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[S390]: Fix use of skb after netif_rx

Browse Source 
Recently, Wang Chen submitted a patch
(d30f53aeb31d453a5230f526bea592af07944564) to move a call to netif_rx(skb)
after a subsequent reference to skb, because netif_rx may call kfree_skb on
its argument.  netif_rx_ni calls netif_rx, so the same problem occurs in
the files below.

I have left the updating of dev->last_rx after the calls to netif_rx_ni
because it seems time dependent, but moved the other field updates before.

This was found using the following semantic match.
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@@
expression skb, e,e1;
@@

(
 netif_rx(skb);
|
 netif_rx_ni(skb);
)
  ... when != skb = e
(
  skb = e1
|
* skb
)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julia Lawall 2007-12-10 17:17:37 -08:00 committed by David S. Miller
parent 299f590f26
commit 9b3efc0133
2 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/s390/net/ctcmain.c
View File

@ -478,14 +478,14 @@ ctc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
skb->dev = pskb->dev;
skb->protocol = pskb->protocol;
pskb->ip_summed = CHECKSUM_UNNECESSARY;
netif_rx_ni(skb);
/**
* Successful rx; reset logflags
* reset logflags
*/
ch->logflags = 0;
dev->last_rx = jiffies;
privptr->stats.rx_packets++;
privptr->stats.rx_bytes += skb->len;
netif_rx_ni(skb);
dev->last_rx = jiffies;
if (len > 0) {
skb_pull(pskb, header->length);
if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {

4
drivers/s390/net/netiucv.c
View File

@ -639,14 +639,14 @@ static void netiucv_unpack_skb(struct iucv_connection *conn,
skb->dev = pskb->dev;
skb->protocol = pskb->protocol;
pskb->ip_summed = CHECKSUM_UNNECESSARY;
privptr->stats.rx_packets++;
privptr->stats.rx_bytes += skb->len;
/*
* Since receiving is always initiated from a tasklet (in iucv.c),
* we must use netif_rx_ni() instead of netif_rx()
*/
netif_rx_ni(skb);
dev->last_rx = jiffies;
privptr->stats.rx_packets++;
privptr->stats.rx_bytes += skb->len;
skb_pull(pskb, header->next);
skb_put(pskb, NETIUCV_HDRLEN);
}