From: Stephen Hemminger <stephen@networkplumber.org>
Date: Wed, 6 Sep 2017 13:53:06 -0700
Patch-mainline: v4.14-rc1
Subject: hv_netvsc: avoid unnecessary wakeups on subchannel creation
Git-commit: 8f2bb1de73344dbedd4195016b782bee7bf3598f
References: fate#323887
Only need to wakeup the initiator after all sub-channels
are opened.
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Olaf Hering <ohering@suse.de>
---
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
--- 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.