[PATCH net v4 2/2] net: stmmac: check if interface is running before TC block setup

[Konrad Leszczynski <konrad.leszczynski@intel.com>]

From: Karol Jurczenia <karol.jurczenia@intel.com>

If the interface is down before setting a TC block, the queues are already
disabled and setup cannot proceed.

Reviewed-by: Konrad Leszczynski <konrad.leszczynski@intel.com>
Reviewed-by: Sebastian Basierski <sebastian.basierski@intel.com>
Reviewed-by: Cezary Rojewski <cezary.rojewski@intel.com>
Signed-off-by: Karol Jurczenia <karol.jurczenia@intel.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 7b16d1207b80..133ffdc91153 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -6247,6 +6247,9 @@ static int stmmac_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
 	struct stmmac_priv *priv = cb_priv;
 	int ret = -EOPNOTSUPP;
 
+	if (!netif_running(priv->dev))
+		return -EINVAL;
+
 	if (!tc_cls_can_offload_and_chain0(priv->dev, type_data))
 		return ret;
 
-- 
2.34.1