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[dm-devel] Re: [PATCH 1/9] scsi_dh: Implement common device table handling



Other than one minor issue the code looks good (sorry for the late
realization on my part).

Issue: scsi_dh_handler_detach() references scsi_dh with no check for
null and scsi_dh_notifier() call it with scsi_dh == NULL. code can be
changed to get the device handler from sdev.

With this change IACK

Acked-by: Chandra Seetharaman <sekharan us ibm com>

On Tue, 2008-06-24 at 12:03 +0200, Hannes Reinecke wrote:
> Instead of having each and every driver implement its own
> device table scanning code we should rather implement a common
> routine and scan the device tables there.
> This allows us also to implement a general notifier chain
> callback for all device handler instead for one per handler.
> 
> Signed-off-by: Hannes Reinecke <hare suse de>
> ---
>  drivers/scsi/device_handler/scsi_dh.c       |  199 ++++++++++++++++++++++-----
>  drivers/scsi/device_handler/scsi_dh_emc.c   |   92 +++++--------
>  drivers/scsi/device_handler/scsi_dh_hp_sw.c |   85 +++++-------
>  drivers/scsi/device_handler/scsi_dh_rdac.c  |  106 ++++++---------
>  include/scsi/scsi_device.h                  |    9 +-
>  5 files changed, 289 insertions(+), 202 deletions(-)
> 
> diff --git a/drivers/scsi/device_handler/scsi_dh.c b/drivers/scsi/device_handler/scsi_dh.c
> index ab6c21c..21cd645 100644
> --- a/drivers/scsi/device_handler/scsi_dh.c
> +++ b/drivers/scsi/device_handler/scsi_dh.c
> @@ -33,7 +33,7 @@ static struct scsi_device_handler *get_device_handler(const char *name)
> 
>  	spin_lock(&list_lock);
>  	list_for_each_entry(tmp, &scsi_dh_list, list) {
> -		if (!strcmp(tmp->name, name)) {
> +		if (!strncmp(tmp->name, name, strlen(tmp->name))) {
>  			found = tmp;
>  			break;
>  		}
> @@ -42,51 +42,170 @@ static struct scsi_device_handler *get_device_handler(const char *name)
>  	return found;
>  }
> 
> -static int scsi_dh_notifier_add(struct device *dev, void *data)
> +static int device_handler_match(struct scsi_device_handler *tmp,
> +				struct scsi_device *sdev)
>  {
> -	struct scsi_device_handler *scsi_dh = data;
> +	int i;
> +
> +	for(i = 0; tmp->devlist[i].vendor; i++) {
> +		if (!strncmp(sdev->vendor, tmp->devlist[i].vendor,
> +			     strlen(tmp->devlist[i].vendor)) &&
> +		    !strncmp(sdev->model, tmp->devlist[i].model,
> +			     strlen(tmp->devlist[i].model))) {
> +			return 1;
> +		}
> +	}
> 
> -	scsi_dh->nb.notifier_call(&scsi_dh->nb, BUS_NOTIFY_ADD_DEVICE, dev);
>  	return 0;
>  }
> 
>  /*
> - * scsi_register_device_handler - register a device handler personality
> - *      module.
> - * @scsi_dh - device handler to be registered.
> + * scsi_dh_handler_attach - Attach a device handler to a device
> + * @sdev - SCSI device the device handler should attach to
> + * @scsi_dh - The device handler to attach
> + */
> +static int scsi_dh_handler_attach(struct scsi_device *sdev,
