tree 5c3a30bec263cb62538f08834db5e1cfec64c265
parent 31151ba2cef171344beac254e65bd7e00138bb0d
author James Bottomley <James.Bottomley@steeleye.com> 1117955234 -0500
committer James Bottomley <jejb@mulgrave.(none)> 1125243934 -0500

[SCSI] use scatter lists for all block pc requests and simplify hw handlers

Here's the proof of concept for this one.  It converts scsi_wait_req to
do correct REQ_BLOCK_PC submission (and works nicely in my setup).

The final goal should be to eliminate struct scsi_request, but that
can't be done until the character submission paths of sg and st are also
modified.

There's some loss of functionality to this: retries are no longer
controllable (except by setting REQ_FASTFAIL) and the wait_req API needs
to be altered, but it looks very nice.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>