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[netdrvr 8139too] fast poll for thread, if an unlikely race occurs

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The rtl8139 thread is triggered only on rare 8139 hardware, the race
itself is unlikely, and the impact of racing is low.  We don't care
enough to create a more-complex race-free solution.

Rather, if the trylock fails, we now simply poll twice a second until
we do get the lock.
This commit is contained in:
Jeff Garzik 2005-11-10 04:31:55 -05:00
parent 2f67bdb23d
commit 760559e133
1 changed files with 7 additions and 1 deletions
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8
drivers/net/8139too.c
View file

@ -1598,13 +1598,19 @@ static void rtl8139_thread (void *_data)
{
struct net_device *dev = _data;
struct rtl8139_private *tp = netdev_priv(dev);
unsigned long thr_delay;
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;
}
schedule_delayed_work(&tp->thread, next_tick);
schedule_delayed_work(&tp->thread, thr_delay);
}
static void rtl8139_start_thread(struct rtl8139_private *tp)