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netvsc: fix error unwind on device setup failure

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If setting receive buffer fails, the error unwind would cause
kernel panic because it was not correctly doing RCU and NAPI
unwind.  RCU'd pointer needs to be reset to NULL, and NAPI needs
to be disabled not deleted.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger 2017-07-28 08:59:46 -07:00 committed by David S. Miller
parent 7426b1a518
commit 493933472d
1 changed files with 2 additions and 1 deletions
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3
drivers/net/hyperv/netvsc.c
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@ -1307,7 +1307,8 @@ struct netvsc_device *netvsc_device_add(struct hv_device *device,
return net_device;
close:
netif_napi_del(&net_device->chan_table[0].napi);
RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
napi_disable(&net_device->chan_table[0].napi);
/* Now, we can close the channel safely */
vmbus_close(device->channel);