This is a note to let you know that I've just added the patch titled
netvsc: Deal with rescinded channels correctly
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
netvsc-deal-with-rescinded-channels-correctly.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Mar 22 14:40:23 CET 2018
From: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
Date: Wed, 19 Apr 2017 13:53:49 -0700
Subject: netvsc: Deal with rescinded channels correctly
From: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
[ Upstream commit 73e64fa4f417b22d8d5521999a631ced8e2d442e ]
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rescinded.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even when the channel is rescinded.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@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/hyperv/netvsc.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -151,6 +151,13 @@ static void netvsc_destroy_buf(struct hv
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+ /* If the failure is because the channel is rescinded;
+ * ignore the failure since we cannot send on a rescinded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+ * even when the channel is rescinded.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
@@ -211,6 +218,15 @@ static void netvsc_destroy_buf(struct hv
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+ /* If the failure is because the channel is rescinded;
+ * ignore the failure since we cannot send on a rescinded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+ * even when the channel is rescinded.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
*/
Patches currently in stable-queue which might be from kys@xxxxxxxxxxxxx are
queue-4.9/netvsc-deal-with-rescinded-channels-correctly.patch