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

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Date:	Wed, 11 Dec 2013 08:06:42 +0100
From:	Koen Kooi <koen@...inion.thruhere.net>
To:	Pantelis Antoniou <panto@...oniou-consulting.com>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <robherring2@...il.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Matt Porter <matt.porter@...aro.org>,
	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>,
	Device Tree Mailing List <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] of: Fix early OF builtup on kobj-ification


Op 10 dec. 2013, om 15:13 heeft Pantelis Antoniou <panto@...oniou-consulting.com> het volgende geschreven:

> 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.

I think that should be 'hard-hang'.

regards,

Koen

> 
> 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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