From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e32.co.us.ibm.com (e32.co.us.ibm.com [32.97.110.150]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "e32.co.us.ibm.com", Issuer "Equifax" (verified OK)) by ozlabs.org (Postfix) with ESMTP id 0601D67D23 for ; Wed, 11 Oct 2006 07:15:32 +1000 (EST) Received: from westrelay02.boulder.ibm.com (westrelay02.boulder.ibm.com [9.17.195.11]) by e32.co.us.ibm.com (8.13.8/8.12.11) with ESMTP id k9ALFUkC007922 for ; Tue, 10 Oct 2006 17:15:30 -0400 Received: from d03av03.boulder.ibm.com (d03av03.boulder.ibm.com [9.17.195.169]) by westrelay02.boulder.ibm.com (8.13.6/8.13.6/NCO v8.1.1) with ESMTP id k9ALFTqD518254 for ; Tue, 10 Oct 2006 15:15:29 -0600 Received: from d03av03.boulder.ibm.com (loopback [127.0.0.1]) by d03av03.boulder.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id k9ALFTPt031286 for ; Tue, 10 Oct 2006 15:15:29 -0600 Date: Tue, 10 Oct 2006 16:15:29 -0500 To: akpm@osdl.org Subject: [PATCH 16/21]: powerpc/cell spidernet Message-ID: <20061010211528.GM4381@austin.ibm.com> References: <20061010204946.GW4381@austin.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <20061010204946.GW4381@austin.ibm.com> From: linas@austin.ibm.com (Linas Vepstas) Cc: jeff@garzik.org, Arnd Bergmann , netdev@vger.kernel.org, James K Lewis , linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Remove a dummy register read that is not needed. This reduces CPU usage notably during transmit. Signed-off-by: Linas Vepstas Cc: Arnd Bergmann Cc: James K Lewis ---- 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;