linux-kernel - [PATCH 16/21]: powerpc/cell spidernet

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Date:	Tue, 10 Oct 2006 16:15:29 -0500
From:	linas@...tin.ibm.com (Linas Vepstas)
To:	akpm@...l.org
Cc:	jeff@...zik.org, Arnd Bergmann <arnd@...db.de>,
	netdev@...r.kernel.org, James K Lewis <jklewis@...ibm.com>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org
Subject: [PATCH 16/21]: powerpc/cell spidernet


Remove a dummy register read that is not needed.
This reduces CPU usage notably during transmit.

Signed-off-by: Linas Vepstas <linas@...tin.ibm.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: James K Lewis <jklewis@...ibm.com>

----
 drivers/net/spider_net.c |    2 --
 1 file changed, 2 deletions(-)

Index: linux-2.6.18-mm2/drivers/net/spider_net.c
===================================================================
--- linux-2.6.18-mm2.orig/drivers/net/spider_net.c	2006-10-10 13:20:08.000000000 -0500
+++ linux-2.6.18-mm2/drivers/net/spider_net.c	2006-10-10 13:21:41.000000000 -0500
@@ -759,8 +759,6 @@ spider_net_release_tx_chain(struct spide
 	unsigned long flags;
 	int status;
 
-	spider_net_read_reg(card, SPIDER_NET_GDTDMACCNTR);
-
 	while (chain->tail != chain->head) {
 		spin_lock_irqsave(&chain->lock, flags);
 		descr = chain->tail;
-
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