From: Stephen Hemminger <stephen@networkplumber.org>
Date: Fri, 16 Mar 2018 15:44:27 -0700
Patch-mainline: v4.17-rc1
Subject: hv_netvsc: pass netvsc_device to rndis halt
Git-commit: 0e96460e620df7f9a13c352b68b06f02eec3de94
References: bsc#1107207 networking-stable-20_01_20

The caller has a valid pointer, pass it to rndis_filter_halt_device
and avoid any possible RCU races here.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Olaf Hering <ohering@suse.de>
---
 drivers/net/hyperv/rndis_filter.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -944,12 +944,11 @@ static bool netvsc_device_idle(const struct netvsc_device *nvdev)
 	return true;
 }
 
-static void rndis_filter_halt_device(struct rndis_device *dev)
+static void rndis_filter_halt_device(struct netvsc_device *nvdev,
+				     struct rndis_device *dev)
 {
 	struct rndis_request *request;
 	struct rndis_halt_request *halt;
-	struct net_device_context *net_device_ctx = netdev_priv(dev->ndev);
-	struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
 
 	/* Attempt to do a rndis device halt */
 	request = get_rndis_request(dev, RNDIS_MSG_HALT,
@@ -1348,7 +1347,7 @@ void rndis_filter_device_remove(struct hv_device *dev,
 	struct rndis_device *rndis_dev = net_dev->extension;
 
 	/* Halt and release the rndis device */
-	rndis_filter_halt_device(rndis_dev);
+	rndis_filter_halt_device(net_dev, rndis_dev);
 
 	net_dev->extension = NULL;