From owner-freebsd-scsi  Fri Jun 22 12: 9:52 2001
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Date: Fri, 22 Jun 2001 12:07:09 -0700 (PDT)
From: Matthew Jacob <mjacob@feral.com>
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To: j mckitrick <jcm@FreeBSD-uk.eu.org>
Cc: <scsi@freebsd.org>
Subject: Re: how to invalidate scsi connection to driver module
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On Fri, 22 Jun 2001, j mckitrick wrote:

>
> Here is the code for a scsi removable media drive.  If this is to become a
> module, the cam/scsi attachment must be removed.  I have tried calling
> cam_sim_free() and xpt_bus_deregister() but when the module is reloaded, the
> cam system assigns the next higher minor device number, and then crashes
> when accessed.  Any ideas here how to reset cam to a state where it knows
> nothing about the device?

The xpt_bus_deregister is supposed to do an AC_LOST_DEVICE on all attached
devices. I don't remember what is supposed to happen to recycle unit
numbers....

Take a look at camperiphunit- it really should recycle unit numbers if the old
ones have truly gone away.


>
>
>
>        /*
>         **      Now tell the generic SCSI layer
>         **      about our bus.
>         */
>         devq = cam_simq_alloc(/*maxopenings*/1);
>         /* XXX What about low-level detach on error? */
>         if (devq == NULL)
>                 return (ENXIO);
>
>         vpo->sim = cam_sim_alloc(vpo_action, vpo_poll, "vpo", vpo,
>                                  device_get_unit(dev),
>                                  /*untagged*/1, /*tagged*/0, devq);
>         if (vpo->sim == NULL) {
>                 cam_simq_free(devq);
>                 return (ENXIO);
>         }
>
>         if (xpt_bus_register(vpo->sim, /*bus*/0) != CAM_SUCCESS) {
>                 cam_sim_free(vpo->sim, /*free_devq*/TRUE);
>                 return (ENXIO);
>         }
>
>         /* all went ok */
>
>         vpo_cam_rescan(vpo);    /* have CAM rescan the bus */
>
>         return (0);
>
> Jonathon
> --
> Microsoft complaining about the source license used by
> Linux is like the event horizon calling the kettle black.
>
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