From: Mitch A Williams <mitch.a.williams@intel.com>
Date: Thu, 20 Jun 2013 06:03:36 +0000 (+0000)
Subject: igb: don't allow SR-IOV without MSI-X
X-Git-Tag: accepted/tizen/common/20141203.182822~1569^2~206^2~11
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=502671967403c611b362836aef8cdee65e9a626a;p=platform%2Fkernel%2Flinux-arm64.git

igb: don't allow SR-IOV without MSI-X

MSI-X interrupts are required for SR-IOV operation. Check to make sure
they're enabled before allowing the user to turn on VFs.

Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 8e7c1b8..94295a0 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -2436,6 +2436,11 @@ static int igb_enable_sriov(struct pci_dev *pdev, int num_vfs)
 	int err = 0;
 	int i;
 
+	if (!adapter->msix_entries) {
+		err = -EPERM;
+		goto out;
+	}
+
 	if (!num_vfs)
 		goto out;
 	else if (old_vfs && old_vfs == num_vfs)