From: K. Y. Srinivasan <kys@microsoft.com>
Date: Fri, 23 Dec 2016 00:54:00 +0000 (-0800)
Subject: Drivers: hv: vmbus: Fix a rescind handling bug
X-Git-Tag: archive/raspbian/4.9.51-1+rpi1~5^2~330
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=a0cf57581db58cb6a7ad273c4d07f21e0d3bc5c0;p=linux-4.9.git

Drivers: hv: vmbus: Fix a rescind handling bug

commit ccb61f8a99e6c29df4fb96a65dad4fad740d5be9 upstream.

The host can rescind a channel that has been offered to the
guest and once the channel is rescinded, the host does not
respond to any requests on that channel. Deal with the case where
the guest may be blocked waiting for a response from the host.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 1606e7f08f4b..9aff4f6f5423 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -506,6 +506,11 @@ int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle)
 
 	wait_for_completion(&info->waitevent);
 
+	if (channel->rescind) {
+		ret = -ENODEV;
+		goto post_msg_err;
+	}
+
 post_msg_err:
 	/*
 	 * If the channel has been rescinded;