linux-kernel - [PATCH] net/packet: remove dead code and unneeded variable from prb_setup_retire_blk

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Date:	Sun, 13 Nov 2011 22:55:50 +0100 (CET)
From:	Jesper Juhl <jj@...osbits.net>
To:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
cc:	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Changli Gao <xiaosuo@...il.com>,
	Ben Greear <greearb@...delatech.com>,
	Chetan Loke <loke.chetan@...il.com>,
	waltje@...lt.NL.Mugnet.ORG, gw4pts@...pts.ampr.org,
	waltje@...ux.com, ross.biro@...il.com, alan@...ux.intel.com
Subject: [PATCH] net/packet: remove dead code and unneeded variable from
 prb_setup_retire_blk_timer()

We test for 'tx_ring' being != zero and BUG() if that's the case. So after
that check there is no way that 'tx_ring' could be anything _but_ zero, so
testing it again is just dead code. Once that dead code is removed, the
'pkc' local variable becomes entirely redundant, so remove that as well.

Signed-off-by: Jesper Juhl <jj@...osbits.net>
---
 net/packet/af_packet.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

 only compile tested.

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 82a6f34..ab10e84 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -516,13 +516,11 @@ static void prb_init_blk_timer(struct packet_sock *po,
 
 static void prb_setup_retire_blk_timer(struct packet_sock *po, int tx_ring)
 {
-	struct tpacket_kbdq_core *pkc;
-
 	if (tx_ring)
 		BUG();
 
-	pkc = tx_ring ? &po->tx_ring.prb_bdqc : &po->rx_ring.prb_bdqc;
-	prb_init_blk_timer(po, pkc, prb_retire_rx_blk_timer_expired);
+	prb_init_blk_timer(po, &po->rx_ring.prb_bdqc,
+			   prb_retire_rx_blk_timer_expired);
 }
 
 static int prb_calc_retire_blk_tmo(struct packet_sock *po,
-- 
1.7.7.3


-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
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