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

[Roland Dreier]

 > ipoib_stop() calls ipoib_ib_dev_down() which calls ipoib_mcast_dev_flush()
 > which calls ipoib_mcast_free(), which calls ipoib_mcast_leave(). The latter
 > calls ib_sa_free_multicast(), and this wait until the multicast
 > completion handler finishes. This happens to be
 > ipoib_mcast_join_complete(), which
 > waits for the rtnl_lock(), whcih was already taken by ipoib_stop().

I see...  I wonder why lockdep didn't warn about this in my testing.
Anyway, any ideas how we want to fix this?

 - R.