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netvsc: Deal with rescinded channels correctly 

We will not be able to send packets over a channel that has been
rescinded. Make necessary adjustments so we can properly cleanup
even when the channel is rescinded. This issue can be trigerred
in the NIC hot-remove path.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
K. Y. Srinivasan 2017-04-19 13:53:49 -07:00 committed by David S. Miller
parent 87e978edac
commit 73e64fa4f4
1 changed files with 16 additions and 0 deletions
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16
drivers/net/hyperv/netvsc.c
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@ -135,6 +135,13 @@ static void netvsc_destroy_buf(struct hv_device *device)
sizeof(struct nvsp_message),
(unsigned long)revoke_packet,
VM_PKT_DATA_INBAND, 0);
/* If the failure is because the channel is rescinded;
* ignore the failure since we cannot send on a rescinded
* channel. This would allow us to properly cleanup
* even when the channel is rescinded.
*/
if (device->channel->rescind)
ret = 0;
/*
* If we failed here, we might as well return and
* have a leak rather than continue and a bugchk
@ -195,6 +202,15 @@ static void netvsc_destroy_buf(struct hv_device *device)
sizeof(struct nvsp_message),
(unsigned long)revoke_packet,
VM_PKT_DATA_INBAND, 0);
/* If the failure is because the channel is rescinded;
* ignore the failure since we cannot send on a rescinded
* channel. This would allow us to properly cleanup
* even when the channel is rescinded.
*/
if (device->channel->rescind)
ret = 0;
/* If we failed here, we might as well return and
* have a leak rather than continue and a bugchk
*/