ice: lag: in RCU, use atomic allocation

Sleeping is not allowed in RCU read-side critical sections.
Use atomic allocations under rcu_read_lock.

Fixes: 1e0f9881 ("ice: Flesh out implementation of support for SRIOV on bonded interface")
Fixes: 41ccedf5 ("ice: implement lag netdev event handler")
Fixes: 3579aa86 ("ice: update reset path for SRIOV LAG support")
Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/ice/ice_lag.c

@@ -628,7 +628,7 @@ void ice_lag_move_new_vf_nodes(struct ice_vf *vf)
 		INIT_LIST_HEAD(&ndlist.node);
 		rcu_read_lock();
 		for_each_netdev_in_bond_rcu(lag->upper_netdev, tmp_nd) {
-			nl = kzalloc(sizeof(*nl), GFP_KERNEL);
+			nl = kzalloc(sizeof(*nl), GFP_ATOMIC);
 			if (!nl)
 				break;
 
@@ -1692,7 +1692,7 @@ ice_lag_event_handler(struct notifier_block *notif_blk, unsigned long event,
 
 		rcu_read_lock();
 		for_each_netdev_in_bond_rcu(upper_netdev, tmp_nd) {
-			nd_list = kzalloc(sizeof(*nd_list), GFP_KERNEL);
+			nd_list = kzalloc(sizeof(*nd_list), GFP_ATOMIC);
 			if (!nd_list)
 				break;
 
@@ -2069,7 +2069,7 @@ void ice_lag_rebuild(struct ice_pf *pf)
 		INIT_LIST_HEAD(&ndlist.node);
 		rcu_read_lock();
 		for_each_netdev_in_bond_rcu(lag->upper_netdev, tmp_nd) {
-			nl = kzalloc(sizeof(*nl), GFP_KERNEL);
+			nl = kzalloc(sizeof(*nl), GFP_ATOMIC);
 			if (!nl)
 				break;