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Commit f6caa14a authored by Mike McCormack's avatar Mike McCormack Committed by David S. Miller
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sky2: Avoid transmits during sky2_down() 



This patch supersedes my previous patch "sky2: Avoid transmitting
during sky2_restart".

I have reworked the patch to avoid crashes during both sky2_restart()
and sky2_set_ringparam().

Without this patch, the sky2 driver can be crashed by doing:

# pktgen eth1 &    (transmit many packets on eth1)
# ethtool -G eth1 tx 510

I am aware you object to storing extra state, but I can't see a way
around this. Without remembering that we're restarting,
netif_wake_queue() is called in the ISR from sky2_tx_complete(), and
netif_tx_lock() is used in sky2_tx_done().  If anybody can see a way
around this, please let me know.

Signed-off-by: default avatarMike McCormack <mikem@ring3k.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 202ff1ec

drivers/net/sky2.c

+13 −1
Original line number Diff line number Diff line
@@ -1488,6 +1488,8 @@ static int sky2_up(struct net_device *dev) 
	sky2_set_vlan_mode(hw, port, sky2->vlgrp != NULL);

#endif



	sky2->restarting = 0;



	err = sky2_rx_start(sky2);

	if (err)

		goto err_out;
@@ -1500,6 +1502,9 @@ static int sky2_up(struct net_device *dev) 


	sky2_set_multicast(dev);



	/* wake queue incase we are restarting */

	netif_wake_queue(dev);



	if (netif_msg_ifup(sky2))

		printk(KERN_INFO PFX "%s: enabling interface\n", dev->name);

	return 0;
@@ -1533,6 +1538,8 @@ static inline int tx_dist(unsigned tail, unsigned head) 
/* Number of list elements available for next tx */

static inline int tx_avail(const struct sky2_port *sky2)

{

	if (unlikely(sky2->restarting))

		return 0;

	return sky2->tx_pending - tx_dist(sky2->tx_cons, sky2->tx_prod);

}
@@ -1818,6 +1825,10 @@ static int sky2_down(struct net_device *dev) 
	if (netif_msg_ifdown(sky2))

		printk(KERN_INFO PFX "%s: disabling interface\n", dev->name);



	/* explicitly shut off tx incase we're restarting */

	sky2->restarting = 1;

	netif_tx_disable(dev);



	/* Force flow control off */

	sky2_write8(hw, SK_REG(port, GMAC_CTRL), GMC_PAUSE_OFF);
@@ -2359,7 +2370,7 @@ static inline void sky2_tx_done(struct net_device *dev, u16 last) 
{

	struct sky2_port *sky2 = netdev_priv(dev);



	if (netif_running(dev)) {

	if (likely(netif_running(dev) && !sky2->restarting)) {

		netif_tx_lock(dev);

		sky2_tx_complete(sky2, last);

		netif_tx_unlock(dev);
@@ -4283,6 +4294,7 @@ static __devinit struct net_device *sky2_init_netdev(struct sky2_hw *hw, 
	spin_lock_init(&sky2->phy_lock);

	sky2->tx_pending = TX_DEF_PENDING;

	sky2->rx_pending = RX_DEF_PENDING;

	sky2->restarting = 0;



	hw->dev[port] = dev;

drivers/net/sky2.h

+1 −0
Original line number Diff line number Diff line
@@ -2051,6 +2051,7 @@ struct sky2_port { 
	u8		     duplex;	/* DUPLEX_HALF, DUPLEX_FULL */

	u8		     rx_csum;

	u8		     wol;

	u8		     restarting;

 	enum flow_control    flow_mode;

 	enum flow_control    flow_status;