Commit 42b0681b authored by K. Y. Srinivasan's avatar K. Y. Srinivasan Committed by Greg Kroah-Hartman

Drivers: hv: vmbus: Prevent sending data on a rescinded channel

commit e7e97dd8 upstream.

After the channel is rescinded, the host does not read from the rescinded channel.
Fail writes to a channel that has already been rescinded. If we permit writes on a
rescinded channel, since the host will not respond we will have situations where
we will be unable to unload vmbus drivers that cannot have any outstanding requests
to the host at the point they are unoaded.
Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f791a7b4
...@@ -298,6 +298,9 @@ int hv_ringbuffer_write(struct vmbus_channel *channel, ...@@ -298,6 +298,9 @@ int hv_ringbuffer_write(struct vmbus_channel *channel,
unsigned long flags = 0; unsigned long flags = 0;
struct hv_ring_buffer_info *outring_info = &channel->outbound; struct hv_ring_buffer_info *outring_info = &channel->outbound;
if (channel->rescind)
return -ENODEV;
for (i = 0; i < kv_count; i++) for (i = 0; i < kv_count; i++)
totalbytes_towrite += kv_list[i].iov_len; totalbytes_towrite += kv_list[i].iov_len;
...@@ -350,6 +353,10 @@ int hv_ringbuffer_write(struct vmbus_channel *channel, ...@@ -350,6 +353,10 @@ int hv_ringbuffer_write(struct vmbus_channel *channel,
spin_unlock_irqrestore(&outring_info->ring_lock, flags); spin_unlock_irqrestore(&outring_info->ring_lock, flags);
hv_signal_on_write(old_write, channel, kick_q); hv_signal_on_write(old_write, channel, kick_q);
if (channel->rescind)
return -ENODEV;
return 0; return 0;
} }
......
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