From b03804e7c3ad41c265c0ca21ddb306b252b4f99f Mon Sep 17 00:00:00 2001 From: Ido Schimmel Date: Thu, 3 Dec 2015 12:12:03 +0100 Subject: [PATCH] net: Check CHANGEUPPER notifier return value switchdev drivers reflect the newly requested topology to hardware when CHANGEUPPER is received, after software links were already formed. However, the operation can fail and user will not be notified, as the return value of the notifier is not checked. Add this check and rollback software links if necessary. Signed-off-by: Ido Schimmel Signed-off-by: Jiri Pirko Signed-off-by: David S. Miller --- net/core/dev.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/net/core/dev.c b/net/core/dev.c index 5df6cbce727c..939cd1b1da15 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -5490,8 +5490,12 @@ static int __netdev_upper_dev_link(struct net_device *dev, goto rollback_lower_mesh; } - call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev, - &changeupper_info.info); + ret = call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev, + &changeupper_info.info); + ret = notifier_to_errno(ret); + if (ret) + goto rollback_lower_mesh; + return 0; rollback_lower_mesh: -- 2.30.2