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hv_netvsc: disable NAPI before channel close 

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

Fixes: 76bb5db5c7 ("netvsc: fix use after free on module removal")
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2018-03-20 15:03:02 -07:00 committed by David S. Miller
parent 68e2ffdeb5
commit 8348e0460a
1 changed files with 4 additions and 4 deletions
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8
drivers/net/hyperv/netvsc.c
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@ -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);
}