Description of problem:
With an attached SCSI device, rmmod'ing the aic79xx module causes kernel panic.


Version-Release number of selected component (if applicable):
kernel-2.6.9-22.0.1.EL

How reproducible:
Always

Steps to Reproduce:
1. attach SCSI device
2. boot
3. 'rmmod aic79xx'
  
Actual results:
Kernel panic (see attached screenshots)

Expected results:
module should be removed.

Additional info:
* See bug #171957 (tested with FC4, appearantly fixed in kernel-2.6.14-1.1636_FC4).

* Reason for rmmod'ing : Attached to SCSI card is a JetStor RAID array. When the
array is expanded, an rmmod is needed to let the kernel recognize the enlarged
disk geometry (the alternative is a reboot, which is not always an option in a
production environment).

* SCSI card is an Adaptec 29320ALP :
'# cat /proc/scsi/aic79xx/0' :

Adaptec AIC79xx driver version: 1.3.11
Adaptec 29320ALP Ultra320 SCSI adapter
aic7901: Ultra320 Wide Channel A, SCSI Id=7, PCI 33 or 66Mhz, 512 SCBs
Allocated SCBs: 4, SG List Length: 128

Serial EEPROM:
0x17c8 0x17c8 0x17c8 0x17c8 0x17c8 0x17c8 0x17c8 0x17c8
0x17c8 0x17c8 0x17c8 0x17c8 0x17c8 0x17c8 0x17c8 0x17c8
0x09f4 0x0142 0x2807 0x0010 0xffff 0xffff 0xffff 0xffff
0xffff 0xffff 0xffff 0xffff 0xffff 0xffff 0x0430 0xb3f3

Target 0 Negotiation Settings
        User: 320.000MB/s transfers (160.000MHz DT|IU|RTI|QAS, 16bit)
        Goal: 160.000MB/s transfers (80.000MHz DT, 16bit)
        Curr: 160.000MB/s transfers (80.000MHz DT, 16bit)
        Transmission Errors 0
...

* The kernel panic first displays some SCSI output (module is loaded with
parameter aic79xx=verbose) ; after pressing the hosts' power on/off button, I
suppose an ACPI signal is sent, end I get a kernel trace, followed by a second
trace after approx. one second (see attached screenshots ; output is not logged
to /var/log/messages).