From: Andrew G. Harvey <agh@cisco.com>
Date: Tue, 23 Sep 2008 23:10:02 +0000 (+0200)
Subject: UIO: Fix mapping of logical and virtual memory
X-Git-Tag: v2.6.28-rc1~284^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=02683ffdf655b4ae15245376ba6fea6d9e5829a6;p=pandora-kernel.git

UIO: Fix mapping of logical and virtual memory

mmap() doesn't work as expected for UIO_MEM_LOGICAL or UIO_MEM_VIRTUAL
mappings. The offset into the memory needs to be added, otherwise
uio_vma_fault always returns the first page only. Note that for UIO
userspace calls mmap() with offset = N * getpagesize() to access
mapping N. This must be compensated when calculating the offset. A
comment was added to explain this since it is not obvious.

Signed-off-by: Andrew G. Harvey <agh@cisco.com>
Signed-off-by: Hans J. Koch <hjk@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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