The fragment lookup should only be performed, when
at least one of the fragment flags are set.

This change was deliberately not included in commit
68aba00483c7 ("net: sparx5: flower: fix fragment flags handling")
as it's only needed for future proffing the code, since
"mask" is currently only set in conjunction with the
fragment flags.
(The 3rd flag FLOW_DIS_ENCAPSULATION is only used with "key")

Only compile tested.

Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>
---
 drivers/net/ethernet/microchip/sparx5/sparx5_tc_flower.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_tc_flower.c b/drivers/net/ethernet/microchip/sparx5/sparx5_tc_flower.c
index 663571fe7b2d..ca9e69d39439 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_tc_flower.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_tc_flower.c
@@ -165,7 +165,7 @@ sparx5_tc_flower_handler_control_usage(struct vcap_tc_flower_parse_usage *st)
 
 	flow_rule_match_control(st->frule, &mt);
 
-	if (mt.mask->flags) {
+	if (mt.mask->flags & (FLOW_DIS_IS_FRAGMENT | FLOW_DIS_FIRST_FRAG)) {
 		u8 is_frag_key = !!(mt.key->flags & FLOW_DIS_IS_FRAGMENT);
 		u8 is_frag_mask = !!(mt.mask->flags & FLOW_DIS_IS_FRAGMENT);
 		u8 is_frag_idx = (is_frag_key << 1) | is_frag_mask;
-- 
2.43.0