1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/net/sfc/siena.c b/drivers/net/sfc/siena.c
index 727b4228e081..7ecd255a7cc0 100644
--- a/drivers/net/sfc/siena.c
+++ b/drivers/net/sfc/siena.c
@@ -206,6 +206,7 @@ static int siena_probe_nic(struct efx_nic *efx)
 {
         struct siena_nic_data *nic_data;
         bool already_attached = 0;
+        efx_oword_t reg;
         int rc;
 
         /* Allocate storage for hardware specific data */
@@ -220,6 +221,9 @@ static int siena_probe_nic(struct efx_nic *efx)
                 goto fail1;
         }
 
+        efx_reado(efx, &reg, FR_AZ_CS_DEBUG);
+        efx->port_num = EFX_OWORD_FIELD(reg, FRF_CZ_CS_PORT_NUM) - 1;
+
         efx_mcdi_init(efx);
 
         /* Recover from a failed assertion before probing */