linux-kernel - [PATCH] WAN: protect HDLC proto list while insmod/rmmod

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Message-ID: <m3ve1agrek.fsf_-_@maximus.localdomain>
Date:	Mon, 19 May 2008 19:00:51 +0200
From:	Krzysztof Halasa <khc@...waw.pl>
To:	jeff@...zik.org
Cc:	alan@...rguk.ukuu.org.uk, David Miller <davem@...emloft.net>,
	paulkf@...rogate.com, jchapman@...alix.com,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [PATCH] WAN: protect HDLC proto list while insmod/rmmod

WAN: protect protocol list in hdlc.c with RTNL.
    
Signed-off-by: Krzysztof Hałasa <khc@...waw.pl>

--- a/drivers/net/wan/hdlc.c
+++ b/drivers/net/wan/hdlc.c
@@ -42,8 +42,7 @@ static const char* version = "HDLC support module revision 1.22";
 
 #undef DEBUG_LINK
 
-static struct hdlc_proto *first_proto = NULL;
-
+static struct hdlc_proto *first_proto;
 
 static int hdlc_change_mtu(struct net_device *dev, int new_mtu)
 {
@@ -313,21 +312,25 @@ void detach_hdlc_protocol(struct net_device *dev)
 
 void register_hdlc_protocol(struct hdlc_proto *proto)
 {
+	rtnl_lock();
 	proto->next = first_proto;
 	first_proto = proto;
+	rtnl_unlock();
 }
 
 
 void unregister_hdlc_protocol(struct hdlc_proto *proto)
 {
-	struct hdlc_proto **p = &first_proto;
-	while (*p) {
-		if (*p == proto) {
-			*p = proto->next;
-			return;
-		}
+	struct hdlc_proto **p;
+
+	rtnl_lock();
+	p = &first_proto;
+	while (*p != proto) {
+		BUG_ON(!*p);
 		p = &((*p)->next);
 	}
+	*p = proto->next;
+	rtnl_unlock();
 }
 
 
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