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

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Date:	Thu, 26 Jul 2012 10:20:02 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Sasha Levin <levinsasha928@...il.com>
CC:	Jason Wang <jasowang@...hat.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

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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