Firewire disk/tape access stopped working after recent CAM commit

[Kenneth D. Merry]

On Tue, Jan 24, 2012 at 00:03:56 -0600, Richard Todd wrote:
> On Mon, Jan 23, 2012 at 11:16:05AM -0700, Kenneth D. Merry wrote:
> > If you can, please try the attached patch and see if it has any impact on
> > the problem.  There is a bug in that commit in that we shouldn't be
> > invalidating all LUNs on a target when we get a status of
> > CAM_DEV_NOT_THERE.
> 
> Just applied the patch, built new kernel, and rebooted, and all the FW
> drivees are showing up now.  Thanks!

Great!

> > It may be that we need to do a more thorough audit of how various SIM
> > drivers are using the CAM_DEV_NOT_THERE status.
> 
> So I take it the layers for the different hardware (SCSI, FW, USB,
> ATA/AHCI) are handling this status differently, so that's why this bug only
> showed up on the Firewire buses but not on ATA/AHCI, USB, or (on my other 
> machine) SCSI buses? 

Yes.  Some drivers report a selection timeout, some report that the device
isn't there, and they may be using those status values in different
situations.

Ken
-- 
Kenneth Merry
ken at FreeBSD.ORG