linux-kernel - [PATCH 4.14 027/165] hv_netvsc: disable NAPI before channel close

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Message-Id: <20180524093623.079465971@linuxfoundation.org>
Date:   Thu, 24 May 2018 11:37:13 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Stephen Hemminger <sthemmin@...rosoft.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.14 027/165] hv_netvsc: disable NAPI before channel close

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

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

[ Commit 8348e0460ab1473f06c8b824699dd2eed3c1979d upstream. ]

This makes sure that no CPU is still process packets when
the channel is closed.

Fixes: 76bb5db5c749 ("netvsc: fix use after free on module removal")
Signed-off-by: Stephen Hemminger <sthemmin@...rosoft.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/hyperv/netvsc.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -567,6 +567,10 @@ void netvsc_device_remove(struct hv_devi
 
 	RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
 
+	/* And disassociate NAPI context from device */
+	for (i = 0; i < net_device->num_chn; i++)
+		netif_napi_del(&net_device->chan_table[i].napi);
+
 	/*
 	 * At this point, no one should be accessing net_device
 	 * except in here
@@ -578,10 +582,6 @@ void netvsc_device_remove(struct hv_devi
 
 	netvsc_teardown_gpadl(device, net_device);
 
-	/* And dissassociate NAPI context from device */
-	for (i = 0; i < net_device->num_chn; i++)
-		netif_napi_del(&net_device->chan_table[i].napi);
-
 	/* Release all resources */
 	free_netvsc_device_rcu(net_device);
 }