xfrm: Revert false event eliding commits.

As reported by Alexey Dobriyan:

--------------------
setkey now takes several seconds to run this simple script
and it spits "recv: Resource temporarily unavailable" messages.

#!/usr/sbin/setkey -f
flush;
spdflush;

add A B ipcomp 44 -m tunnel -C deflate;
add B A ipcomp 45 -m tunnel -C deflate;

spdadd A B any -P in ipsec
        ipcomp/tunnel/192.168.1.2-192.168.1.3/use;
spdadd B A any -P out ipsec
        ipcomp/tunnel/192.168.1.3-192.168.1.2/use;
--------------------

Obviously applications want the events even when the table
is empty.  So we cannot make this behavioral change.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 6 deletions

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 9fa3322b2a7d..c9d6a5f1348d 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -603,14 +603,13 @@ xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audi
 
 int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info)
 {
-        int i, err = 0, cnt = 0;
+        int i, err = 0;
 
         spin_lock_bh(&xfrm_state_lock);
         err = xfrm_state_flush_secctx_check(net, proto, audit_info);
         if (err)
                 goto out;
 
-        err = -ESRCH;
         for (i = 0; i <= net->xfrm.state_hmask; i++) {
                 struct hlist_node *entry;
                 struct xfrm_state *x;
@@ -627,16 +626,13 @@ restart:
                                                         audit_info->sessionid,
                                                         audit_info->secid);
                                 xfrm_state_put(x);
-                                if (!err)
-                                        cnt++;
 
                                 spin_lock_bh(&xfrm_state_lock);
                                 goto restart;
                         }
                 }
         }
-        if (cnt)
-                err = 0;
+        err = 0;
 
 out:
         spin_unlock_bh(&xfrm_state_lock);