From 8a0c9228f110218f443d9ef8f9ab629251959733 Mon Sep 17 00:00:00 2001 From: Mike McCormack Date: Fri, 12 Feb 2010 06:58:06 +0000 Subject: sky2: Avoid down and up during sky2_reset Rewrite sky2_reset to work with interrupts disabled and avoid freeing and reallocing memory. The old code used sky2_down and sky2_up to implement sky2_reset, which meant interrupts could not be disabled, and the transmit and receive ring buffers would be free'd and reallocated. To avoid the interrupt handler waking the transmit queue while we're doing a reset, it's better to have interrupts and NAPI polls disabled. Note: Modified Mike's patch to do IRQ disable in sky2_down before calling sky2_hw_down - Stephen Signed-off-by: Mike McCormack Acked-by: Stephen Hemminger Signed-off-by: David S. Miller --- drivers/net/sky2.c | 68 +++++++++++++++++++++++++++++++++++++----------------- 1 file changed, 47 insertions(+), 21 deletions(-) (limited to 'drivers') diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c index 61a0451957b0..4147530cee02 100644 --- a/drivers/net/sky2.c +++ b/drivers/net/sky2.c @@ -1880,10 +1880,6 @@ static void sky2_tx_complete(struct sky2_port *sky2, u16 done) sky2->tx_cons = idx; smp_mb(); - - /* Wake unless it's detached, and called e.g. from sky2_down() */ - if (tx_avail(sky2) > MAX_SKB_TX_LE + 4 && netif_device_present(dev)) - netif_wake_queue(dev); } static void sky2_tx_reset(struct sky2_hw *hw, unsigned port) @@ -1912,7 +1908,6 @@ static void sky2_hw_down(struct sky2_port *sky2) { struct sky2_hw *hw = sky2->hw; unsigned port = sky2->port; - u32 imask; u16 ctrl; /* Force flow control off */ @@ -1946,15 +1941,6 @@ static void sky2_hw_down(struct sky2_port *sky2) sky2_rx_stop(sky2); - /* Disable port IRQ */ - imask = sky2_read32(hw, B0_IMSK); - imask &= ~portirq_msk[port]; - sky2_write32(hw, B0_IMSK, imask); - sky2_read32(hw, B0_IMSK); - - synchronize_irq(hw->pdev->irq); - napi_synchronize(&hw->napi); - spin_lock_bh(&sky2->phy_lock); sky2_phy_power_down(hw, port); spin_unlock_bh(&sky2->phy_lock); @@ -1969,6 +1955,7 @@ static void sky2_hw_down(struct sky2_port *sky2) static int sky2_down(struct net_device *dev) { struct sky2_port *sky2 = netdev_priv(dev); + struct sky2_hw *hw = sky2->hw; /* Never really got started! */ if (!sky2->tx_le) @@ -1977,6 +1964,14 @@ static int sky2_down(struct net_device *dev) if (netif_msg_ifdown(sky2)) printk(KERN_INFO PFX "%s: disabling interface\n", dev->name); + /* Disable port IRQ */ + sky2_write32(hw, B0_IMSK, + sky2_read32(hw, B0_IMSK) & ~portirq_msk[sky2->port]); + sky2_read32(hw, B0_IMSK); + + synchronize_irq(hw->pdev->irq); + napi_synchronize(&hw->napi); + sky2_hw_down(sky2); sky2_free_buffers(sky2); @@ -2475,8 +2470,13 @@ static inline void sky2_tx_done(struct net_device *dev, u16 last) { struct sky2_port *sky2 = netdev_priv(dev); - if (netif_running(dev)) + if (netif_running(dev)) { sky2_tx_complete(sky2, last); + + /* Wake unless it's detached, and called e.g. from sky2_down() */ + if (tx_avail(sky2) > MAX_SKB_TX_LE + 4) + netif_wake_queue(dev); + } } static inline void sky2_skb_rx(const struct sky2_port *sky2, @@ -3277,20 +3277,46 @@ static int sky2_reattach(struct net_device *dev) static void sky2_restart(struct work_struct *work) { struct sky2_hw *hw = container_of(work, struct sky2_hw, restart_work); + u32 imask; int i; rtnl_lock(); - for (i = 0; i < hw->ports; i++) - sky2_detach(hw->dev[i]); napi_disable(&hw->napi); + synchronize_irq(hw->pdev->irq); + imask = sky2_read32(hw, B0_IMSK); sky2_write32(hw, B0_IMSK, 0); + + for (i = 0; i < hw->ports; i++) { + struct net_device *dev = hw->dev[i]; + struct sky2_port *sky2 = netdev_priv(dev); + + if (!netif_running(dev)) + continue; + + netif_carrier_off(dev); + netif_tx_disable(dev); + sky2_hw_down(sky2); + } + sky2_reset(hw); - sky2_write32(hw, B0_IMSK, Y2_IS_BASE); - napi_enable(&hw->napi); - for (i = 0; i < hw->ports; i++) - sky2_reattach(hw->dev[i]); + for (i = 0; i < hw->ports; i++) { + struct net_device *dev = hw->dev[i]; + struct sky2_port *sky2 = netdev_priv(dev); + + if (!netif_running(dev)) + continue; + + sky2_hw_up(sky2); + netif_wake_queue(dev); + } + + sky2_write32(hw, B0_IMSK, imask); + sky2_read32(hw, B0_IMSK); + + sky2_read32(hw, B0_Y2_SP_LISR); + napi_enable(&hw->napi); rtnl_unlock(); } -- cgit v1.2.2