sfc: Fix post-reset MAC selection

Modify falcon_switch_mac() to always set NIC_STAT_REG, even if the the
MAC is the same as it was before.  This ensures that the value is
correct after an online reset.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/sfc/falcon.c b/drivers/net/sfc/falcon.c
index ae7b0b4..d9412f8 100644 (file)
--- a/drivers/net/sfc/falcon.c
+++ b/drivers/net/sfc/falcon.c
@@ -2283,16 +2283,12 @@ int falcon_switch_mac(struct efx_nic *efx)
                efx->link_fd = true;
        }
 
+       WARN_ON(!mutex_is_locked(&efx->mac_lock));
        efx->mac_op = (EFX_IS10G(efx) ?
                       &falcon_xmac_operations : &falcon_gmac_operations);
-       if (old_mac_op == efx->mac_op)
-               return 0;
-
-       WARN_ON(!mutex_is_locked(&efx->mac_lock));
-
-       /* Not all macs support a mac-level link state */
-       efx->mac_up = true;
 
+       /* Always push the NIC_STAT_REG setting even if the mac hasn't
+        * changed, because this function is run post online reset */
        falcon_read(efx, &nic_stat, NIC_STAT_REG);
        strap_val = EFX_IS10G(efx) ? 5 : 3;
        if (falcon_rev(efx) >= FALCON_REV_B0) {
@@ -2305,8 +2301,13 @@ int falcon_switch_mac(struct efx_nic *efx)
                BUG_ON(EFX_OWORD_FIELD(nic_stat, STRAP_PINS) != strap_val);
        }
 
+       if (old_mac_op == efx->mac_op)
+               return 0;
 
        EFX_LOG(efx, "selected %cMAC\n", EFX_IS10G(efx) ? 'X' : 'G');
+       /* Not all macs support a mac-level link state */
+       efx->mac_up = true;
+
        return falcon_reset_macs(efx);
 }