netvsc: fix race on sub channel creation
authorstephen hemminger <stephen@networkplumber.org>
Fri, 4 Aug 2017 00:13:54 +0000 (17:13 -0700)
committerDavid S. Miller <davem@davemloft.net>
Mon, 7 Aug 2017 04:23:21 +0000 (21:23 -0700)
commit732e49850c5e15231e11a0a464748bcbade5e3c2
tree5d000b7307ee1935be7492297897bf4bbb30c6ca
parent2c460621bb2e6baf8a475c407cdb29029b2497ac
netvsc: fix race on sub channel creation

The existing sub channel code did not wait for all the sub-channels
to completely initialize. This could lead to race causing crash
in napi_netif_del() from bad list. The existing code would send
an init message, then wait only for the initial response that
the init message was received. It thought it was waiting for
sub channels but really the init response did the wakeup.

The new code keeps track of the number of open channels and
waits until that many are open.

Other issues here were:
  * host might return less sub-channels than was requested.
  * the new init status is not valid until after init was completed.

Fixes: b3e6b82a0099 ("hv_netvsc: Wait for sub-channels to be processed during probe")
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/hyperv/hyperv_net.h
drivers/net/hyperv/netvsc.c
drivers/net/hyperv/rndis_filter.c