linux-kernel - Re: [PATCH 1/9] powerpc,kvm: fix imbalance srcu_read

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Message-ID: <20130317212648.GA4259@iris.ozlabs.ibm.com>
Date:	Mon, 18 Mar 2013 08:26:48 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Gleb Natapov <gleb@...hat.com>, Alexander Graf <agraf@...e.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	kvm@...r.kernel.org, kvm-ppc@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 1/9] powerpc,kvm: fix imbalance srcu_read_[un]lock()

On Sat, Mar 16, 2013 at 12:50:49AM +0800, Lai Jiangshan wrote:
> At the point of up_out label in kvmppc_hv_setup_htab_rma(),
> srcu read lock is still held.
> 
> We have to release 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
> ---
>  arch/powerpc/kvm/book3s_hv.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> 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;

Acked-by: Paul Mackerras <paulus@...ba.org>
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