[Bug 16463] New: aic7xxx: fails to notice if a disk is unplugged

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https://bugzilla.kernel.org/show_bug.cgi?id=16463

           Summary: aic7xxx: fails to notice if a disk is unplugged
           Product: SCSI Drivers
           Version: 2.5
    Kernel Version: 2.6.32-24-generic
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
        AssignedTo: scsi_drivers-other@kernel-bugs.osdl.org
        ReportedBy: rercola@acm.jhu.edu
        Regression: No


I have an external 7-disk array of SCA disks, connected to a backplane, with a
disk module that speaks 40-pin Fast SCSI:
[   15.992335] scsi0 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 7.0
[   15.992336]         <Adaptec 2940 SCSI adapter>
[   15.992337]         aic7870: Single Channel A, SCSI Id=7, 16/253 SCBs

I was testing my RAID-6 setup on these, so I yanked one of them while they were
in an MD. dmesg didn't report any change in disk status, and while any IO to
the disk stalled in state D forever, Linux never noticed the disk was gone.

I tried using the convenient script I keep around for forcing rescans of SCSI
and its related friends, which can be found at
http://bash.cyberciti.biz/diskadmin/rescan-linux-scsi-bus/, but even after
running that, the controller still didn't notice the disk was missing.

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