vxlan: fix a soft lockup in vxlan module removal

This is a regression introduced by:

	commit fe5c3561e6f0ac7c9546209f01351113c1b77ec8
	Author: stephen hemminger <[email protected]>
	Date:   Sat Jul 13 10:18:18 2013 -0700

	    vxlan: add necessary locking on device removal

The problem is that vxlan_dellink(), which is called with RTNL lock
held, tries to flush the workqueue synchronously, but apparently
igmp_join and igmp_leave work need to hold RTNL lock too, therefore we
have a soft lockup!

As suggested by Stephen, probably the flush_workqueue can just be
removed and let the normal refcounting work. The workqueue has a
reference to device and socket, therefore the cleanups should work
correctly.

Suggested-by: Stephen Hemminger <[email protected]>
Cc: Stephen Hemminger <[email protected]>
Cc: David S. Miller <[email protected]>
Tested-by: Cong Wang <[email protected]>
Signed-off-by: Cong Wang <[email protected]>
Acked-by: Stephen Hemminger <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

0 files changed, 0 insertions, 0 deletions