netdev - [PATCH PATCH net 1/4] hv_netvsc: disable NAPI before channel close

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Message-Id: <20180320220305.32223-2-sthemmin@microsoft.com>
Date:   Tue, 20 Mar 2018 15:03:02 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com
Cc:     devel@...uxdriverproject.org, netdev@...r.kernel.org
Subject: [PATCH PATCH net 1/4] hv_netvsc: disable NAPI before channel close

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>
---
 drivers/net/hyperv/netvsc.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 0265d703eb03..e70a44273f55 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -568,6 +568,10 @@ void netvsc_device_remove(struct hv_device *device)
 
 	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
@@ -579,10 +583,6 @@ void netvsc_device_remove(struct hv_device *device)
 
 	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);
 }
-- 
2.16.2