[Bugme-new] [Bug 11349] New: connection loss when an additional device is plugged into a 6-port hub

[bugme-daemon at bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=11349

           Summary: connection loss when an additional device is plugged
                    into a 6-port hub
           Product: Drivers
           Version: 2.5
     KernelVersion: all
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: IEEE1394
        AssignedTo: drivers_ieee1394 at kernel-bugs.osdl.org
        ReportedBy: stefan-r-bz at s5r6.in-berlin.de


If there is a bus consisting of PC--hub--device_A and another device_B is
plugged in into the hub, then the PC may briefly loose contact with device_A.
This is troublesome if a filesystem was mounted device_A or the device was
otherwise in use.

This only happens with _some_ devices as device_B, but presumably with all
6-port hubs.  (There is only one known 6-port PHY chip, hence all 6-port hubs
are very similar WRT to PHY functionality.)  Affected are both the ieee1394 and
the firewire driver stack.  Windows XP and Mac OS X are known to handle this
without connection loss, i.e. without danger to mounted filesystems.

More data reported here:  http://marc.info/?l=linux1394-user&m=121875239304371


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