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Revert "netlink: netlink_recvmsg() fix" 

This reverts commit 1235f504aa.

It causes regressions worse than the problem it was trying
to fix.  Eric will try to solve the problem another way.

Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
David S. Miller 2010-08-15 23:21:50 -07:00
parent f3d3f616e3
commit daa3766e70
1 changed files with 6 additions and 16 deletions
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22
net/netlink/af_netlink.c
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@ -1406,7 +1406,7 @@ static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock,
struct netlink_sock *nlk = nlk_sk(sk);
int noblock = flags&MSG_DONTWAIT;
size_t copied;
struct sk_buff *skb;
struct sk_buff *skb, *frag __maybe_unused = NULL;
int err;
if (flags&MSG_OOB)
@ -1441,21 +1441,7 @@ static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock,
kfree_skb(skb);
skb = compskb;
} else {
/*
* Before setting frag_list to NULL, we must get a
* private copy of skb if shared (because of MSG_PEEK)
*/
if (skb_shared(skb)) {
struct sk_buff *nskb;
nskb = pskb_copy(skb, GFP_KERNEL);
kfree_skb(skb);
skb = nskb;
err = -ENOMEM;
if (!skb)
goto out;
}
kfree_skb(skb_shinfo(skb)->frag_list);
frag = skb_shinfo(skb)->frag_list;
skb_shinfo(skb)->frag_list = NULL;
}
}
@ -1492,6 +1478,10 @@ static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock,
if (flags & MSG_TRUNC)
copied = skb->len;
#ifdef CONFIG_COMPAT_NETLINK_MESSAGES
skb_shinfo(skb)->frag_list = frag;
#endif
skb_free_datagram(sk, skb);
if (nlk->cb && atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf / 2)