From: Francois Romieu <romieu@fr.zoreil.com>
Date: Tue, 31 Jan 2012 09:47:34 +0000 (+0100)
Subject: r8169: bh locking redux and task scheduling.
X-Git-Tag: v2.6.39-400.9.0~423^2~19^2~11^2~17
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=811a4d89b69dc9a9474fbc93b23d18ee999ae48a;p=users%2Fjedix%2Flinux-maple.git

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

(cherry picked from commit 98ddf986fca17840e46e070354b7e2cd2169da15)
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Suggested-by: Michał Mirosław <mirqus@gmail.com>
Cc: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: Joe Jin <joe.jin@oracle.com>
---

diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index de29b56265a3..07fdfc3e8ea8 100644
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -3271,17 +3271,8 @@ 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)
@@ -3289,7 +3280,7 @@ 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
@@ -5633,7 +5624,7 @@ 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)
@@ -5850,7 +5841,7 @@ 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;
 		}
@@ -5892,10 +5883,7 @@ 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);
 	}
@@ -6114,7 +6102,7 @@ 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)