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r8169: bh locking redux and task scheduling. 

- atomic bit operations are globally visible
- pending status is always cleared before execution
- scheduled works are either idempotent or only required to happen once
  after a series of originating events, say link events for instance

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Suggested-by: Michał Mirosław <mirqus@gmail.com>
Cc: Hayes Wang <hayeswang@realtek.com>
This commit is contained in:
Francois Romieu 2012-01-31 10:47:34 +01:00
parent ae1f23fb43
commit 98ddf986fc
1 changed files with 4 additions and 16 deletions
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20
drivers/net/ethernet/realtek/r8169.c
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@ -3273,17 +3273,8 @@ out_mod_timer:
static void rtl_schedule_task(struct rtl8169_private *tp, enum rtl_flag flag)
{
spin_lock(&tp->lock);
if (!test_and_set_bit(flag, tp->wk.flags))
schedule_work(&tp->wk.work);
spin_unlock(&tp->lock);
}
static void rtl_schedule_task_bh(struct rtl8169_private *tp, enum rtl_flag flag)
{
local_bh_disable();
rtl_schedule_task(tp, flag);
local_bh_enable();
}
static void rtl8169_phy_timer(unsigned long __opaque)
@ -3291,7 +3282,7 @@ static void rtl8169_phy_timer(unsigned long __opaque)
struct net_device *dev = (struct net_device *)__opaque;
struct rtl8169_private *tp = netdev_priv(dev);
rtl_schedule_task_bh(tp, RTL_FLAG_TASK_PHY_PENDING);
rtl_schedule_task(tp, RTL_FLAG_TASK_PHY_PENDING);
}
#ifdef CONFIG_NET_POLL_CONTROLLER
@ -5635,7 +5626,7 @@ static void rtl8169_pcierr_interrupt(struct net_device *dev)
rtl8169_hw_reset(tp);
rtl_schedule_task_bh(tp, RTL_FLAG_TASK_RESET_PENDING);
rtl_schedule_task(tp, RTL_FLAG_TASK_RESET_PENDING);
}
static void rtl_tx(struct net_device *dev, struct rtl8169_private *tp)
@ -5852,7 +5843,7 @@ static void rtl_slow_event_work(struct rtl8169_private *tp)
/* Work around for rx fifo overflow */
case RTL_GIGA_MAC_VER_11:
netif_stop_queue(dev);
rtl_schedule_task_bh(tp, RTL_FLAG_TASK_RESET_PENDING);
rtl_schedule_task(tp, RTL_FLAG_TASK_RESET_PENDING);
default:
break;
}
@ -5894,10 +5885,7 @@ static void rtl_task(struct work_struct *work)
for (i = 0; i < ARRAY_SIZE(rtl_work); i++) {
bool pending;
spin_lock_bh(&tp->lock);
pending = test_and_clear_bit(rtl_work[i].bitnr, tp->wk.flags);
spin_unlock_bh(&tp->lock);
if (pending)
rtl_work[i].action(tp);
}
@ -6116,7 +6104,7 @@ static void __rtl8169_resume(struct net_device *dev)
tp->wk.enabled = true;
rtl_schedule_task_bh(tp, RTL_FLAG_TASK_RESET_PENDING);
rtl_schedule_task(tp, RTL_FLAG_TASK_RESET_PENDING);
}
static int rtl8169_resume(struct device *device)