linux-kernel - [PATCH AUTOSEL 4.9 011/107] powerpc/pseries: add of_node_put() in dlpar_detach

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Message-Id: <20190128161947.57405-11-sashal@kernel.org>
Date:   Mon, 28 Jan 2019 11:18:11 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Frank Rowand <frank.rowand@...y.com>,
        Sasha Levin <sashal@...nel.org>, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH AUTOSEL 4.9 011/107] powerpc/pseries: add of_node_put() in dlpar_detach_node()

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

[ Upstream commit 5b3f5c408d8cc59b87e47f1ab9803dbd006e4a91 ]

The previous commit, "of: overlay: add missing of_node_get() in
__of_attach_node_sysfs" added a missing of_node_get() to
__of_attach_node_sysfs().  This results in a refcount imbalance
for nodes attached with dlpar_attach_node().  The calling sequence
from dlpar_attach_node() to __of_attach_node_sysfs() is:

   dlpar_attach_node()
      of_attach_node()
         __of_attach_node_sysfs()

For more detailed description of the node refcount, see
commit 68baf692c435 ("powerpc/pseries: Fix of_node_put() underflow
during DLPAR remove").

Tested-by: Alan Tull <atull@...nel.org>
Acked-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Frank Rowand <frank.rowand@...y.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/powerpc/platforms/pseries/dlpar.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/platforms/pseries/dlpar.c b/arch/powerpc/platforms/pseries/dlpar.c
index 72ae2cdbcd6a..999b04819d69 100644
--- a/arch/powerpc/platforms/pseries/dlpar.c
+++ b/arch/powerpc/platforms/pseries/dlpar.c
@@ -288,6 +288,8 @@ int dlpar_detach_node(struct device_node *dn)
 	if (rc)
 		return rc;
 
+	of_node_put(dn);
+
 	return 0;
 }
 
-- 
2.19.1