netdev - [PATCH net-stable 13/24] hv_netvsc: cancel subchannel setup before halting device

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Message-Id: <20180514223223.25433-14-sthemmin@microsoft.com>
Date:   Mon, 14 May 2018 15:32:12 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org,
        Stephen Hemminger <stephen@...workplumber.org>,
        Stephen Hemminger <sthemmin@...rosoft.com>
Subject: [PATCH net-stable 13/24] hv_netvsc: cancel subchannel setup before halting device

From: Stephen Hemminger <stephen@...workplumber.org>

commit a7483ec0267c69b34e818738da60b392623da94b upstream

Block setup of multiple channels earlier in the teardown
process. This avoids possible races between halt and subchannel
initialization.

Suggested-by: Haiyang Zhang <haiyangz@...rosoft.com>
Signed-off-by: Stephen Hemminger <sthemmin@...rosoft.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
---
 drivers/net/hyperv/rndis_filter.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index 05109ed5377c..5a312b2d5a7b 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -1340,6 +1340,9 @@ void rndis_filter_device_remove(struct hv_device *dev,
 {
 	struct rndis_device *rndis_dev = net_dev->extension;
 
+	/* Don't try and setup sub channels if about to halt */
+	cancel_work_sync(&net_dev->subchan_work);
+
 	/* Halt and release the rndis device */
 	rndis_filter_halt_device(rndis_dev);
 
-- 
2.17.0