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Date: Thu, 25 Sep 2008 08:35:22 +0800 From: Kevin Hao <kexin.hao@...driver.com> To: Jeff Garzik <jgarzik@...hat.com>, Jay Cliburn <jacliburn@...lsouth.net>, Chris Snook <csnook@...hat.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH] net: remove LLTX in atl2 driver When NETIF_F_LLTX is set, the atlx driver will use a private lock. But in recent kernels this implementation seems redundant and can cause problems where AF_PACKET sees things twice. Since NETIF_F_LLTX is marked as deprecated and shouldn't be used in new driver, this patch removes NETIF_F_LLTX and adds a mmiowb before sending packet. Signed-off-by: Kevin Hao <kexin.hao@...driver.com> --- drivers/net/atlx/atl2.c | 24 +----------------------- drivers/net/atlx/atl2.h | 1 - 2 files changed, 1 insertions(+), 24 deletions(-) diff --git a/drivers/net/atlx/atl2.c b/drivers/net/atlx/atl2.c index b2995ac..3df4ee1 100644 --- a/drivers/net/atlx/atl2.c +++ b/drivers/net/atlx/atl2.c @@ -116,7 +116,6 @@ static int __devinit atl2_sw_init(struct atl2_adapter *adapter) hw->max_frame_size = adapter->netdev->mtu; spin_lock_init(&adapter->stats_lock); - spin_lock_init(&adapter->tx_lock); set_bit(__ATL2_DOWN, &adapter->flags); @@ -749,11 +748,7 @@ static void atl2_down(struct atl2_adapter *adapter) * reschedule our watchdog timer */ set_bit(__ATL2_DOWN, &adapter->flags); -#ifdef NETIF_F_LLTX - netif_stop_queue(netdev); -#else netif_tx_disable(netdev); -#endif /* reset MAC to disable all RX/TX */ atl2_reset_hw(&adapter->hw); @@ -829,7 +824,6 @@ static inline int TxdFreeBytes(struct atl2_adapter *adapter) static int atl2_xmit_frame(struct sk_buff *skb, struct net_device *netdev) { struct atl2_adapter *adapter = netdev_priv(netdev); - unsigned long flags; struct tx_pkt_header *txph; u32 offset, copy_len; int txs_unused; @@ -845,16 +839,6 @@ static int atl2_xmit_frame(struct sk_buff *skb, struct net_device *netdev) return NETDEV_TX_OK; } -#ifdef NETIF_F_LLTX - local_irq_save(flags); - if (!spin_trylock(&adapter->tx_lock)) { - /* Collision - tell upper layer to requeue */ - local_irq_restore(flags); - return NETDEV_TX_LOCKED; - } -#else - spin_lock_irqsave(&adapter->tx_lock, flags); -#endif txs_unused = TxsFreeUnit(adapter); txbuf_unused = TxdFreeBytes(adapter); @@ -862,7 +846,6 @@ static int atl2_xmit_frame(struct sk_buff *skb, struct net_device *netdev) txs_unused < 1) { /* not enough resources */ netif_stop_queue(netdev); - spin_unlock_irqrestore(&adapter->tx_lock, flags); return NETDEV_TX_BUSY; } @@ -908,8 +891,7 @@ static int atl2_xmit_frame(struct sk_buff *skb, struct net_device *netdev) ATL2_WRITE_REGW(&adapter->hw, REG_MB_TXD_WR_IDX, (adapter->txd_write_ptr >> 2)); - spin_unlock_irqrestore(&adapter->tx_lock, flags); - + mmiowb(); netdev->trans_start = jiffies; dev_kfree_skb_any(skb); return NETDEV_TX_OK; @@ -1447,10 +1429,6 @@ static int __devinit atl2_probe(struct pci_dev *pdev, netdev->features |= (NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX); #endif -#ifdef NETIF_F_LLTX - netdev->features |= NETIF_F_LLTX; -#endif - /* Init PHY as early as possible due to power saving issue */ atl2_phy_init(&adapter->hw); diff --git a/drivers/net/atlx/atl2.h b/drivers/net/atlx/atl2.h index 6e1f28f..09974df 100644 --- a/drivers/net/atlx/atl2.h +++ b/drivers/net/atlx/atl2.h @@ -462,7 +462,6 @@ struct atl2_adapter { u16 link_duplex; spinlock_t stats_lock; - spinlock_t tx_lock; struct work_struct reset_task; struct work_struct link_chg_task; -- 1.5.6.2.220.g44701 -- 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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