[ofa-general] [PATCH v2] ipiob: fix rtnl deadlock

[Roland Dreier]

 > Seems like taking rtnl_lock in ipoib_mcast_join_complete() also causes a deadlock.
 > See bug #1186.

I have to admit the deadlock isn't obvious to
me... ipoib_mcast_join_complete() runs in the ib_mad1 thread, so I'm not
sure how that thread is getting flushed.  Can you reproduce this
deadlock with lockdep enabled and get the output from that?

 - R.