[PATCH v2 net-next 2/2] hv_netvsc: avoid unnecessary wakeups on subchannel creation
From: Stephen Hemminger <stephen@networkplumber.org>
Date: 2017-09-06 20:53:18
Subsystem:
hyper-v/azure core and drivers, networking drivers, the rest · Maintainers:
"K. Y. Srinivasan", Haiyang Zhang, Wei Liu, Dexuan Cui, Long Li, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Only need to wakeup the initiator after all sub-channels are opened. Signed-off-by: Stephen Hemminger <redacted> --- 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