> +				  struct scsi_device_handler *scsi_dh)
> +{
> +	int err = 0;
> +
> +	if (sdev->scsi_dh_data) {
> +		if (sdev->scsi_dh_data->scsi_dh != scsi_dh)
> +			err = -EBUSY;
> +	} else if (scsi_dh->attach)
> +		err = scsi_dh->attach(sdev);
> +
> +	return err;
> +}
> +
> +/*
> + * scsi_dh_handler_detach - Detach a device handler from a device
> + * @sdev - SCSI device the device handler should be detached from
> + * @scsi_dh - Device handler to be detached
>   *
> - * Returns 0 on success, -EBUSY if handler already registered.
> + * Detach from a device handler. If a device handler is specified,
> + * only detach if the currently attached handler is equal to it.
>   */
> -int scsi_register_device_handler(struct scsi_device_handler *scsi_dh)
> +static void scsi_dh_handler_detach(struct scsi_device *sdev,
> +				   struct scsi_device_handler *scsi_dh)
>  {
> -	int ret = -EBUSY;
> -	struct scsi_device_handler *tmp;
> +	if (!sdev->scsi_dh_data)
> +		return;
> 
> -	tmp = get_device_handler(scsi_dh->name);
> -	if (tmp)
> -		goto done;
> +	if (scsi_dh && scsi_dh != sdev->scsi_dh_data->scsi_dh)
> +		return;
> 
> -	ret = bus_register_notifier(&scsi_bus_type, &scsi_dh->nb);
> +	if (scsi_dh->detach)
> +		scsi_dh->detach(sdev);
> +}
> +
> +/*
> + * scsi_dh_notifier - notifier chain callback
> + */
> +static int scsi_dh_notifier(struct notifier_block *nb,
> +			    unsigned long action, void *data)
> +{
> +	struct device *dev = data;
> +	struct scsi_device *sdev;
> +	int err = 0;
> +	struct scsi_device_handler *tmp, *devinfo = NULL;
> +
> +	if (!scsi_is_sdev_device(dev))
> +		return 0;
> +
> +	sdev = to_scsi_device(dev);
> 
> -	bus_for_each_dev(&scsi_bus_type, NULL, scsi_dh, scsi_dh_notifier_add);
>  	spin_lock(&list_lock);
> -	list_add(&scsi_dh->list, &scsi_dh_list);
> +	list_for_each_entry(tmp, &scsi_dh_list, list) {
> +		if (device_handler_match(tmp, sdev)) {
> +			devinfo = tmp;
> +			break;
> +		}
> +	}
>  	spin_unlock(&list_lock);
> 
> -done:
> -	return ret;
> +	if (!devinfo)
> +		goto out;
> +
> +	if (action == BUS_NOTIFY_ADD_DEVICE) {
> +		err = scsi_dh_handler_attach(sdev, devinfo);
> +	} else if (action == BUS_NOTIFY_DEL_DEVICE) {
> +		scsi_dh_handler_detach(sdev, NULL);
> +	}
> +out:
> +	return err;
>  }
> -EXPORT_SYMBOL_GPL(scsi_register_device_handler);
> 
> +/*
> + * scsi_dh_notifier_add - Callback for scsi_register_device_handler
> + */
> +static int scsi_dh_notifier_add(struct device *dev, void *data)
> +{
> +	struct scsi_device_handler *scsi_dh = data;
> +	struct scsi_device *sdev;
> +
> +	if (!scsi_is_sdev_device(dev))
> +		return 0;
> +
> +	if (!get_device(dev))
> +		return 0;
> +
> +	sdev = to_scsi_device(dev);
> +
> +	if (device_handler_match(scsi_dh, sdev))
> +		scsi_dh_handler_attach(sdev, scsi_dh);
> +
> +	put_device(dev);
> +
> +	return 0;
> +}
> +
> +/*
> + * scsi_dh_notifier_remove - Callback for scsi_unregister_device_handler
> + */
>  static int scsi_dh_notifier_remove(struct device *dev, void *data)
>  {
