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virtio_net: use correct accessors for scatterlists 

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>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ira W. Snyder 2009-01-26 21:00:33 -08:00 committed by David S. Miller
parent 5376071069
commit 8527bec548
1 changed files with 3 additions and 3 deletions
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6
drivers/net/virtio_net.c
View File

@ -287,7 +287,7 @@ 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++) {
@ -488,9 +488,9 @@ 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;