[Bug 233654] isp(4) regression after r316398 r316399

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233654

            Bug ID: 233654
           Summary: isp(4) regression after r316398 r316399
           Product: Base System
           Version: 11.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: aler at playground.ru

Previous revisions works fine.
Starting from r316399 it work for about ~10 minutes uptime and then starts
spamming errors liek this:

isp0: Chan 0 Abort Cmd for N-Port 0x000c @ Port 0x1f1200
isp0: Polled Mailbox Command ()x54) Timeout (5000000us) (isp_control:4705)
isp0: Mailbox Command 'EXECUTE IOCB A64' failed (TIMEOUT)
isp0: isp_watchdog: timeout for handle 0x11882025

and nothing works until hard reset.

Hardware:
isp0: <Qlogic ISP 2432 PCI FC-AL Adapter> port 0x4000-0x40ff mem
0xfbff0000-0xfbff3fff irq 30 at device 0.0 on pci6
isp1: <Qlogic ISP 2432 PCI FC-AL Adapter> port 0x4400-0x44ff mem
0xfbfe0000-0xfbfe3fff irq 37 at device 0.1 on pci6

Loading or not loading ispfw  doesn't change anything to this problem.

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