linux-kernel - [PATCH AUTOSEL 4.18 13/92] KVM: PPC: Book3S HV: Add of_node

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Message-ID: <20180915012944.179481-13-alexander.levin@microsoft.com>
Date:   Sat, 15 Sep 2018 01:29:57 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Nicholas Mc Guire <hofrat@...dl.org>,
        Paul Mackerras <paulus@...abs.org>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.18 13/92] KVM: PPC: Book3S HV: Add of_node_put() in
 success path

From: Nicholas Mc Guire <hofrat@...dl.org>

[ Upstream commit 51eaa08f029c7343df846325d7cf047be8b96e81 ]

The call to of_find_compatible_node() is returning a pointer with
incremented refcount so it must be explicitly decremented after the
last use. As here it is only being used for checking of node presence
but the result is not actually used in the success path it can be
dropped immediately.

Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
Fixes: commit f725758b899f ("KVM: PPC: Book3S HV: Use OPAL XICS emulation on POWER9")
Signed-off-by: Paul Mackerras <paulus@...abs.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 arch/powerpc/kvm/book3s_hv.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index a995513573c2..2ebd5132a29f 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -4562,6 +4562,8 @@ static int kvmppc_book3s_init_hv(void)
 			pr_err("KVM-HV: Cannot determine method for accessing XICS\n");
 			return -ENODEV;
 		}
+		/* presence of intc confirmed - node can be dropped again */
+		of_node_put(np);
 	}
 #endif
 
-- 
2.17.1