Date: Fri, 22 Jun 2001 12:07:09 -0700 (PDT) From: Matthew Jacob <mjacob@feral.com> To: j mckitrick <jcm@FreeBSD-uk.eu.org> Cc: <scsi@freebsd.org> Subject: Re: how to invalidate scsi connection to driver module Message-ID: <20010622120232.B20923-100000@wonky.feral.com> In-Reply-To: <20010622183909.A60256@dogma.freebsd-uk.eu.org>
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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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