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| author | Stephen Hemminger <stephen@networkplumber.org> | 2018-01-09 12:57:31 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-12 12:32:19 +0200 |
| commit | d96a094c987f5409f0037aa4964eab989f6f4ea8 (patch) | |
| tree | cec9eeed2b90544874b9d368525e0bcc680315dd /drivers/uio | |
| parent | 28b35f9aa0c068075ca57ab646d87e2f607a9d5c (diff) | |
| download | linux-stable-d96a094c987f5409f0037aa4964eab989f6f4ea8.tar.gz linux-stable-d96a094c987f5409f0037aa4964eab989f6f4ea8.tar.bz2 linux-stable-d96a094c987f5409f0037aa4964eab989f6f4ea8.zip | |
uio_hv_generic: check that host supports monitor page
[ Upstream commit 06028d15177a1b406b7b075ea47c6a352732f23a ]
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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/uio')
| -rw-r--r-- | drivers/uio/uio_hv_generic.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c index 48d5327d38d4..fe5cdda80b2c 100644 --- a/drivers/uio/uio_hv_generic.c +++ b/drivers/uio/uio_hv_generic.c @@ -124,6 +124,13 @@ 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_DIRECT); |