This bug has been copied from bug #517893 and has been proposed to be backported to 5.4 z-stream (EUS).
in kernel-2.6.18-164.1.1.el5
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-2009-1455.html
On PowerPC platforms an additional step is required to realize the full effect of this qlge driver fix. The qla2xxx driver must be configured to use MSI-X interrupts instead of default INTA interrupts. Configure the qla2xxx driver to load with ql2xenablemsix=1 by adding an options line for qla2xxx to /etc/modprobe.conf or appending this option to an already existing options qa2xxx line. options qla2xxx ql2xenablemsix=1 After making this change to /etc/modprobe.conf a new initrd must be built as qla2xxx driver loads at boot. See Red Hat documentation for how to build new initrd.