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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2008-05-17 08:35:36 +0100
committerJeff Garzik <jgarzik@redhat.com>2008-05-22 06:19:18 -0400
commit5a0a92e67b5009a71e011658da04fb92dad8961f (patch)
tree972c08baf56fbd8abfcf5d5854567e846b322e80 /drivers/net/sc92031.c
parent789585e968f07653a29a9e829aed20386043636c (diff)
[SC92031] Using padto turned driver into an IPv6-only interface
IPv4 would work with this driver only with static arp table entries, the patch reverts a padto introduced in commit 26a17b7bbb36a8552d531bc1ad08472fb5aa3007 sc92031: start transmit return value bugfix The padto does not work because the driver code evaluates `len' later on and there are cases where skb->len is not updated accordingly. This was observed with ARP frames (skb->len = 42 bytes, !skb_cloned(), skb_tailroom = 84 bytes). Then in skb_pad(), the first condition is true, where skb->len is not updated. As a consequence, the driver uses 42 bytes instead of the 60 bytes, and the ARP frame never makes it onto the wire. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/net/sc92031.c')
-rw-r--r--drivers/net/sc92031.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/net/sc92031.c b/drivers/net/sc92031.c
index f64a860029b..b4b63805ee8 100644
--- a/drivers/net/sc92031.c
+++ b/drivers/net/sc92031.c
@@ -953,9 +953,6 @@ static int sc92031_start_xmit(struct sk_buff *skb, struct net_device *dev)
unsigned entry;
u32 tx_status;
- if (skb_padto(skb, ETH_ZLEN))
- return NETDEV_TX_OK;
-
if (unlikely(skb->len > TX_BUF_SIZE)) {
dev->stats.tx_dropped++;
goto out;
@@ -975,6 +972,11 @@ static int sc92031_start_xmit(struct sk_buff *skb, struct net_device *dev)
skb_copy_and_csum_dev(skb, priv->tx_bufs + entry * TX_BUF_SIZE);
len = skb->len;
+ if (unlikely(len < ETH_ZLEN)) {
+ memset(priv->tx_bufs + entry * TX_BUF_SIZE + len,
+ 0, ETH_ZLEN - len);
+ len = ETH_ZLEN;
+ }
wmb();