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

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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>
This commit is contained in:
Damian Hobson-Garcia
2012-11-16 14:46:10 +09:00
committed by Greg Kroah-Hartman
parent 24fce61b0b
commit 87c4d1a7dc
2 changed files with 5 additions and 3 deletions
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Documentation/DocBook/uio-howto.tmpl
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@@ -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>