From: Daniel Pieczko <dpieczko@solarflare.com>
Date: Tue, 2 Jun 2015 10:40:31 +0000 (+0100)
Subject: sfc: do not allow VFs to be destroyed if assigned to guests
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=71158bf2e748e2710616f59a823619af3c5505a7;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

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 cd524543c363..083c534bc4ec 100644
--- 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;