can: fix oops caused by wrong rtnl dellink usage

commit 25e1ed6e64f52a692ba3191c4fde650aab3ecc07 upstream.

For 'real' hardware CAN devices the netlink interface is used to set CAN
specific communication parameters. Real CAN hardware can not be created nor
removed with the ip tool ...

This patch adds a private dellink function for the CAN device driver interface
that does just nothing.

It's a follow up to commit 993e6f2fd ("can: fix oops caused by wrong rtnl
newlink usage") but for dellink.

Reported-by: ajneu <ajneu1@gmail.com>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c
index f66aeb79abdf266604bfb39c94de40a5ad32f47a..464e5f66b66d1deda52d70474e78f38ad9b07c49 100644 (file)
--- a/drivers/net/can/dev.c
+++ b/drivers/net/can/dev.c
@@ -772,6 +772,11 @@ static int can_newlink(struct net *src_net, struct net_device *dev,
        return -EOPNOTSUPP;
 }
 
+static void can_dellink(struct net_device *dev, struct list_head *head)
+{
+       return;
+}
+
 static struct rtnl_link_ops can_link_ops __read_mostly = {
        .kind           = "can",
        .maxtype        = IFLA_CAN_MAX,
@@ -779,6 +784,7 @@ static struct rtnl_link_ops can_link_ops __read_mostly = {
        .setup          = can_setup,
        .newlink        = can_newlink,
        .changelink     = can_changelink,
+       .dellink        = can_dellink,
        .get_size       = can_get_size,
        .fill_info      = can_fill_info,
        .get_xstats_size = can_get_xstats_size,