Re: [PATCH] allow NULL dev argument to scsi_add_host

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

Andries Brouwer [aebr@win.tue.nl] wrote:
> On Sun, Jan 12, 2003 at 11:40:30AM -0800, Mike Anderson wrote:
> 
> > Currently we have a couple of issues that might be solved by the creation of a
> > scsi subsystem in /sysfs/scsi:
> 
> Is /sysfs/scsi better than /sysfs/devices/scsiX?

The choice was not better it was just a difference of semantics. The
/sysfs/devices tree normal contains devices with an associated bus
(though you can set this to NULL).  The device tree was meant to contain
real devices. The support I added to scsi_debug was to emulate a real
device so the overhead was needed to try to match the call paths of
other LLDD like some of the converted pci's. The addition of ide-scsi to
the device tree was that there was no other option.

I hoped to get a smaller object to represent the emulated scsi hosts or
hosts that had not been converted in a /sysfs/scsi subsystem. I also
thought we might need other sysfs entries related to the SCSI subsystem
(scsi logging control, sg mapping solution, scsiX host mapping "The
scsi-host class I created sucks right now"). 

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