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[x/azure,12/17] uio_hv_generic: make ring buffer attribute for primary channel

Message ID 20190607193851.21914-13-marcelo.cerri@canonical.com
State New
Headers show
Series LP: #1812123 - Upstream Commits Needed for DPDK on Azure | expand

Commit Message

Marcelo Henrique Cerri June 7, 2019, 7:38 p.m. UTC 
From: Stephen Hemminger <stephen@networkplumber.org>

BugLink: http://bugs.launchpad.net/bugs/1812123

The primary channel also needs a ring buffer attribute. This allows
application to check if kernel supports uio sub channels, and also
makes all channels use consistent API.

Fixes: 37b96a4931db ("uio_hv_generic: support sub-channels")
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 9ab877a6ccf820483d79602bede0c1aa1da4d26a)
Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri@canonical.com>
---
 drivers/uio/uio_hv_generic.c | 5 +++++
 1 file changed, 5 insertions(+)
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Patch

diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c
index ab7a60fc02e7..73ed0f201764 100644
--- a/drivers/uio/uio_hv_generic.c
+++ b/drivers/uio/uio_hv_generic.c
@@ -294,6 +294,11 @@  hv_uio_probe(struct hv_device *dev,
 	vmbus_set_chn_rescind_callback(dev->channel, hv_uio_rescind);
 	vmbus_set_sc_create_callback(dev->channel, hv_uio_new_channel);
 
+	ret = sysfs_create_bin_file(&dev->channel->kobj, &ring_buffer_bin_attr);
+	if (ret)
+		dev_notice(&dev->device,
+			   "sysfs create ring bin file failed; %d\n", ret);
+
 	hv_set_drvdata(dev, pdata);
 
 	return 0;