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 <mikem@ring3k.org>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 61a0451..4147530 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -1880,10 +1880,6 @@
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 @@
{
struct sky2_hw *hw = sky2->hw;
unsigned port = sky2->port;
- u32 imask;
u16 ctrl;
/* Force flow control off */
@@ -1946,15 +1941,6 @@
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 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 @@
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 @@
{
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 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);
- 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;
+
+ netif_carrier_off(dev);
+ netif_tx_disable(dev);
+ sky2_hw_down(sky2);
+ }
+
+ sky2_reset(hw);
+
+ 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();
}