tree 2f41f71bff2077360c435c134f1d22217f89958e
parent b57c18694ea1641b691fa05ed8af0ce339fa430b
author Daniel De Graaf <dgdegra@tycho.nsa.gov> 1297285892 -0500
committer Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 1297710982 -0500

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>