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Commit fa701bd2 authored by Krzysztof Halasa's avatar Krzysztof Halasa Committed by Jeff Garzik
Browse files

WAN: protect HDLC proto list while insmod/rmmod 



WAN: protect protocol list in hdlc.c with RTNL.

Signed-off-by: default avatarKrzysztof Hałasa <khc@pm.waw.pl>
Signed-off-by: default avatarJeff Garzik <jgarzik@redhat.com>
parent 4ecc8c06

drivers/net/wan/hdlc.c

+11 −8
Original line number Diff line number Diff line
@@ -43,8 +43,7 @@ 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)

{
@@ -314,21 +313,25 @@ 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();

}