netdev - [NET]: Please revert disallowing zero listen queues

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Date:	Tue, 6 Mar 2007 13:32:09 +0000
From:	Gerrit Renker <gerrit@....abdn.ac.uk>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, weid@...css.fujitsu.com
Subject: [NET]: Please revert disallowing zero listen queues

Please can you reconsider the patch regarding the accept_queue

http://git.kernel.org/?p=linux/kernel/git/davem/net-2.6.22.git;a=commit;h=8488df894d05d6fa41c2bd298c335f944bb0e401

It disallows to set a `backlog' argument to listen(2) of zero. Using
a zero backlog is often done (e.g. ttcp), and disallowing a zero 
backlog will break many applications. I had to recode several applications
which rely on this convention.

The problem further spreads from TCP to DCCP (same behaviour).

Below is a patch to revert this change.

Thank you 
Gerrit

diff --git a/include/net/sock.h b/include/net/sock.h
index 849c7df..2c7d60c 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -426,7 +426,7 @@ static inline void sk_acceptq_added(stru
 
 static inline int sk_acceptq_is_full(struct sock *sk)
 {
-	return sk->sk_ack_backlog >= sk->sk_max_ack_backlog;
+	return sk->sk_ack_backlog > sk->sk_max_ack_backlog;
 }
 
 /*
-
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