From: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Date: Wed, 9 Feb 2011 21:11:32 +0000 (-0500)
Subject: xen-gntdev: Avoid double-mapping memory
X-Git-Tag: v2.6.39-rc1~439^3~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=12996fc38a2d760f3b30c9ceae26d0eeb92fe52d;p=pandora-kernel.git

xen-gntdev: Avoid double-mapping memory

If an already-mapped area of the device was mapped into userspace a
second time, a hypercall was incorrectly made to remap the memory
again. Avoid the hypercall on later mmap calls, and fail the mmap call
if a writable mapping is attempted on a read-only range.

Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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