[patch net 2/2] mlxsw: spectrum_router: Fix rif counter freeing routine

[Jiri Pirko]

From: Arkadi Sharshevsky <arka...@mellanox.com>

During rif counter freeing the counter index can be invalid. Add check
of validity before freeing the counter.

Fixes: e0c0afd8aa4e ("mlxsw: spectrum: Support for counters on router 
interfaces")
Signed-off-by: Arkadi Sharshevsky <arka...@mellanox.com>
Signed-off-by: Jiri Pirko <j...@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c 
b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 33cec1c..9f89c41 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -206,6 +206,9 @@ void mlxsw_sp_rif_counter_free(struct mlxsw_sp *mlxsw_sp,
 {
        unsigned int *p_counter_index;
 
+       if (!mlxsw_sp_rif_counter_valid_get(rif, dir))
+               return;
+
        p_counter_index = mlxsw_sp_rif_p_counter_get(rif, dir);
        if (WARN_ON(!p_counter_index))
                return;
-- 
2.9.3