Re: [linux-usb-devel] 2.6.11-rc3-bk5, oops in scsi_try_bus_reset

[Mike Anderson <andmike@us.ibm.com>]

Alan Stern [stern@rowland.harvard.edu] wrote:
> And Mike Anderson's response was
> 
> http://marc.theaimsgroup.com/?l=linux-scsi&m=110538854224319&w=2
> 
> His explanation was "Currently scsi_host_cancel being called from
> scsi_remove_host appears to not do anything as scsi_forget_host removes
> the devices from the list it iterates over."  I don't know whether this 
> problem has been fixed yet.
> 


No, this has not been fixed yet, but needs to be. 

In discussing this with Mike C today he had a patch that would drain the
devices queues prior to scsi_forget_host returning which may help in this
case. 

Along with Mike C's change we could remove the scsi_host_cancel code
(since it does not do anything and when it did it was racey), and shutdown
the error handler thread in scsi_remove_host (reduce possible callers into
the LLDD post scsi_remove_host).

Mike C or I will have something out soon on this.

-andmike
--
Michael Anderson
andmike@us.ibm.com