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net/af_iucv: always register net_device notifier 

[ Upstream commit 06996c1d40 ]

Even when running as VM guest (ie pr_iucv != NULL), af_iucv can still
open HiperTransport-based connections. For robust operation these
connections require the af_iucv_netdev_notifier, so register it
unconditionally.

Also handle any error that register_netdevice_notifier() returns.

Fixes: 9fbd87d413 ("af_iucv: handle netdev events")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Julian Wiedmann 2019-06-18 20:43:01 +02:00 committed by Greg Kroah-Hartman
parent 9085504b3b
commit b6668f5207
1 changed files with 20 additions and 7 deletions
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27
net/iucv/af_iucv.c
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@ -2446,6 +2446,13 @@ out:
return err;
}
static void afiucv_iucv_exit(void)
{
device_unregister(af_iucv_dev);
driver_unregister(&af_iucv_driver);
pr_iucv->iucv_unregister(&af_iucv_handler, 0);
}
static int __init afiucv_init(void)
{
int err;
@ -2479,11 +2486,18 @@ static int __init afiucv_init(void)
err = afiucv_iucv_init();
if (err)
goto out_sock;
} else
register_netdevice_notifier(&afiucv_netdev_notifier);
}
err = register_netdevice_notifier(&afiucv_netdev_notifier);
if (err)
goto out_notifier;
dev_add_pack(&iucv_packet_type);
return 0;
out_notifier:
if (pr_iucv)
afiucv_iucv_exit();
out_sock:
sock_unregister(PF_IUCV);
out_proto:
@ -2497,12 +2511,11 @@ out:
static void __exit afiucv_exit(void)
{
if (pr_iucv) {
device_unregister(af_iucv_dev);
driver_unregister(&af_iucv_driver);
pr_iucv->iucv_unregister(&af_iucv_handler, 0);
afiucv_iucv_exit();
symbol_put(iucv_if);
} else
unregister_netdevice_notifier(&afiucv_netdev_notifier);
}
unregister_netdevice_notifier(&afiucv_netdev_notifier);
dev_remove_pack(&iucv_packet_type);
sock_unregister(PF_IUCV);
proto_unregister(&iucv_proto);