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8139too: fix a TX timeout watchdog thread against NAPI softirq race

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Ingo's stealth lock validator detected that both thread acquire
dev->xmit_lock and tp->rx_lock in reverse order.

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
This commit is contained in:
Francois Romieu 2006-01-31 01:04:33 +01:00 committed by Francois Romieu
parent 8351538db6
commit 371e8bc2af
1 changed files with 26 additions and 12 deletions
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38
drivers/net/8139too.c
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@ -586,6 +586,7 @@ struct rtl8139_private {
dma_addr_t tx_bufs_dma;
signed char phys[4]; /* MII device addresses. */
char twistie, twist_row, twist_col; /* Twister tune state. */
unsigned int watchdog_fired : 1;
unsigned int default_port : 4; /* Last dev->if_port value. */
unsigned int have_thread : 1;
spinlock_t lock;
@ -638,6 +639,7 @@ static void rtl8139_set_rx_mode (struct net_device *dev);
static void __set_rx_mode (struct net_device *dev);
static void rtl8139_hw_start (struct net_device *dev);
static void rtl8139_thread (void *_data);
static void rtl8139_tx_timeout_task(void *_data);
static struct ethtool_ops rtl8139_ethtool_ops;
/* write MMIO register, with flush */
@ -1598,13 +1600,14 @@ static void rtl8139_thread (void *_data)
{
struct net_device *dev = _data;
struct rtl8139_private *tp = netdev_priv(dev);
unsigned long thr_delay;
unsigned long thr_delay = next_tick;
if (rtnl_shlock_nowait() == 0) {
if (tp->watchdog_fired) {
tp->watchdog_fired = 0;
rtl8139_tx_timeout_task(_data);
} else if (rtnl_shlock_nowait() == 0) {
rtl8139_thread_iter (dev, tp, tp->mmio_addr);
rtnl_unlock ();
thr_delay = next_tick;
} else {
/* unlikely race. mitigate with fast poll. */
thr_delay = HZ / 2;
@ -1631,7 +1634,8 @@ static void rtl8139_stop_thread(struct rtl8139_private *tp)
if (tp->have_thread) {
cancel_rearming_delayed_work(&tp->thread);
tp->have_thread = 0;
}
} else
flush_scheduled_work();
}
static inline void rtl8139_tx_clear (struct rtl8139_private *tp)
@ -1642,14 +1646,13 @@ static inline void rtl8139_tx_clear (struct rtl8139_private *tp)
/* XXX account for unsent Tx packets in tp->stats.tx_dropped */
}
static void rtl8139_tx_timeout (struct net_device *dev)
static void rtl8139_tx_timeout_task (void *_data)
{
struct net_device *dev = _data;
struct rtl8139_private *tp = netdev_priv(dev);
void __iomem *ioaddr = tp->mmio_addr;
int i;
u8 tmp8;
unsigned long flags;
printk (KERN_DEBUG "%s: Transmit timeout, status %2.2x %4.4x %4.4x "
"media %2.2x.\n", dev->name, RTL_R8 (ChipCmd),
@ -1670,23 +1673,34 @@ static void rtl8139_tx_timeout (struct net_device *dev)
if (tmp8 & CmdTxEnb)
RTL_W8 (ChipCmd, CmdRxEnb);
spin_lock(&tp->rx_lock);
spin_lock_bh(&tp->rx_lock);
/* Disable interrupts by clearing the interrupt mask. */
RTL_W16 (IntrMask, 0x0000);
/* Stop a shared interrupt from scavenging while we are. */
spin_lock_irqsave (&tp->lock, flags);
spin_lock_irq(&tp->lock);
rtl8139_tx_clear (tp);
spin_unlock_irqrestore (&tp->lock, flags);
spin_unlock_irq(&tp->lock);
/* ...and finally, reset everything */
if (netif_running(dev)) {
rtl8139_hw_start (dev);
netif_wake_queue (dev);
}
spin_unlock(&tp->rx_lock);
spin_unlock_bh(&tp->rx_lock);
}
static void rtl8139_tx_timeout (struct net_device *dev)
{
struct rtl8139_private *tp = netdev_priv(dev);
if (!tp->have_thread) {
INIT_WORK(&tp->thread, rtl8139_tx_timeout_task, dev);
schedule_delayed_work(&tp->thread, next_tick);
} else
tp->watchdog_fired = 1;
}
static int rtl8139_start_xmit (struct sk_buff *skb, struct net_device *dev)
{