[PATCH v2 net-next 2/2] hv_netvsc: avoid unnecessary wakeups on subchannel creation

[Stephen Hemminger]

Only need to wakeup the initiator after all sub-channels
are opened.

Signed-off-by: Stephen Hemminger <sthem...@microsoft.com>
---
 drivers/net/hyperv/rndis_filter.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/hyperv/rndis_filter.c 
b/drivers/net/hyperv/rndis_filter.c
index 731bc7cc6f43..065b204d8e17 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -1048,8 +1048,8 @@ static void netvsc_sc_open(struct vmbus_channel *new_sc)
        else
                netdev_notice(ndev, "sub channel open failed: %d\n", ret);
 
-       atomic_inc(&nvscdev->open_chn);
-       wake_up(&nvscdev->subchan_open);
+       if (atomic_inc_return(&nvscdev->open_chn) == nvscdev->num_chn)
+               wake_up(&nvscdev->subchan_open);
 }
 
 /* Open sub-channels after completing the handling of the device probe.
-- 
2.11.0