From: Stephen Hemminger <stephen@networkplumber.org>
Date: Wed, 6 Sep 2017 20:53:06 +0000 (-0700)
Subject: hv_netvsc: avoid unnecessary wakeups on subchannel creation
X-Git-Tag: v5.15~10389^2~35
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=8f2bb1de73344dbedd4195016b782bee7bf3598f;p=mirror_ubuntu-kernels.git

hv_netvsc: avoid unnecessary wakeups on subchannel creation

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>
---

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.