linux-kernel - Re: 2.6.23 WARNING: at kernel/softirq.c:139 local_bh

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Message-ID: <20071124181953.GI17536@waste.org>
Date:	Sat, 24 Nov 2007 12:19:53 -0600
From:	Matt Mackall <mpm@...enic.com>
To:	Simon Arlott <simon@...e.lp0.eu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Evgeniy Polyakov <johnpol@....mipt.ru>
Subject: Re: 2.6.23 WARNING: at kernel/softirq.c:139 local_bh_enable()

Simon, can you test this patch? I think it's the most straightforward
2.6.24 fix.

diff -r c60016ba6237 net/core/netpoll.c
--- a/net/core/netpoll.c	Tue Nov 13 09:09:36 2007 -0800
+++ b/net/core/netpoll.c	Fri Nov 23 13:10:28 2007 -0600
@@ -203,6 +203,12 @@ static void refill_skbs(void)
 	spin_unlock_irqrestore(&skb_pool.lock, flags);
 }
 
+/* used to mark an skb as owned by netpoll */
+static void netpoll_skb_destroy(struct sk_buff *skb)
+{
+	return;
+}
+
 static void zap_completion_queue(void)
 {
 	unsigned long flags;
@@ -219,10 +225,12 @@ static void zap_completion_queue(void)
 		while (clist != NULL) {
 			struct sk_buff *skb = clist;
 			clist = clist->next;
-			if (skb->destructor)
+			if (skb->destructor == netpoll_skb_destroy) {
+				skb->destructor = NULL;
+				__kfree_skb(skb);
+			}
+			else
 				dev_kfree_skb_any(skb); /* put this one back */
-			else
-				__kfree_skb(skb);
 		}
 	}
 
@@ -252,6 +260,7 @@ repeat:
 
 	atomic_set(&skb->users, 1);
 	skb_reserve(skb, reserve);
+	skb->destructor = netpoll_skb_destroy;
 	return skb;
 }
 

-- 
Mathematics is the supreme nostalgia of our time.
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