WAN: protect HDLC proto list while insmod/rmmod
WAN: protect protocol list in hdlc.c with RTNL. Signed-off-by: Krzysztof Hałasa <khc@pm.waw.pl> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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@ -43,8 +43,7 @@ static const char* version = "HDLC support module revision 1.22";
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#undef DEBUG_LINK
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static struct hdlc_proto *first_proto = NULL;
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static struct hdlc_proto *first_proto;
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static int hdlc_change_mtu(struct net_device *dev, int new_mtu)
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{
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@ -314,21 +313,25 @@ void detach_hdlc_protocol(struct net_device *dev)
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void register_hdlc_protocol(struct hdlc_proto *proto)
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{
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rtnl_lock();
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proto->next = first_proto;
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first_proto = proto;
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rtnl_unlock();
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}
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void unregister_hdlc_protocol(struct hdlc_proto *proto)
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{
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struct hdlc_proto **p = &first_proto;
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while (*p) {
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if (*p == proto) {
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*p = proto->next;
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return;
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}
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struct hdlc_proto **p;
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rtnl_lock();
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p = &first_proto;
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while (*p != proto) {
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BUG_ON(!*p);
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p = &((*p)->next);
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}
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*p = proto->next;
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rtnl_unlock();
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}
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