netdev - [PATCH net] ice: lag: in RCU, use atomic allocation

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Date: Mon, 23 Oct 2023 12:59:53 +0200
From: Michal Schmidt <mschmidt@...hat.com>
To: netdev@...r.kernel.org
Cc: Dave Ertman <david.m.ertman@...el.com>,
	Daniel Machon <daniel.machon@...rochip.com>,
	Tony Nguyen <anthony.l.nguyen@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	intel-wired-lan@...ts.osuosl.org
Subject: [PATCH net] 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: 1e0f9881ef79 ("ice: Flesh out implementation of support for SRIOV on bonded interface")
Fixes: 41ccedf5ca8f ("ice: implement lag netdev event handler")
Fixes: 3579aa86fb40 ("ice: update reset path for SRIOV LAG support")
Signed-off-by: Michal Schmidt <mschmidt@...hat.com>
---
 drivers/net/ethernet/intel/ice/ice_lag.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_lag.c b/drivers/net/ethernet/intel/ice/ice_lag.c
index 7b1256992dcf..33f01420eece 100644
--- a/drivers/net/ethernet/intel/ice/ice_lag.c
+++ b/drivers/net/ethernet/intel/ice/ice_lag.c
@@ -595,7 +595,7 @@ 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;
 
@@ -1672,7 +1672,7 @@ 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;
 
@@ -2046,7 +2046,7 @@ 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;
 
-- 
2.41.0