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8139too: RTNL and flush_scheduled_work deadlock

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Your usual dont-flush_scheduled_work-with-RTNL-held stuff.

It is a bit different here since the thread runs permanently
or is only occasionally kicked for recovery depending on the
hardware revision.

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Francois Romieu 2007-02-15 23:37:44 +01:00 committed by Jeff Garzik
parent c014f6c8f8
commit 83cbb4d257
1 changed files with 17 additions and 23 deletions
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40
drivers/net/8139too.c
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@ -1109,6 +1109,8 @@ static void __devexit rtl8139_remove_one (struct pci_dev *pdev)
assert (dev != NULL);
flush_scheduled_work();
unregister_netdev (dev);
__rtl8139_cleanup_dev (dev);
@ -1603,18 +1605,21 @@ static void rtl8139_thread (struct work_struct *work)
struct net_device *dev = tp->mii.dev;
unsigned long thr_delay = next_tick;
rtnl_lock();
if (!netif_running(dev))
goto out_unlock;
if (tp->watchdog_fired) {
tp->watchdog_fired = 0;
rtl8139_tx_timeout_task(work);
} else if (rtnl_trylock()) {
rtl8139_thread_iter (dev, tp, tp->mmio_addr);
rtnl_unlock ();
} else {
/* unlikely race. mitigate with fast poll. */
thr_delay = HZ / 2;
}
} else
rtl8139_thread_iter(dev, tp, tp->mmio_addr);
if (tp->have_thread)
schedule_delayed_work(&tp->thread, thr_delay);
out_unlock:
rtnl_unlock ();
}
static void rtl8139_start_thread(struct rtl8139_private *tp)
@ -1626,19 +1631,11 @@ static void rtl8139_start_thread(struct rtl8139_private *tp)
return;
tp->have_thread = 1;
tp->watchdog_fired = 0;
schedule_delayed_work(&tp->thread, next_tick);
}
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)
{
tp->cur_tx = 0;
@ -1696,12 +1693,11 @@ static void rtl8139_tx_timeout (struct net_device *dev)
{
struct rtl8139_private *tp = netdev_priv(dev);
if (!tp->have_thread) {
INIT_DELAYED_WORK(&tp->thread, rtl8139_tx_timeout_task);
schedule_delayed_work(&tp->thread, next_tick);
} else
tp->watchdog_fired = 1;
if (!tp->have_thread) {
INIT_DELAYED_WORK(&tp->thread, rtl8139_thread);
schedule_delayed_work(&tp->thread, next_tick);
}
}
static int rtl8139_start_xmit (struct sk_buff *skb, struct net_device *dev)
@ -2233,8 +2229,6 @@ static int rtl8139_close (struct net_device *dev)
netif_stop_queue (dev);
rtl8139_stop_thread(tp);
if (netif_msg_ifdown(tp))
printk(KERN_DEBUG "%s: Shutting down ethercard, status was 0x%4.4x.\n",
dev->name, RTL_R16 (IntrStatus));