linux-kernel - Re: [net-next RFC V5 2/5] virtio_ring: move queue_index to vring

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Message-ID: <5015FFDE.5030007@redhat.com>
Date:	Mon, 30 Jul 2012 11:30:38 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
CC:	Sasha Levin <levinsasha928@...il.com>, krkumar2@...ibm.com,
	habanero@...ux.vnet.ibm.com, mashirle@...ibm.com,
	kvm@...r.kernel.org, mst@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, edumazet@...gle.com,
	tahm@...ux.vnet.ibm.com, jwhan@...ewood.snu.ac.kr,
	davem@...emloft.net, sri@...ibm.com
Subject: Re: [net-next RFC V5 2/5] virtio_ring: move queue_index to vring_virtqueue

On 07/26/2012 04:20 PM, Paolo Bonzini wrote:
> Il 05/07/2012 13:40, Sasha Levin ha scritto:
>> @@ -275,7 +274,7 @@ static void vm_del_vq(struct virtqueue *vq)
>>          vring_del_virtqueue(vq);
>>
>>          /* Select and deactivate the queue */
>> -       writel(info->queue_index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL);
>> +       writel(virtqueue_get_queue_index(vq), vm_dev->base + VIRTIO_MMIO_QUEUE_SEL);
>>          writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN);
>>
> This accesses vq after vring_del_virtqueue has freed it.
>
> Paolo
>
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Yes, so need a temporary variable before vring_del_virtqueue().

Thanks.
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