From 36203e71a0604baa547a6706b5e70ee2830a2407 Mon Sep 17 00:00:00 2001
From: Jes Sorensen <Jes.Sorensen@redhat.com>
Date: Tue, 5 May 2015 18:36:55 -0400
Subject: [PATCH] staging: unisys: visorchannel_read(): Use memcpy_fromio()
 directly

Note, this changes the behavior of visorchannel_read(). The old code
would return the channel header, if the offset argument was 0, and the
caller tried to read beyond the size of the visorchannel. Note this
only worked for offset == 0, but not for
(offset > 0) && (offset < header_size), which was inconsistent.

The new implementation returns an error if someone tries to read
beyond the visorchannel size.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
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