linux-kernel - Re: [PATCH] KVM: x86: drop unneeded null test

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Message-ID: <553F5982.4010405@redhat.com>
Date:	Tue, 28 Apr 2015 11:57:22 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Julia Lawall <Julia.Lawall@...6.fr>,
	Gleb Natapov <gleb@...nel.org>,
	"Michael S . Tsirkin" <mst@...hat.com>, zhanghy@...gfor.com,
	jasowang@...hat.com
CC:	kernel-janitors@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: x86: drop unneeded null test



On 27/04/2015 22:35, Julia Lawall wrote:
> From: Julia Lawall <Julia.Lawall@...6.fr>
> 
> If the null test is needed, the call to cancel_delayed_work_sync would have
> already crashed.  Normally, the destroy function should only be called
> if the init functoin has succeeded, in which case ioapic is not null.
> 
> Problem found using Coccinelle.
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

Applied, thanks.

Paolo

> ---
>  arch/x86/kvm/ioapic.c |    8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/x86/kvm/ioapic.c b2/arch/x86/kvm/ioapic.c
> index 28146f0..09828e2 100644
> --- a/arch/x86/kvm/ioapic.c
> +++ b2/arch/x86/kvm/ioapic.c
> @@ -637,11 +637,9 @@ void kvm_ioapic_destroy(struct kvm *kvm)
>  	struct kvm_ioapic *ioapic = kvm->arch.vioapic;
>  
>  	cancel_delayed_work_sync(&ioapic->eoi_inject);
> -	if (ioapic) {
> -		kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, &ioapic->dev);
> -		kvm->arch.vioapic = NULL;
> -		kfree(ioapic);
> -	}
> +	kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, &ioapic->dev);
> +	kvm->arch.vioapic = NULL;
> +	kfree(ioapic);
>  }
>  
>  int kvm_get_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
> 
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