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

[Roland Dreier]

 > Instead of loop-waiting for the lock, give it up if can't lock.
 > Same thing is done in drivers/net/cxgb3/cxgb3_main.c.

I think this is worse ... now if there's anything (*anything* at all --
even stuff related to different devices) holding the rtnl lock at the
wrong time, we lose an mtu update.

I haven't had a chance to look at this in detail yet, but I would really
like to investigate whether we can just avoid the potential deadlock in
some more elegant way.