[PATCH iwl-net v2 5/5] iavf: return 0 when TC flower filter not found after qdisc teardown

[Aleksandr Loktionov <aleksandr.loktionov@intel.com>]

From: Kiran Patil <kiran.patil@intel.com>

When an egress qdisc is destroyed, the driver proactively deletes all
associated cloud filters to prevent stale hardware state, decrementing
num_cloud_filters to zero in the process.

The kernel netdev layer is unaware of this implicit cleanup and may
still try to delete the same filters individually. If the filter is
not found in the driver's list and num_cloud_filters is already zero,
return 0 instead of -EINVAL to avoid confusing upper layers that
believe the filter is still offloaded in hardware.

Fixes: 0075fa0fadd0 ("i40evf: Add support to apply cloud filters")
Cc: stable@vger.kernel.org
Signed-off-by: Kiran Patil <kiran.patil@intel.com>
Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
---
 drivers/net/ethernet/intel/iavf/iavf_main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index e5bf15b..de80947 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -4162,7 +4162,8 @@ static int iavf_delete_clsflower(struct iavf_adapter *adapter,
 	if (filter) {
 		filter->del = true;
 		adapter->aq_required |= IAVF_FLAG_AQ_DEL_CLOUD_FILTER;
-	} else {
+	} else if (adapter->num_cloud_filters) {
+		/* other filters still tracked, so this one is a genuine miss */
 		err = -EINVAL;
 	}
 	spin_unlock_bh(&adapter->cloud_filter_list_lock);
-- 
2.52.0