const char *safe_name(struct kobject *kobj, const char *orig_name)
 static int __of_add_property(struct device_node *np, struct property *pp)
 {
 	int rc;
+	bool secure;
+
+	/* note that we don't take a lock here */
+
+	/* fake the return while of_init is not yet called */
+	if (!of_kset)
+		return 0;
 
 	/* Important: Don't leak passwords */
-	bool secure = strncmp(pp->name, "security-", 9) == 0;
+	secure = strncmp(pp->name, "security-", 9) == 0;
 
 	pp->attr.attr.name = safe_name(&np->kobj, pp->name);
 	pp->attr.attr.mode = secure ? S_IRUSR : S_IRUGO;
@@ -222,6 +229,12 @@ static int __of_node_add(struct device_node *np)
 	struct property *pp;
 	int rc;
 
+	/* note that we don't take a lock here */
+
+	/* fake the return while of_init is not yet called */
+	if (!of_kset)
+		return 0;
+
 	np->kobj.kset = of_kset;
 	if (!np->parent) {
 		/* Nodes without parents are new top level trees */
@@ -245,11 +258,14 @@ static int __of_node_add(struct device_node *np)
 int of_node_add(struct device_node *np)
 {
 	int rc = 0;
-	kobject_init(&np->kobj, &of_node_ktype);
+
+	/* fake the return while of_init is not yet called */
 	mutex_lock(&of_aliases_mutex);
+	kobject_init(&np->kobj, &of_node_ktype);
 	if (of_kset)
 		rc = __of_node_add(np);
 	mutex_unlock(&of_aliases_mutex);
+
 	return rc;
 }
 
@@ -275,14 +291,16 @@ static int __init of_init(void)
 
 	/* Make sure all nodes added before this time get added to sysfs */
 	mutex_lock(&of_aliases_mutex);
+
 	for_each_of_allnodes(np)
 		__of_node_add(np);
-	mutex_unlock(&of_aliases_mutex);
 
 	/* Symlink in /proc as required by userspace ABI */
 	if (of_allnodes)
 		proc_symlink("device-tree", NULL, "/sys/firmware/devicetree/base");
 
+	mutex_unlock(&of_aliases_mutex);
+
 	return 0;
 }
 core_initcall(of_init);
-- 
1.7.12

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