[PATCH 19/44] s390: implement ->mapping_error

[Gerald Schaefer]

On Thu,  8 Jun 2017 15:25:44 +0200
Christoph Hellwig <hch at lst.de> wrote:

> s390 can also use noop_dma_ops, and while that currently does not return
> errors it will so in the future.  Implementing the mapping_error method
> is the proper way to have per-ops error conditions.
> 
> Signed-off-by: Christoph Hellwig <hch at lst.de>

Acked-by: Gerald Schaefer <gerald.schaefer at de.ibm.com>