drivers: uio_dmem_genirq: Don't use DMA_ERROR_CODE to indicate unmapped regions

DMA_ERROR_CODE is not defined on all architectures and is architecture
specific.  Instead, use the constant, ~0 to indicate unmapped regions.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Damian Hobson-Garcia <dhobsong@igel.co.jp>
Cc: "Hans J. Koch" <hjk@hansjkoch.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/Documentation/DocBook/uio-howto.tmpl b/Documentation/DocBook/uio-howto.tmpl
index fdbf86fcfcc..ddb05e98af0 100644
--- a/Documentation/DocBook/uio-howto.tmpl
+++ b/Documentation/DocBook/uio-howto.tmpl
@@ -771,7 +771,7 @@ framework to set up sysfs files for this region. Simply leave it alone.
         <varname>/sys/class/uio/uioX/maps/mapY/*</varname>.
         The dynmaic memory regions will be freed when the UIO device file is
         closed. When no processes are holding the device file open, the address
-        returned to userspace is DMA_ERROR_CODE.
+        returned to userspace is ~0.
         </para>
 </sect1>