net: fix network drivers ndo_start_xmit() return values (part 2)

Fix up IRDA drivers that return an errno value to qdisc_restart(), causing
qdisc_restart() to print a warning an requeue/retransmit the skb.

- donauboe: intention appears to be to have the skb retransmitted without
            error message
- irda-usb: intention is to drop silently according to comment
- kingsub-sir: skb is freed: use after free
- ks959-sir: skb is freed: use after free
- ksdazzle-sir: skb is freed: use after free
- mcs7880: skb is freed: use after free

All but donauboe compile tested.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 4 deletions

diff --git a/drivers/net/irda/ks959-sir.c b/drivers/net/irda/ks959-sir.c
index b6ffe9715b61..d73b8b64fcb9 100644
--- a/drivers/net/irda/ks959-sir.c
+++ b/drivers/net/irda/ks959-sir.c
@@ -391,9 +391,6 @@ static int ks959_hard_xmit(struct sk_buff *skb, struct net_device *netdev)
         unsigned int wraplen;
         int ret = 0;
 
-        if (skb == NULL || netdev == NULL)
-                return -EINVAL;
-
         netif_stop_queue(netdev);
 
         /* the IRDA wrapping routines don't deal with non linear skb */
@@ -428,7 +425,7 @@ static int ks959_hard_xmit(struct sk_buff *skb, struct net_device *netdev)
         dev_kfree_skb(skb);
         spin_unlock(&kingsun->lock);
 
-        return ret;
+        return NETDEV_TX_OK;
 }
 
 /* Receive callback function */