Commit b81658cf authored by K. Y. Srinivasan's avatar K. Y. Srinivasan Committed by Greg Kroah-Hartman
Browse files

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: default avatarK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b6ddeae1

drivers/hv/channel.c

+3 −1
Original line number Diff line number Diff line
@@ -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:

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