linux-kernel - [PATCH 3.15 17/37] powerpc/pseries: dynamically added OF nodes need to call of_node

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Date:	Tue, 29 Jul 2014 18:48:53 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>,
	Nathan Fontenot <nfont@...ux.vnet.ibm.com>,
	Grant Likely <grant.likely@...aro.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: [PATCH 3.15 17/37] powerpc/pseries: dynamically added OF nodes need to call of_node_init

3.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>

commit 97a9a7179aad701ab676e6f29eb90766a1acfde2 upstream.

Commit 75b57ecf9 refactored device tree nodes to use kobjects such that they
can be exposed via /sysfs. A secondary commit 0829f6d1f furthered this rework
by moving the kobect initialization logic out of of_node_add into its own
of_node_init function. The inital commit removed the existing kref_init calls
in the pseries dlpar code with the assumption kobject initialization would
occur in of_node_add. The second commit had the side effect of triggering a
BUG_ON during DLPAR, migration and suspend/resume operations as a result of
dynamically added nodes being uninitialized.

This patch fixes this by adding of_node_init calls in place of the previously
removed kref_init calls.

Fixes: 0829f6d1f69e ("of: device_node kobject lifecycle fixes")
Signed-off-by: Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>
Acked-by: Nathan Fontenot <nfont@...ux.vnet.ibm.com>
Acked-by: Grant Likely <grant.likely@...aro.org>
Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/powerpc/platforms/pseries/dlpar.c    |    1 +
 arch/powerpc/platforms/pseries/reconfig.c |    1 +
 2 files changed, 2 insertions(+)

--- a/arch/powerpc/platforms/pseries/dlpar.c
+++ b/arch/powerpc/platforms/pseries/dlpar.c
@@ -86,6 +86,7 @@ static struct device_node *dlpar_parse_c
 	}
 
 	of_node_set_flag(dn, OF_DYNAMIC);
+	of_node_init(dn);
 
 	return dn;
 }
--- a/arch/powerpc/platforms/pseries/reconfig.c
+++ b/arch/powerpc/platforms/pseries/reconfig.c
@@ -69,6 +69,7 @@ static int pSeries_reconfig_add_node(con
 
 	np->properties = proplist;
 	of_node_set_flag(np, OF_DYNAMIC);
+	of_node_init(np);
 
 	np->parent = derive_parent(path);
 	if (IS_ERR(np->parent)) {


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