Also you need to undefine all devices which have the HBA as a parent.
If you are using a multipath software, find out if you can discontinue the use of a specific HBA and its dependencies. in SDD from V 1.6 (I think) you can remove adapters and/or paths, which was specially added to accommodate PCI hotswap operations. For other multipathing softwares - look in your manual.
Setting paths and/or adapters offline is not enough.
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