Messages in this thread Patch in this message | | | From | Rusty Russell <> | Subject | Re: [PATCH] virtio_net: use correct accessors for scatterlists | Date | Tue, 27 Jan 2009 15:21:19 +1030 |
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On Saturday 24 January 2009 10:40:53 Ira Snyder wrote: > Without this fix, virtio_net makes incorrect usage of scatterlists. It sets > the end of the scatterlist chain after the first element, despite the fact > that more entries come after it. > > If you try to run dma_map_sg() on one of the scatterlists given to you by > add_buf(), you will get a null pointer oops. > > Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Thanks, this should go in 2.6.29. Dave?
Cheers, Rusty.
Subject: virtio_net: use correct accessors for scatterlists Date: Fri, 23 Jan 2009 16:10:53 -0800 From: Ira Snyder <iws@ovro.caltech.edu>
Without this fix, virtio_net makes incorrect usage of scatterlists. It sets the end of the scatterlist chain after the first element, despite the fact that more entries come after it.
If you try to run dma_map_sg() on one of the scatterlists given to you by add_buf(), you will get a null pointer oops.
Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> --- drivers/net/virtio_net.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 43f6523..67ea2cf 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -286,7 +286,7 @@ static void try_fill_recv_maxbufs(struct virtnet_info *vi) skb_put(skb, MAX_PACKET_LEN); hdr = skb_vnet_hdr(skb); - sg_init_one(sg, hdr, sizeof(*hdr)); + sg_set_buf(sg, hdr, sizeof(*hdr)); if (vi->big_packets) { for (i = 0; i < MAX_SKB_FRAGS; i++) { @@ -487,9 +487,9 @@ static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb) /* Encode metadata header at front. */ if (vi->mergeable_rx_bufs) - sg_init_one(sg, mhdr, sizeof(*mhdr)); + sg_set_buf(sg, mhdr, sizeof(*mhdr)); else - sg_init_one(sg, hdr, sizeof(*hdr)); + sg_set_buf(sg, hdr, sizeof(*hdr)); num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
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