linux-kernel - Re: [PATCH v3 0/3] virtio DMA API core stuff

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Date:	Wed, 28 Oct 2015 15:53:24 +0900
From:	David Woodhouse <dwmw2@...radead.org>
To:	Andy Lutomirski <luto@...nel.org>, linux-kernel@...r.kernel.org
Cc:	Joerg Roedel <jroedel@...e.de>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Christoph Hellwig <hch@....de>, benh@...nel.crashing.org,
	KVM <kvm@...r.kernel.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-s390 <linux-s390@...r.kernel.org>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v3 0/3] virtio DMA API core stuff

On Tue, 2015-10-27 at 23:38 -0700, Andy Lutomirski wrote:
> 
> Changes from v2:
>  - Fix really embarrassing bug.  This version actually works.

So embarrassing you didn't want to tell us what it was? ...

--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -292,7 +292,7 @@ static inline int virtqueue_add(struct virtqueue *_vq,
                        vq, desc, total_sg * sizeof(struct vring_desc),
                        DMA_TO_DEVICE);
 
-               if (vring_mapping_error(vq, vq->vring.desc[head].addr))
+               if (vring_mapping_error(vq, addr))
                        goto unmap_release;
 
                vq->vring.desc[head].flags = cpu_to_virtio16(_vq->vdev, VRING_DESC_F_INDIRECT);

That wasn't going to be the reason for Christian's failure, was it?


-- 
dwmw2



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