Xen devel - Aug 2010 - [PATCH 7/7] vtpm Mini-Os domain: linux tpmbk bugfixes

Signed-off-by: Matthew Fioravante <matthew.fioravante@jhuapl.edu>

This patch is for the xen linux kernel. It was made against 2.6.18 but 
is fairly simple and should apply cleanly to all of the xen kernels out 
there.

This patch fixes a couple of race conditions in the linux tpmbk driver. 
One of them is during startup and will cause the vtpm domains to fail to 
start correctly. The other race condition happens during shutdown and 
causes the vtpm tpmfrontend to release a shared page before the backend 
driver has unmapped it.



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