Commit 06028d15 authored Jan 09, 2018 by Stephen Hemminger Committed by Greg Kroah-Hartman Jan 10, 2018

uio_hv_generic: check that host supports monitor page



In order for userspace application to signal host, it needs the
host to support the monitor page property. Check for the flag
and fail if this is not supported.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent e7d21464

drivers/uio/uio_hv_generic.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -133,6 +133,13 @@ hv_uio_probe(struct hv_device *dev,
		if (ret)
		goto fail;

		/* Communicating with host has to be via shared memory not hypercall */
		if (!dev->channel->offermsg.monitor_allocated) {
		dev_err(&dev->device, "vmbus channel requires hypercall\n");
		ret = -ENOTSUPP;
		goto fail_close;
		}

		dev->channel->inbound.ring_buffer->interrupt_mask = 1;
		set_channel_read_mode(dev->channel, HV_CALL_ISR);