linux-kernel - [PATCH V2 03/15] Drivers: hv: vmbus: Prevent sending data on a rescinded channel

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Date:   Sat,  3 Dec 2016 12:34:30 -0800
From:   kys@...hange.microsoft.com
To:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
        vkuznets@...hat.com, jasowang@...hat.com,
        leann.ogasawara@...onical.com
Cc:     "K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH V2 03/15] Drivers: hv: vmbus: Prevent sending data on a rescinded channel

From: K. Y. Srinivasan <kys@...rosoft.com>

After the channel is rescinded, the host does not read from the rescinded channel.
Fail writes to a channel that has already been rescinded.

Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
 drivers/hv/ring_buffer.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c
index cd49cb1..72f649d 100644
--- a/drivers/hv/ring_buffer.c
+++ b/drivers/hv/ring_buffer.c
@@ -298,6 +298,9 @@ int hv_ringbuffer_write(struct vmbus_channel *channel,
 	unsigned long flags = 0;
 	struct hv_ring_buffer_info *outring_info = &channel->outbound;
 
+	if (channel->rescind)
+		return -ENODEV;
+
 	for (i = 0; i < kv_count; i++)
 		totalbytes_towrite += kv_list[i].iov_len;
 
-- 
1.7.4.1