[PATCH AUTOSEL 4.14 232/371] net/af_iucv: always register net_device notifier
From: Sasha Levin <sashal@kernel.org>
Date: 2020-01-16 18:20:33
Also in:
linux-s390, lkml, stable
Subsystem:
networking [general], s390 iucv network layer, the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Alexandra Winter, Thorsten Winkler, Linus Torvalds
From: Julian Wiedmann <redacted>
[ Upstream commit 06996c1d4088a0d5f3e7789d7f96b4653cc947cc ]
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: 9fbd87d41392 ("af_iucv: handle netdev events")
Signed-off-by: Julian Wiedmann <redacted>
Reviewed-by: Ursula Braun <redacted>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/iucv/af_iucv.c | 27 ++++++++++++++++++++-------
1 file changed, 20 insertions(+), 7 deletions(-)
diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index ca98276c2709..7a9cbc9502d9 100644
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c@@ -2446,6 +2446,13 @@ static int afiucv_iucv_init(void) 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 @@ static int __init afiucv_init(void) 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);
--
2.20.1