[PATCH net] net: airoha: Fix schedule while atomic in airoha_ppe_deinit()

Lorenzo Bianconi
2025-12-23T21:57:19Z

Rely on rcu_replace_pointer in airoha_ppe_deinit routine in order to fix
schedule while atomic issue.

Fixes: 00a7678310fe3 ("net: airoha: Introduce flowtable offload support")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
drivers/net/ethernet/airoha/airoha_ppe.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/airoha/airoha_ppe.c b/drivers/net/ethernet/airoha/airoha_ppe.c
index 0caabb0c3aa06948e46ad087c50eba5babc81994..2221bafaf7c9fed73dcf8d30ff3b1c5eecc463d4 100644
--- a/drivers/net/ethernet/airoha/airoha_ppe.c
+++ b/drivers/net/ethernet/airoha/airoha_ppe.c
@@ -1547,13 +1547,16 @@ void airoha_ppe_deinit(struct airoha_eth *eth)
{
struct airoha_npu *npu;

- rcu_read_lock();
- npu = rcu_dereference(eth->npu);
+ mutex_lock(&flow_offload_mutex);
+
+ npu = rcu_replace_pointer(eth->npu, NULL,
+ lockdep_is_held(&flow_offload_mutex));
if (npu) {
npu->ops.ppe_deinit(npu);
airoha_npu_put(npu);
}
- rcu_read_unlock();
+
+ mutex_unlock(&flow_offload_mutex);

rhashtable_destroy(&eth->ppe->l2_flows);
rhashtable_destroy(&eth->flow_table);

---
base-commit: 7b8e9264f55a9c320f398e337d215e68cca50131
change-id: 20251223-airoha-fw-ethtool-21f54b02c98b

Best regards,
--
Lorenzo Bianconi <lorenzo@kernel.org>