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Subject2.1.125/5.1 breaks aic7xxx support
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Booting up 2.1.125 on our main webserver results in an infinite loop
of bus resets as the driver attempts to probe the devices.

The system has an Asus p2l97-ds twin PII M/board with onboard aic7880,
and in addition to this we also have an adaptec 3940 for a grand total
of 3 ultra-narrow scsi chains.

[boot messages from 2.1.124]

scsi0 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.0.20/3.2.4
<Adaptec AIC-7880 Ultra SCSI host adapter>
scsi1 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.0.20/3.2.4
<Adaptec AHA-394X Ultra SCSI host adapter>
scsi2 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.0.20/3.2.4
<Adaptec AHA-394X Ultra SCSI host adapter>
scsi : 3 hosts.

(scsi0:0:-1:-1) Scanning channel for devices.
(scsi0:0:0:0) Synchronous at 20.0MHz, offset 15. [***]
Vendor: IBM Model: DCAS-34330 Rev: S65A
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sda at scsi0, channel 0, id 0, lun 0
(scsi1:0:-1:-1) Scanning channel for devices.
(scsi1:0:0:0) Synchronous at 20.0MHz, offset 15.
Vendor: IBM Model: DDRS-34560 Rev: S97B
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sdb at scsi1, channel 0, id 0, lun 0
(scsi1:0:1:0) Synchronous at 20.0MHz, offset 15.
Vendor: IBM Model: DDRS-34560 Rev: S97B
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sdc at scsi1, channel 0, id 1, lun 0
(scsi2:0:-1:-1) Scanning channel for devices.
(scsi2:0:1:0) Synchronous at 20.0MHz, offset 15.
Vendor: IBM OEM Model: DCHS09Z Rev: 5353
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sdd at scsi2, channel 0, id 1, lun 0
scsi : detected 4 SCSI disks total.

At the point marked [***] above, the 5.1 driver in 2.1.125 goes into
an infinite 'lets reset the bus on scsi0' loop.

This is something of a showstopper bug for us.

- Regards, Robert Collier.

--
Robert Collier - Network Operations - Frontier Internet
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