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Drivers: hv: vmbus: Permit sending of packets without payload 

The guest may have to send a completion packet back to the host.
To support this usage, permit sending a packet without a payload -
we would be only sending the descriptor in this case.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
K. Y. Srinivasan 2015-08-01 16:08:14 -07:00 committed by Greg Kroah-Hartman
parent b6ddeae160
commit b81658cf5d
1 changed files with 3 additions and 1 deletions
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4
drivers/hv/channel.c
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@ -601,6 +601,7 @@ int vmbus_sendpacket_ctl(struct vmbus_channel *channel, void *buffer,
u64 aligned_data = 0;
int ret;
bool signal = false;
int num_vecs = ((bufferlen != 0) ? 3 : 1);
/* Setup the descriptor */
@ -618,7 +619,8 @@ int vmbus_sendpacket_ctl(struct vmbus_channel *channel, void *buffer,
bufferlist[2].iov_base = &aligned_data;
bufferlist[2].iov_len = (packetlen_aligned - packetlen);
ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal);
ret = hv_ringbuffer_write(&channel->outbound, bufferlist, num_vecs,
&signal);
/*
* Signalling the host is conditional on many factors: