netfilter: ctnetlink: fix GFP_KERNEL allocation under spinlock

[Patrick McHardy <kaber@trash.net>]

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This patch for 2.6.28 fixes a GFP_KERNEL allocation under spinlock
in ctnetlink that was missed in the conntrack creation race fix.

Please apply, thanks.

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commit 49a12376315f651decfa67c07041e2d0c2e04968
Author: Patrick McHardy <kaber@trash.net>
Date:   Wed Nov 26 12:16:50 2008 +0100

    netfilter: ctnetlink: fix GFP_KERNEL allocation under spinlock
    
    The previous fix for the conntrack creation race (netfilter: ctnetlink:
    fix conntrack creation race) missed a GFP_KERNEL allocation that is
    now performed while holding a spinlock. Switch to GFP_ATOMIC.
    
    Reported-and-tested-by: Zoltan Borbely <bozo@andrews.hu>
    Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 3b009a3..5f4a651 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -1138,7 +1138,7 @@ ctnetlink_create_conntrack(struct nlattr *cda[],
 		}
 	}
 
-	nf_ct_acct_ext_add(ct, GFP_KERNEL);
+	nf_ct_acct_ext_add(ct, GFP_ATOMIC);
 
 #if defined(CONFIG_NF_CONNTRACK_MARK)
 	if (cda[CTA_MARK])