This is a note to let you know that I've just added the patch titled ice: Respond to a NETDEV_UNREGISTER event for LAG to the 5.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ice-respond-to-a-netdev_unregister-event-for-lag.patch and it can be found in the queue-5.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 6a8b357278f5f8b9817147277ab8f12879dce8a8 Mon Sep 17 00:00:00 2001 From: Dave Ertman <david.m.ertman@xxxxxxxxx> Date: Thu, 7 Oct 2021 08:40:31 -0700 Subject: ice: Respond to a NETDEV_UNREGISTER event for LAG From: Dave Ertman <david.m.ertman@xxxxxxxxx> commit 6a8b357278f5f8b9817147277ab8f12879dce8a8 upstream. When the PF is a member of a link aggregate, and the driver is removed, the process will hang unless we respond to the NETDEV_UNREGISTER event that is sent to the event_handler for LAG. Add a case statement for the ice_lag_event_handler to unlink the PF from the link aggregate. Also remove code that was incorrectly applying a dev_hold to peer_netdevs that were associated with the ice driver. Fixes: df006dd4b1dc ("ice: Add initial support framework for LAG") Signed-off-by: Dave Ertman <david.m.ertman@xxxxxxxxx> Tested-by: Tony Brelinski <tony.brelinski@xxxxxxxxx> Signed-off-by: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/net/ethernet/intel/ice/ice_lag.c | 18 ++++-------------- 1 file changed, 4 insertions(+), 14 deletions(-) --- a/drivers/net/ethernet/intel/ice/ice_lag.c +++ b/drivers/net/ethernet/intel/ice/ice_lag.c @@ -100,9 +100,9 @@ static void ice_display_lag_info(struct */ static void ice_lag_info_event(struct ice_lag *lag, void *ptr) { - struct net_device *event_netdev, *netdev_tmp; struct netdev_notifier_bonding_info *info; struct netdev_bonding_info *bonding_info; + struct net_device *event_netdev; const char *lag_netdev_name; event_netdev = netdev_notifier_info_to_dev(ptr); @@ -123,19 +123,6 @@ static void ice_lag_info_event(struct ic goto lag_out; } - rcu_read_lock(); - for_each_netdev_in_bond_rcu(lag->upper_netdev, netdev_tmp) { - if (!netif_is_ice(netdev_tmp)) - continue; - - if (netdev_tmp && netdev_tmp != lag->netdev && - lag->peer_netdev != netdev_tmp) { - dev_hold(netdev_tmp); - lag->peer_netdev = netdev_tmp; - } - } - rcu_read_unlock(); - if (bonding_info->slave.state) ice_lag_set_backup(lag); else @@ -319,6 +306,9 @@ ice_lag_event_handler(struct notifier_bl case NETDEV_BONDING_INFO: ice_lag_info_event(lag, ptr); break; + case NETDEV_UNREGISTER: + ice_lag_unlink(lag, ptr); + break; default: break; } Patches currently in stable-queue which might be from david.m.ertman@xxxxxxxxx are queue-5.14/ice-respond-to-a-netdev_unregister-event-for-lag.patch