[openib-general] ipoib lockdep warning

[Roland Dreier]

 > i agree that the IDR subsystem should be irq-safe if GFP_ATOMIC is 
 > passed in. So the _irqsave()/_irqrestore() fix should be done.

OK, I will send the idr change to Andrew.

 > But i also think that you should avoid using GFP_ATOMIC for any sort of 
 > reliable IO path and push as much work into process context as possible. 
 > Is it acceptable for your infiniband IO model to fail with -ENOMEM if 
 > GFP_ATOMIC happens to fail, and is the IO retried transparently?

Yes, I think it's OK.  This idr use is in an inherently unreliable
path.  With that said, as Michael pointed out, we can change things to
use GFP_ATOMIC less.

Thanks,
  Roland