Revert "NET: Fix locking issues in PPP, 6pack, mkiss and strip line disciplines."

This reverts commit adeab1afb7de89555c69aab5ca21300c14af6369.

As Alan Cox explained, the TTY layer changes that went recently
to get rid of the tty->low_latency stuff fixes this already,
and even for -stable it's the ->low_latency changes that should
go in to fix this, rather than this patch.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 15 insertions, 24 deletions

diff --git a/drivers/net/wireless/strip.c b/drivers/net/wireless/strip.c
index 3d39f6587eb..38366a56b71 100644
--- a/drivers/net/wireless/strip.c
+++ b/drivers/net/wireless/strip.c
@@ -856,7 +856,6 @@ static int strip_change_mtu(struct net_device *dev, int new_mtu)
 	unsigned char *orbuff = strip_info->rx_buff;
 	unsigned char *osbuff = strip_info->sx_buff;
 	unsigned char *otbuff = strip_info->tx_buff;
-	unsigned long flags;
 
 	if (new_mtu > MAX_SEND_MTU) {
 		printk(KERN_ERR
@@ -865,11 +864,11 @@ static int strip_change_mtu(struct net_device *dev, int new_mtu)
 		return -EINVAL;
 	}
 
-	spin_lock_irqsave(&strip_lock, flags);
+	spin_lock_bh(&strip_lock);
 	if (!allocate_buffers(strip_info, new_mtu)) {
 		printk(KERN_ERR "%s: unable to grow strip buffers, MTU change cancelled.\n",
 		       strip_info->dev->name);
-		spin_unlock_irqrestore(&strip_lock, flags);
+		spin_unlock_bh(&strip_lock);
 		return -ENOMEM;
 	}
 
@@ -893,7 +892,7 @@ static int strip_change_mtu(struct net_device *dev, int new_mtu)
 		}
 	}
 	strip_info->tx_head = strip_info->tx_buff;
-	spin_unlock_irqrestore(&strip_lock, flags);
+	spin_unlock_bh(&strip_lock);
 
 	printk(KERN_NOTICE "%s: strip MTU changed fom %d to %d.\n",
 	       strip_info->dev->name, old_mtu, strip_info->mtu);
@@ -984,13 +983,10 @@ static void strip_seq_neighbours(struct seq_file *seq,
 			   const MetricomNodeTable * table,
 			   const char *title)
 {
-	unsigned long flags;
+	/* We wrap this in a do/while loop, so if the table changes */
+	/* while we're reading it, we just go around and try again. */
 	struct timeval t;
 
-	/*
-	 * We wrap this in a do/while loop, so if the table changes
-	 * while we're reading it, we just go around and try again.
-	 */
 	do {
 		int i;
 		t = table->timestamp;
@@ -999,9 +995,9 @@ static void strip_seq_neighbours(struct seq_file *seq,
 		for (i = 0; i < table->num_nodes; i++) {
 			MetricomNode node;
 
-			spin_lock_irqsave(&strip_lock, flags);
+			spin_lock_bh(&strip_lock);
 			node = table->node[i];
-			spin_unlock_irqrestore(&strip_lock, flags);
+			spin_unlock_bh(&strip_lock);
 			seq_printf(seq, "  %s\n", node.c);
 		}
 	} while (table->timestamp.tv_sec != t.tv_sec
@@ -1540,7 +1536,6 @@ static void strip_send(struct strip *strip_info, struct sk_buff *skb)
 static int strip_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	struct strip *strip_info = netdev_priv(dev);
-	unsigned long flags;
 
 	if (!netif_running(dev)) {
 		printk(KERN_ERR "%s: xmit call when iface is down\n",
@@ -1579,11 +1574,11 @@ static int strip_xmit(struct sk_buff *skb, struct net_device *dev)
 			       strip_info->dev->name, sx_pps_count / 8);
 	}
 
-	spin_lock_irqsave(&strip_lock, flags);
+	spin_lock_bh(&strip_lock);
 
 	strip_send(strip_info, skb);
 
-	spin_unlock_irqrestore(&strip_lock, flags);
+	spin_unlock_bh(&strip_lock);
 
 	if (skb)
 		dev_kfree_skb(skb);
@@ -2268,13 +2263,12 @@ static void strip_receive_buf(struct tty_struct *tty, const unsigned char *cp,
 {
 	struct strip *strip_info = tty->disc_data;
 	const unsigned char *end = cp + count;
-	unsigned long flags;
 
 	if (!strip_info || strip_info->magic != STRIP_MAGIC
 	    || !netif_running(strip_info->dev))
 		return;
 
-	spin_lock_irqsave(&strip_lock, flags);
+	spin_lock_bh(&strip_lock);
 #if 0
 	{
 		struct timeval tv;
@@ -2341,7 +2335,7 @@ static void strip_receive_buf(struct tty_struct *tty, const unsigned char *cp,
 		}
 		cp++;
 	}
-	spin_unlock_irqrestore(&strip_lock, flags);
+	spin_unlock_bh(&strip_lock);
 }
 
 
@@ -2529,11 +2523,9 @@ static void strip_dev_setup(struct net_device *dev)
 
 static void strip_free(struct strip *strip_info)
 {
-	unsigned long flags;
-
-	spin_lock_irqsave(&strip_lock, flags);
+	spin_lock_bh(&strip_lock);
 	list_del_rcu(&strip_info->list);
-	spin_unlock_irqrestore(&strip_lock, flags);
+	spin_unlock_bh(&strip_lock);
 
 	strip_info->magic = 0;
 
@@ -2547,7 +2539,6 @@ static void strip_free(struct strip *strip_info)
 static struct strip *strip_alloc(void)
 {
 	struct list_head *n;
-	unsigned long flags;
 	struct net_device *dev;
 	struct strip *strip_info;
 
@@ -2571,7 +2562,7 @@ static struct strip *strip_alloc(void)
 	strip_info->idle_timer.function = strip_IdleTask;
 
 
-	spin_lock_irqsave(&strip_lock, flags);
+	spin_lock_bh(&strip_lock);
  rescan:
 	/*
 	 * Search the list to find where to put our new entry
@@ -2590,7 +2581,7 @@ static struct strip *strip_alloc(void)
 	sprintf(dev->name, "st%ld", dev->base_addr);
 
 	list_add_tail_rcu(&strip_info->list, &strip_list);
-	spin_unlock_irqrestore(&strip_lock, flags);
+	spin_unlock_bh(&strip_lock);
 
 	return strip_info;
 }