[PATCH net 1/1] sfc: Ensure down_write(&filter_sem) and up_write() are matched before calling efx_net_open()

[Shradha Shah]

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

Resolves: 2d432f20d27c1813a2746008e16dd6ce12a14dc1

Signed-off-by: Shradha Shah <ss...@solarflare.com>
---
 drivers/net/ethernet/sfc/ef10_sriov.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/sfc/ef10_sriov.c 
b/drivers/net/ethernet/sfc/ef10_sriov.c
index 6c9b6e4..1798e7e 100644
--- a/drivers/net/ethernet/sfc/ef10_sriov.c
+++ b/drivers/net/ethernet/sfc/ef10_sriov.c
@@ -640,21 +640,21 @@ 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;
 
@@ -662,14 +662,16 @@ 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);
 
@@ -681,9 +683,12 @@ 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);
--
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