qlcnic: Do not disable SR-IOV when VFs are assigned to VMs

o While disabling SR-IOV when VFs are assigned to VMs causes host crash
  so return -EPERM when user request to disable SR-IOV using pci sysfs in
  case of VFs are assigned to VMs.

Signed-off-by: Manish Chopra <manish.chopra@qlogic.com>
Signed-off-by: Shahed Shaikh <shahed.shaikh@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c
index 14f748cbf0de..280137991544 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c
@@ -461,6 +461,16 @@ static int qlcnic_pci_sriov_disable(struct qlcnic_adapter *adapter)
 {
         struct net_device *netdev = adapter->netdev;
 
+        if (pci_vfs_assigned(adapter->pdev)) {
+                netdev_err(adapter->netdev,
+                           "SR-IOV VFs belonging to port %d are assigned to VMs. SR-IOV can not be disabled on this port\n",
+                           adapter->portnum);
+                netdev_info(adapter->netdev,
+                            "Please detach SR-IOV VFs belonging to port %d from VMs, and then try to disable SR-IOV on this port\n",
+                            adapter->portnum);
+                return -EPERM;
+        }
+
         rtnl_lock();
         if (netif_running(netdev))
                 __qlcnic_down(adapter, netdev);