Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753980Ab0KZC0D (ORCPT ); Thu, 25 Nov 2010 21:26:03 -0500 Received: from sm-d311v.smileserver.ne.jp ([203.211.202.206]:37734 "EHLO sm-d311v.smileserver.ne.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753499Ab0KZC0B (ORCPT ); Thu, 25 Nov 2010 21:26:01 -0500 Message-ID: <4CEF1A9E.9030402@dsn.okisemi.com> Date: Fri, 26 Nov 2010 11:25:34 +0900 From: Tomoya MORINAGA User-Agent: Mozilla/5.0 (X11; U; Linux i686; ja; rv:1.9.1.15) Gecko/20101027 Thunderbird/3.0.10 MIME-Version: 1.0 To: Wolfgang Grandegger , Wolfram Sang , Christian Pellegrin , Barry Song <21cnbao@gmail.com>, Samuel Ortiz , socketcan-core@lists.berlios.de, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, "David S. Miller" CC: qi.wang@intel.com, yong.y.wang@intel.com, andrew.chih.howe.khor@intel.com, joel.clark@intel.com, kok.howg.ewe@intel.com, margie.foster@intel.com Subject: [PATCH net-next-2.6 17/19 v5] can: EG20T PCH: Optimize "if" condition in rx/tx processing Content-Type: text/plain; charset=ISO-2022-JP Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2396 Lines: 75 Optimize "if" condition in rx/tx processing For reduce "if" condition, easy to read/understand the code, optimize "if" condition in rx/tx processing. Signed-off-by: Tomoya MORINAGA --- drivers/net/can/pch_can.c | 26 ++++++++++---------------- 1 files changed, 10 insertions(+), 16 deletions(-) diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c index 1675045..16806da 100644 --- a/drivers/net/can/pch_can.c +++ b/drivers/net/can/pch_can.c @@ -757,19 +757,16 @@ static int pch_can_poll(struct napi_struct *napi, int quota) if (int_stat == PCH_STATUS_INT) { reg_stat = ioread32(&priv->regs->stat); - if (reg_stat & (PCH_BUS_OFF | PCH_LEC_ALL)) { - if (reg_stat & PCH_BUS_OFF || - (reg_stat & PCH_LEC_ALL) != PCH_LEC_ALL) { - pch_can_error(ndev, reg_stat); - quota--; - } - } - if (reg_stat & PCH_TX_OK) - pch_can_bit_clear(&priv->regs->stat, PCH_TX_OK); + if ((reg_stat & (PCH_BUS_OFF | PCH_LEC_ALL)) && + ((reg_stat & PCH_LEC_ALL) != PCH_LEC_ALL)) { + pch_can_error(ndev, reg_stat); + quota--; + } - if (reg_stat & PCH_RX_OK) - pch_can_bit_clear(&priv->regs->stat, PCH_RX_OK); + if (reg_stat & (PCH_TX_OK | PCH_RX_OK)) + pch_can_bit_clear(&priv->regs->stat, + reg_stat & (PCH_TX_OK | PCH_RX_OK)); int_stat = pch_can_int_pending(priv); } @@ -911,14 +908,13 @@ static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev) if (can_dropped_invalid_skb(ndev, skb)) return NETDEV_TX_OK; + tx_obj_no = priv->tx_obj; if (priv->tx_obj == PCH_TX_OBJ_END) { if (ioread32(&priv->regs->treq2) & PCH_TREQ2_TX_MASK) netif_stop_queue(ndev); - tx_obj_no = priv->tx_obj; priv->tx_obj = PCH_TX_OBJ_START; } else { - tx_obj_no = priv->tx_obj; priv->tx_obj++; } @@ -937,9 +933,7 @@ static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev) id2 |= PCH_ID_MSGVAL; /* If remote frame has to be transmitted.. */ - if (cf->can_id & CAN_RTR_FLAG) - id2 &= ~PCH_ID2_DIR; - else + if (!(cf->can_id & CAN_RTR_FLAG)) id2 |= PCH_ID2_DIR; iowrite32(id2, &priv->regs->ifregs[1].id2); -- 1.6.0.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/