Make retries obey host_self_blocked flag

The following patch against 2.6.2 will prevent the midlayer from issuing retries if host_self_blocked is set. This was raised as an issue here:

http://marc.theaimsgroup.com/?l=linux-scsi&m=107357742430401&w=2

I'm trying to improve and extend scsi_block_requests, and this is the first, and hopefully least controversial, step.

Brian King
eServer Storage I/O
IBM Linux Technology Center