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[dm-devel] Re: [PATCH 4/9] scsi_dh: add skeleton for SCSI Device Handlers



On Fri, 2008-02-01 at 13:53 -0600, Mike Christie wrote:
> Chandra Seetharaman wrote:
> >  	 * mainly associated with tapes and returned SUCCESS.
> > Index: linux-2.6.24-rc8/drivers/scsi/scsi_sysfs.c
> > ===================================================================
> > --- linux-2.6.24-rc8.orig/drivers/scsi/scsi_sysfs.c
> > +++ linux-2.6.24-rc8/drivers/scsi/scsi_sysfs.c
> > @@ -951,6 +951,49 @@ int scsi_register_interface(struct class
> >  }
> >  EXPORT_SYMBOL(scsi_register_interface);
> >  
> > +static int scsi_dh_notifier_add(struct device *dev, void *data)
> > +{
> > +	struct scsi_device_handler *sdev_dh = data;
> > +
> > +	sdev_dh->nb.notifier_call(&sdev_dh->nb, BUS_NOTIFY_ADD_DEVICE, dev);
> > +
> > +	return 0;
> > +}
> > +
> > +int scsi_register_device_handler(struct scsi_device_handler *sdev_dh)
> > +{
> > +	int ret;
> > +
> > +	ret = bus_register_notifier(&scsi_bus_type, &sdev_dh->nb);
> > +
> > +	bus_for_each_dev(&scsi_bus_type, NULL, sdev_dh, scsi_dh_notifier_add);
> > +
> > +	return ret;
> > +}
> > +EXPORT_SYMBOL(scsi_register_device_handler);
> > +
> > +static int scsi_dh_notifier_remove(struct device *dev, void *data)
> > +{
> > +	struct scsi_device_handler *sdev_dh = data;
> > +
> > +	sdev_dh->nb.notifier_call(&sdev_dh->nb, BUS_NOTIFY_DEL_DEVICE, dev);
> > +
> > +	return 0;
> > +}
> > +
> > +int scsi_unregister_device_handler(struct scsi_device_handler *sdev_dh)
> > +{
> > +	int ret;
> > +
> > +	ret = bus_unregister_notifier(&scsi_bus_type, &sdev_dh->nb);
> > +
> > +	bus_for_each_dev(&scsi_bus_type, NULL, sdev_dh,
> > +					scsi_dh_notifier_remove);
> > +
> > +	return ret;
> > +}
> > +EXPORT_SYMBOL(scsi_unregister_device_handler);
> > +
> 
> Did this end up solving the problem I was hitting where when using the 
> other driver model stuff like is used with the SCSI upper layer drivers. 
> The problem where the hw handler module had to be loaded before finding 
> devices and had to be loaded before sd.c?

Yes, As andmike pointed, it is coded and tested.

It works in both cases, module being inserted before sd is probed and
module inserted after sd.


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-- 

----------------------------------------------------------------------
    Chandra Seetharaman               | Be careful what you choose....
              - sekharan us ibm com   |      .......you may get it.
----------------------------------------------------------------------



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