Re: [PATCH] fix for Domain Validation hang on some devices with sym_2driver

["Kai OM" <epimetreus@fastmail.fm>]

On 19 Aug 2004 22:55:57 -0400, "James Bottomley"
<James.Bottomley@SteelEye.com> said:
> There's a bad hang where the driver locks the system solid trying to do
> domain validation with certain devices.  The one I've managed to
> reproduce it with is a Quantum Atlas.
> 
> What happens is that setting the offset to zero is an async negotiation
> message.  However, the driver still seems to have DT set (which is
> illegal).  Most devices just reject this as stupid, but the Quantum
> seems to try to obey it and hangs the bus.
> 
> The simple fix is to reset all PPR options when the offset is set to
> zero.

As they said in the '90s, "you da' man."

It works perfectly, so far as I can tell.

So, um, what I want to know is... why did the issue appear to go away
for some people if they switched controllers?

I don't know a terrible lot about SCSI devices, so maybe someone here
could tell me if there's a reason that would happen, or is this to be
expected?