From: Slawomir Laba <slawomirx.laba@intel.com>
Date: Tue, 23 Jul 2019 06:01:39 -0400
Subject: i40e: Fix crash caused by stress setting of VF MAC addresses
Patch-mainline: v5.4-rc1
Git-commit: 9889707b06acfe9bb37a6edcaae627d4a5eacc72
References: jsc#SLE-8025

Add update to the VSI pointer passed to the i40e_set_vf_mac function.
If VF is in reset state the driver waits in i40e_set_vf_mac function
for the reset to be complete, yet after reset the vsi pointer
that was passed into this function is no longer valid.

The patch updates local VSI pointer directly from pf->vsi array,
by using the id stored in VF pointer (lan_vsi_idx).

Without this commit the driver might occasionally invoke general
protection fault in kernel and disable the OS entirely.

Signed-off-by: Slawomir Laba <slawomirx.laba@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -3967,10 +3967,15 @@ int i40e_ndo_set_vf_mac(struct net_devic
 	/* When the VF is resetting wait until it is done.
 	 * It can take up to 200 milliseconds,
 	 * but wait for up to 300 milliseconds to be safe.
+	 * If the VF is indeed in reset, the vsi pointer has
+	 * to show on the newly loaded vsi under pf->vsi[id].
 	 */
 	for (i = 0; i < 15; i++) {
-		if (test_bit(I40E_VF_STATE_INIT, &vf->vf_states))
+		if (test_bit(I40E_VF_STATE_INIT, &vf->vf_states)) {
+			if (i > 0)
+				vsi = pf->vsi[vf->lan_vsi_idx];
 			break;
+		}
 		msleep(20);
 	}
 	if (!test_bit(I40E_VF_STATE_INIT, &vf->vf_states)) {