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r8169: RTNL and flush_scheduled_work deadlock 

flush_scheduled_work() in net_device->close has a slight tendency
to deadlock with tasks on the workqueue that hold RTNL.

rtl8169_close/down simply need the recovery tasks to not meddle
with the hardware while the device is going down.

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 23:37:21 +01:00 committed by Jeff Garzik
parent 1ca9492992
commit eb2a021c47
1 changed files with 18 additions and 7 deletions
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25
drivers/net/r8169.c
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@ -1733,6 +1733,8 @@ rtl8169_remove_one(struct pci_dev *pdev)
assert(dev != NULL);
assert(tp != NULL);
flush_scheduled_work();
unregister_netdev(dev);
rtl8169_release_board(pdev, dev, tp->mmio_addr);
pci_set_drvdata(pdev, NULL);
@ -2161,10 +2163,13 @@ static void rtl8169_reinit_task(struct work_struct *work)
struct net_device *dev = tp->dev;
int ret;
if (netif_running(dev)) {
rtl8169_wait_for_quiescence(dev);
rtl8169_close(dev);
}
rtnl_lock();
if (!netif_running(dev))
goto out_unlock;
rtl8169_wait_for_quiescence(dev);
rtl8169_close(dev);
ret = rtl8169_open(dev);
if (unlikely(ret < 0)) {
@ -2179,6 +2184,9 @@ static void rtl8169_reinit_task(struct work_struct *work)
}
rtl8169_schedule_work(dev, rtl8169_reinit_task);
}
out_unlock:
rtnl_unlock();
}
static void rtl8169_reset_task(struct work_struct *work)
@ -2187,8 +2195,10 @@ static void rtl8169_reset_task(struct work_struct *work)
container_of(work, struct rtl8169_private, task.work);
struct net_device *dev = tp->dev;
rtnl_lock();
if (!netif_running(dev))
return;
goto out_unlock;
rtl8169_wait_for_quiescence(dev);
@ -2210,6 +2220,9 @@ static void rtl8169_reset_task(struct work_struct *work)
}
rtl8169_schedule_work(dev, rtl8169_reset_task);
}
out_unlock:
rtnl_unlock();
}
static void rtl8169_tx_timeout(struct net_device *dev)
@ -2722,8 +2735,6 @@ static void rtl8169_down(struct net_device *dev)
netif_stop_queue(dev);
flush_scheduled_work();
core_down:
spin_lock_irq(&tp->lock);