Bus Reset Observations

[Mark K. <mk...@co...>]

Hi,
   I don't know whether to report this as a stack problem or a gscanbus
problem. (I think stack...) I am seeing a very specific and repeatable
problem. To me, at a high level, this looks like incorrect operation at the
stack level. On my systems I believe that when the Linux based PC is not
connected to any 1394 devices, and a cable to a 1394 device is inserted into
the OHCI card, the 1394 stack does not recognize a cable insertion. 
 
   Can someone verify whether they are seeing or not seeing the same
results?
 
Thanks,
Mark
 
 
TESTS......
 
   I have set up 3 PCs with RH 6.2, downloaded the 2.2.15 kernel, built it
first with the patch, and then with the CVS tree. I have downloaded and
installed 1394libraw from the CVS tree and installed that. I have downloaded
gscanbus and am running it on all three PCs. Messages in /var/log look
pretty reasonable based on how many devices are on the bus. I can set up a
network with the 3 PCs and a few other peripherals, and sometimes get
gscanbus to correctly see the topology identically on all three machines.
(And sometimes not!)
 
   For gscanbus I built a guid-resolv.conf file with the GUIDs of each PC
and put the same file on all three PCs.
 
***** Test 1 *****
 
Connect 2 PCs and a Sony CD drive. Start gscanbus.
 
Observations: 
I see 2 PCs and one unknown device. 
If I pull the cable on the drive, I see 2 PCs. (Bus Reset detected)
If I insert the cable, the unknown device comes back. (Bus Reset Detected)
If I power off the drive, the unknown device disappears. (Bus Reset
Detected)
If I power the drive back up, the unknown device reappears. (Bus Reset
Detected)
 
*****************
 
***** Test 2 *****
 
Connect 1 PC and the Sony CD drive. Start gscanbus.
 
Observations:
 
I see 1 PC and one unknown device.
If I pull the cable, I see 1 PC. (Bus reset detected)
 
If I insert the drive cable, the drive does not come back. (Bus Reset is not
detected)
 
If I power off the drive, no change in the screen, because the screen is
incorrect right now. (Bus Reset Detected)
If I power the drive back up, then unknown device reappears. (Bus Reset
Detected)