[HW] allow retrieving CA attributes with pageable memory. [winof: 2408]

[HW] allow retrieving CA attributes with pageable memory. [winof: 2408]

Modify the HCA drivers to support querying for attributes using a pageable buffer.  Since the query calls block, it seems appropriate for the calls to allow pageable memory, rather than forcing the user to allocate a non-paged buffer in order to obtain a list of attributes.  The problem stems from the HCA drivers accessing a user's buffer after acquiring a spinlock that raise IRQL.

This fixes kernel crashes with both the winmad and winverbs drivers.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
git-svn-id: svn://openib.tc.cornell.edu/gen1@2411 ad392aa1-c5ef-ae45-8dd8-e69d62a5ef86