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@xxxxxxxxxxxxx> --- drivers/hv/channel.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-) diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c index 603ce97..c4dcab0 100644 --- a/drivers/hv/channel.c +++ b/drivers/hv/channel.c @@ -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: -- 1.7.4.1 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
