Initially reported in https://bugs.gentoo.org/show_bug.cgi?id=296868#c3. Need to check this at time 2.6.33 will be out.
There is suggested fix at: http://bugs.gentoo.org/attachment.cgi?id=215579
Looks, like it would work. Personally, I used a kernel version conditional patch with the same effect. Other than this, it seems to work with 2.6.33.
The suggested fix works with gentoo-sources-2.6.33 vhba-1.2.1 fails to build without it. Thanks for the tip.
Patch to fix this issue was just commited. Fixed.