diff options
| author | Krzysztof Halasa <khc@pm.waw.pl> | 2008-05-19 19:00:51 +0200 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2008-05-22 12:26:32 +0200 |
| commit | fa701bd24d6e64a2283d6fa386554775fd4336e7 (patch) | |
| tree | 980f65214d2abc363b30762d6fac7b569805af47 | |
| parent | drivers/net/fs_enet: remove null pointer dereference (diff) | |
| download | linux-fa701bd24d6e64a2283d6fa386554775fd4336e7.tar.xz linux-fa701bd24d6e64a2283d6fa386554775fd4336e7.zip | |
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>
| -rw-r--r-- | drivers/net/wan/hdlc.c | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/drivers/net/wan/hdlc.c b/drivers/net/wan/hdlc.c index 9a83c9d5b8cf..7f984895b0d5 100644 --- a/drivers/net/wan/hdlc.c +++ b/drivers/net/wan/hdlc.c @@ -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(); } |