[Bug 208605] New: AACRAID frequent hos bus reset with intensive IO on large arrays

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https://bugzilla.kernel.org/show_bug.cgi?id=208605

            Bug ID: 208605
           Summary: AACRAID frequent hos bus reset with intensive IO on
                    large arrays
           Product: SCSI Drivers
           Version: 2.5
    Kernel Version: 4.14 - 5.7.8
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: AACRAID
          Assignee: scsi_drivers-aacraid@kernel-bugs.osdl.org
          Reporter: janpieter.sollie@edpnet.be
        Regression: No

Created attachment 290345
  --> https://bugzilla.kernel.org/attachment.cgi?id=290345&action=edit
quick and dirty patch to fix the issue

On a large array (>15 drives), it is impossible to backup the storage to a SAS
tape without the driver detecting a lockup, and causing a bus reset.
This seems to be a false detection, as the host controller actually is not
locking up anything.  It's just a bit delayed.
This issue seems to go back to 4.14.

I reverted some cleanup stuff introduced in 4.14, and the driver is working
correctly.

I attached a patch for it, but this is just to show where the bug may be, it is
not ready for production (though it works, but this may be for 7 series only). 
I also have no idea what exactly causes this issue

Bug observed on a series 7 controller with a 12-drive RAID6 array.

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