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Date: Fri, 26 Nov 2010 11:25:34 +0900 From: Tomoya MORINAGA <tomoya-linux@....okisemi.com> To: Wolfgang Grandegger <wg@...ndegger.com>, Wolfram Sang <w.sang@...gutronix.de>, Christian Pellegrin <chripell@...e.org>, Barry Song <21cnbao@...il.com>, Samuel Ortiz <sameo@...ux.intel.com>, socketcan-core@...ts.berlios.de, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, "David S. Miller" <davem@...emloft.net> CC: qi.wang@...el.com, yong.y.wang@...el.com, andrew.chih.howe.khor@...el.com, joel.clark@...el.com, kok.howg.ewe@...el.com, margie.foster@...el.com Subject: [PATCH net-next-2.6 17/19 v5] can: EG20T PCH: Optimize "if" condition in rx/tx processing 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 <tomoya-linux@....okisemi.com> --- 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 netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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