sfc: do not allow VFs to be destroyed if assigned to guests

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

diff --git a/drivers/net/ethernet/sfc/ef10_sriov.c b/drivers/net/ethernet/sfc/ef10_sriov.c
index cd524543c363aef959e1e383104ced52fb012f0a..083c534bc4ec2398662a4dace53951085eeb582e 100644 (file)
--- a/drivers/net/ethernet/sfc/ef10_sriov.c
+++ b/drivers/net/ethernet/sfc/ef10_sriov.c
@@ -417,6 +417,15 @@ static int efx_ef10_pci_sriov_disable(struct efx_nic *efx)
 {
        struct pci_dev *dev = efx->pci_dev;
 
+       if (!efx->vf_count)
+               return 0;
+
+       if (pci_vfs_assigned(dev)) {
+               netif_err(efx, drv, efx->net_dev, "VFs are assigned to guests; "
+                         "please detach them before disabling SR-IOV\n");
+               return -EBUSY;
+       }
+
        pci_disable_sriov(dev);
        efx_ef10_sriov_free_vf_vswitching(efx);
        efx->vf_count = 0;