tree 8359afd781878ca4e75ca34f1cd328f469815f5d
parent 0105d2b4fbc24c2fb6ca9bae650784dd7ddf0b12
author Daniel De Graaf <dgdegra@tycho.nsa.gov> 1322498951 -0500
committer Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 1324052770 -0500

xen/gntalloc: fix reference counts on multi-page mappings

When a multi-page mapping of gntalloc is created, the reference counts
of all pages in the vma are incremented. However, the vma open/close
operations only adjusted the reference count of the first page in the
mapping, leaking the other pages. Store a struct in the vm_private_data
to track the original page count to properly free the pages when the
last reference to the vma is closed.

Reported-by: Anil Madhavapeddy <anil@recoil.org>
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>