It should first alloc workqueue and request irq, and finally enable irq.

Link: https://lore.kernel.org/r/1629985056-57004-6-git-send-email-liangwenpeng@huawei.comSigned-off-by: NWenpeng Liang <liangwenpeng@huawei.com>
Signed-off-by: NJason Gunthorpe <jgg@nvidia.com>