[PATCH iwl-net v2 4/4] iavf: add VIRTCHNL_OP_ADD_VLAN to success completion handler

[Petr Oros]

The V1 ADD_VLAN opcode had no success handler; filters sent via V1
stayed in ADDING state permanently.  Add a fallthrough case so V1
filters also transition ADDING -> ACTIVE on PF confirmation.

Critically, add an `if (v_retval) break` guard: the error switch in
iavf_virtchnl_completion() does NOT return after handling errors,
it falls through to the success switch.  Without this guard, a
PF-rejected ADD would incorrectly mark ADDING filters as ACTIVE,
creating a driver/HW mismatch where the driver believes the filter
is installed but the PF never accepted it.

For V2, this is harmless: iavf_vlan_add_reject() in the error
block already kfree'd all ADDING filters, so the success handler
finds nothing to transition.

Fixes: 968996c070ef ("iavf: Fix VLAN_V2 addition/rejection")
Signed-off-by: Petr Oros <poros@xxxxxxxxxx>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@xxxxxxxxx>
Tested-by: Rafal Romanowski <rafal.romanowski@xxxxxxxxx>
---
 drivers/net/ethernet/intel/iavf/iavf_virtchnl.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
index 93ca79c3e3b535..4f2defd2331b17 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
@@ -2876,9 +2876,13 @@ void iavf_virtchnl_completion(struct iavf_adapter *adapter,
 		spin_unlock_bh(&adapter->adv_rss_lock);
 		}
 		break;
+	case VIRTCHNL_OP_ADD_VLAN:
 	case VIRTCHNL_OP_ADD_VLAN_V2: {
 		struct iavf_vlan_filter *f;
 
+		if (v_retval)
+			break;
+
 		spin_lock_bh(&adapter->mac_vlan_list_lock);
 		list_for_each_entry(f, &adapter->vlan_filter_list, list) {
 			if (f->state == IAVF_VLAN_ADDING)
-- 
2.52.0