sfc: Ensure down_write(&filter_sem) and up_write() are matched before calling efx_net_open()

This patch avoids the double up_write to filter_sem if
efx_net_open() fails.

Resolves: 2d432f20d27c1813a2746008e16dd6ce12a14dc1

Signed-off-by: Shradha Shah <sshah@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 6 deletions

diff --git a/drivers/net/ethernet/sfc/ef10_sriov.c b/drivers/net/ethernet/sfc/ef10_sriov.c
index 7485f71b4e2f..3c17f274e802 100644
--- a/drivers/net/ethernet/sfc/ef10_sriov.c
+++ b/drivers/net/ethernet/sfc/ef10_sriov.c
@@ -598,21 +598,21 @@ int efx_ef10_sriov_set_vf_vlan(struct efx_nic *efx, int vf_i, u16 vlan,
                                   MC_CMD_VPORT_ALLOC_IN_VPORT_TYPE_NORMAL,
                                   vf->vlan, &vf->vport_id);
         if (rc)
-                goto reset_nic;
+                goto reset_nic_up_write;
 
 restore_mac:
         if (!is_zero_ether_addr(vf->mac)) {
                 rc2 = efx_ef10_vport_add_mac(efx, vf->vport_id, vf->mac);
                 if (rc2) {
                         eth_zero_addr(vf->mac);
-                        goto reset_nic;
+                        goto reset_nic_up_write;
                 }
         }
 
 restore_evb_port:
         rc2 = efx_ef10_evb_port_assign(efx, vf->vport_id, vf_i);
         if (rc2)
-                goto reset_nic;
+                goto reset_nic_up_write;
         else
                 vf->vport_assigned = 1;
 
@@ -620,14 +620,16 @@ restore_vadaptor:
         if (vf->efx) {
                 rc2 = efx_ef10_vadaptor_alloc(vf->efx, EVB_PORT_ID_ASSIGNED);
                 if (rc2)
-                        goto reset_nic;
+                        goto reset_nic_up_write;
         }
 
 restore_filters:
         if (vf->efx) {
                 rc2 = vf->efx->type->filter_table_probe(vf->efx);
                 if (rc2)
-                        goto reset_nic;
+                        goto reset_nic_up_write;
+
+                up_write(&vf->efx->filter_sem);
 
                 up_write(&vf->efx->filter_sem);
 
@@ -639,9 +641,12 @@ restore_filters:
         }
         return rc;
 
+reset_nic_up_write:
+        if (vf->efx)
+                up_write(&vf->efx->filter_sem);
+
 reset_nic:
         if (vf->efx) {
-                up_write(&vf->efx->filter_sem);
                 netif_err(efx, drv, efx->net_dev,
                           "Failed to restore VF - scheduling reset.\n");
                 efx_schedule_reset(vf->efx, RESET_TYPE_DATAPATH);