From: Emil Tantilov <emil.s.tantilov@intel.com>
Date: Tue, 22 May 2018 09:18:46 -0700
Subject: ixgbevf: fix possible race in the reset subtask
Patch-mainline: v4.18-rc1
Git-commit: 7d6446db1bcb1008b84db098f4629664cd8b06a6
References: bsc#1101674 FATE#325150 FATE#325151

Extend the RTNL lock in ixgbevf_reset_subtask() to protect the state bits
check in addition to the call to ixgbevf_reinit_locked().

This is to make sure that we get the most up-to-date values for the bits
and avoid a possible race when going down.

Suggested-by: Zhiping du <zhipingdu@tencent.com>
Signed-off-by: Emil Tantilov <emil.s.tantilov@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/ixgbevf/ixgbevf_main.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -2880,15 +2880,17 @@ static void ixgbevf_reset_subtask(struct
 	if (!test_and_clear_bit(__IXGBEVF_RESET_REQUESTED, &adapter->state))
 		return;
 
+	rtnl_lock();
 	/* If we're already down or resetting, just bail */
 	if (test_bit(__IXGBEVF_DOWN, &adapter->state) ||
 	    test_bit(__IXGBEVF_REMOVING, &adapter->state) ||
-	    test_bit(__IXGBEVF_RESETTING, &adapter->state))
+	    test_bit(__IXGBEVF_RESETTING, &adapter->state)) {
+		rtnl_unlock();
 		return;
+	}
 
 	adapter->tx_timeout_count++;
 
-	rtnl_lock();
 	ixgbevf_reinit_locked(adapter);
 	rtnl_unlock();
 }