Based on bug 644863 comment 21, the patch has been verified by NetApp. 5.5.z shares the same patch with 5.6. Confirmed patch linux-2.6-scsi-qla2xxx-check-null-fcport-in-_queuecommands.patch is applied in kernel 2.6.18-194.30.1.el5 correctly. Set SanityOnly.
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.
http://rhn.redhat.com/errata/RHSA-2011-0004.html