tree c62cff35187c87c8a2b1f6dafdfc577cba94c137
parent bc5fc7e4b22ca855902aba02b28c96f09b446407
author Nisheeth Bhat <nisheeth.bhat@intel.com> 1317305410 -0400
committer Matthew Wilcox <matthew.r.wilcox@intel.com> 1320436384 -0400

Fix calculation of number of pages in a PRP List

The existing calculation underestimated the number of pages required
as it did not take into account the pointer at the end of each page.
The replacement calculation may overestimate the number of pages required
if the last page in the PRP List is entirely full.  By using ->npages
as a counter as we fill in the pages, we ensure that we don't try to
free a page that was never allocated.

Signed-off-by: Nisheeth Bhat <nisheeth.bhat@intel.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>