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net: airoha: Fix schedule while atomic in airoha_ppe_deinit()

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airoha_ppe_deinit() runs airoha_npu_ppe_deinit() in atomic context.
airoha_npu_ppe_deinit routine allocates ppe_data buffer with GFP_KERNEL
flag. Rely on rcu_replace_pointer in airoha_ppe_deinit routine in order
to fix schedule while atomic issue in airoha_npu_ppe_deinit() since we
do not need atomic context there.

Fixes: 00a7678310 ("net: airoha: Introduce flowtable offload support")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://patch.msgid.link/20260105-airoha-fw-ethtool-v2-1-3b32b158cc31@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Lorenzo Bianconi 2026-01-05 09:43:31 +01:00 committed by Paolo Abeni
parent 653267321f
commit 6abcf751bc
1 changed files with 6 additions and 3 deletions
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9
drivers/net/ethernet/airoha/airoha_ppe.c
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@ -1547,13 +1547,16 @@ void airoha_ppe_deinit(struct airoha_eth *eth)
{ {
struct airoha_npu *npu; struct airoha_npu *npu;
rcu_read_lock(); mutex_lock(&flow_offload_mutex);
npu = rcu_dereference(eth->npu);
npu = rcu_replace_pointer(eth->npu, NULL,
lockdep_is_held(&flow_offload_mutex));
if (npu) { if (npu) {
npu->ops.ppe_deinit(npu); npu->ops.ppe_deinit(npu);
airoha_npu_put(npu); airoha_npu_put(npu);
} }
rcu_read_unlock();
mutex_unlock(&flow_offload_mutex);
rhashtable_destroy(&eth->ppe->l2_flows); rhashtable_destroy(&eth->ppe->l2_flows);
rhashtable_destroy(&eth->flow_table); rhashtable_destroy(&eth->flow_table);