linux-kernel - [PATCH tip/core/rcu 2/2] powerpc,kvm: Fix unbalanced srcu_read

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Date:	Fri, 12 Apr 2013 16:38:47 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, edumazet@...gle.com, darren@...art.com,
	fweisbec@...il.com, sbw@....edu,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Gleb Natapov <gleb@...hat.com>, Alexander Graf <agraf@...e.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>, kvm@...r.kernel.org,
	kvm-ppc@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 2/2] powerpc,kvm: Fix unbalanced srcu_read_[un]lock()

From: Lai Jiangshan <laijs@...fujitsu.com>

At the up_out: label in kvmppc_hv_setup_htab_rma(), srcu_read_lock()
is still held.  This commit therefore have to releases it before return.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
Cc: Marcelo Tosatti <mtosatti@...hat.com>
Cc: Gleb Natapov <gleb@...hat.com>
Cc: Alexander Graf <agraf@...e.de>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: kvm@...r.kernel.org
Cc: kvm-ppc@...r.kernel.org
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 arch/powerpc/kvm/book3s_hv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 80dcc53..c26740e 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -1799,7 +1799,7 @@ static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
 
  up_out:
 	up_read(&current->mm->mmap_sem);
-	goto out;
+	goto out_srcu;
 }
 
 int kvmppc_core_init_vm(struct kvm *kvm)
-- 
1.8.1.5

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