linux-kernel - RE: [PATCH retry] arch/ia64/kvm/kvm-ia64.c: Add local_irq

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Date:	Wed, 23 Jul 2008 09:26:12 +0800
From:	"Zhang, Xiantao" <xiantao.zhang@...el.com>
To:	"Julia Lawall" <julia@...u.dk>, <avi@...ranet.com>,
	<kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<kernel-janitors@...r.kernel.org>
Subject: RE: [PATCH retry] arch/ia64/kvm/kvm-ia64.c: Add local_irq_restore in error handling code

Julia Lawall wrote:
> From: Julia Lawall <julia@...u.dk>
> 
> There is a call to local_irq_restore in the normal exit case, so it
> would 
> seem that there should be one on an error return as well.
> 
> The semantic patch that finds this problem is as follows:
> (http://www.emn.fr/x-info/coccinelle/)

Good catch!  Excellent patch to find such issues!
Xiantao

> 
> // <smpl>
> @@
> expression l;
> expression E,E1,E2;
> @@
> 
> local_irq_save(l);
> ... when != local_irq_restore(l)
>     when != spin_unlock_irqrestore(E,l)
>     when any
>     when strict
> (
> if (...) { ... when != local_irq_restore(l)
>                when != spin_unlock_irqrestore(E1,l)
> +   local_irq_restore(l);
>     return ...;
> }
>> 
> if (...)
> +   {local_irq_restore(l);
>     return ...;
> +   }
>> 
> spin_unlock_irqrestore(E2,l);
>> 
> local_irq_restore(l);
> )
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>
> 
> ---
>  .../julia/linuxcopy}/arch/ia64/kvm/kvm-ia64.c      |    5 +++--
>  1 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/home/julia/linux-2.6/arch/ia64/kvm/kvm-ia64.c
> b/var/julia/linuxcopy/arch/ia64/kvm/kvm-ia64.c index 2672f4d..7a37d06
> 100644 --- a/home/julia/linux-2.6/arch/ia64/kvm/kvm-ia64.c
> +++ b/var/julia/linuxcopy/arch/ia64/kvm/kvm-ia64.c
> @@ -125,9 +125,9 @@ void kvm_arch_hardware_enable(void *garbage)
>  				PAGE_KERNEL));
>  	local_irq_save(saved_psr);
>  	slot = ia64_itr_entry(0x3, KVM_VMM_BASE, pte, KVM_VMM_SHIFT);
> +	local_irq_restore(saved_psr);
>  	if (slot < 0)
>  		return;
> -	local_irq_restore(saved_psr);
> 
>  	spin_lock(&vp_lock);
>  	status = ia64_pal_vp_init_env(kvm_vsa_base ?
> @@ -160,9 +160,9 @@ void kvm_arch_hardware_disable(void *garbage)
> 
>  	local_irq_save(saved_psr);
>  	slot = ia64_itr_entry(0x3, KVM_VMM_BASE, pte, KVM_VMM_SHIFT);
> +	local_irq_restore(saved_psr);
>  	if (slot < 0)
>  		return;
> -	local_irq_restore(saved_psr);
> 
>  	status = ia64_pal_vp_exit_env(host_iva);
>  	if (status)
> @@ -1253,6 +1253,7 @@ static int vti_vcpu_setup(struct kvm_vcpu
>  *vcpu, int id) uninit:
>  	kvm_vcpu_uninit(vcpu);
>  fail:
> +	local_irq_restore(psr);
>  	return r;
>  }

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