Libahci kernel panic in interrupt context when enable FBS feature

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Hi, Jgarzik

When enable FBS feature, ahci_port_intr function will kernel panic if
have PORT_IRQ_ERROR error. I can't capture the log, but the code patch
is very clear:

            ata_exec_internal  [ the function might sleep ]
             sata_pmp_read
             sata_pmp_scr_read
             sata_scr_read
             ata_phys_link_online
             ata_link_online
             ahci_error_intr
             ahci_port_intr

Now, i can't find the best method to fix the issue, so, please help
fix the issue. Thanks!
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