>  	struct scsi_device_handler *scsi_dh = data;
> +	struct scsi_device *sdev;
> +
> +	if (!scsi_is_sdev_device(dev))
> +		return 0;
> +
> +	if (!get_device(dev))
> +		return 0;
> +
> +	sdev = to_scsi_device(dev);
> +
> +	scsi_dh_handler_detach(sdev, scsi_dh);
> +
> +	put_device(dev);
> 
> -	scsi_dh->nb.notifier_call(&scsi_dh->nb, BUS_NOTIFY_DEL_DEVICE, dev);
>  	return 0;
>  }
> 
>  /*
> + * scsi_register_device_handler - register a device handler personality
> + *      module.
> + * @scsi_dh - device handler to be registered.
> + *
> + * Returns 0 on success, -EBUSY if handler already registered.
> + */
> +int scsi_register_device_handler(struct scsi_device_handler *scsi_dh)
> +{
> +	if (get_device_handler(scsi_dh->name))
> +		return -EBUSY;
> +
> +	spin_lock(&list_lock);
> +	list_add(&scsi_dh->list, &scsi_dh_list);
> +	spin_unlock(&list_lock);
> +	bus_for_each_dev(&scsi_bus_type, NULL, scsi_dh, scsi_dh_notifier_add);
> +	printk(KERN_INFO "%s: device handler registered\n", scsi_dh->name);
> +
> +	return SCSI_DH_OK;
> +}
> +EXPORT_SYMBOL_GPL(scsi_register_device_handler);
> +
> +/*
>   * scsi_unregister_device_handler - register a device handler personality
>   *      module.
>   * @scsi_dh - device handler to be unregistered.
> @@ -95,23 +214,18 @@ static int scsi_dh_notifier_remove(struct device *dev, void *data)
>   */
>  int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh)
>  {
> -	int ret = -ENODEV;
> -	struct scsi_device_handler *tmp;
> -
> -	tmp = get_device_handler(scsi_dh->name);
> -	if (!tmp)
> -		goto done;
> -
> -	ret = bus_unregister_notifier(&scsi_bus_type, &scsi_dh->nb);
> +	if (!get_device_handler(scsi_dh->name))
> +		return -ENODEV;
> 
>  	bus_for_each_dev(&scsi_bus_type, NULL, scsi_dh,
> -					scsi_dh_notifier_remove);
> +			 scsi_dh_notifier_remove);
> +
>  	spin_lock(&list_lock);
>  	list_del(&scsi_dh->list);
>  	spin_unlock(&list_lock);
> +	printk(KERN_INFO "%s: device handler unregistered\n", scsi_dh->name);
> 
> -done:
> -	return ret;
> +	return SCSI_DH_OK;
>  }
>  EXPORT_SYMBOL_GPL(scsi_unregister_device_handler);
> 
> @@ -157,6 +271,27 @@ int scsi_dh_handler_exist(const char *name)
>  }
>  EXPORT_SYMBOL_GPL(scsi_dh_handler_exist);
> 
> +static struct notifier_block scsi_dh_nb = {
> +	.notifier_call = scsi_dh_notifier
> +};
> +
> +static int __init scsi_dh_init(void)
> +{
> +	int r;
> +
> +	r = bus_register_notifier(&scsi_bus_type, &scsi_dh_nb);
> +
> +	return r;
> +}
> +
> +static void __exit scsi_dh_exit(void)
> +{
> +	bus_unregister_notifier(&scsi_bus_type, &scsi_dh_nb);
> +}
> +
> +module_init(scsi_dh_init);
> +module_exit(scsi_dh_exit);
> +
>  MODULE_DESCRIPTION("SCSI device handler");
>  MODULE_AUTHOR("Chandra Seetharaman <sekharan us ibm com>");
>  MODULE_LICENSE("GPL");
> diff --git a/drivers/scsi/device_handler/scsi_dh_emc.c b/drivers/scsi/device_handler/scsi_dh_emc.c
> index ed53f14..8a20eb2 100644
> --- a/drivers/scsi/device_handler/scsi_dh_emc.c
> +++ b/drivers/scsi/device_handler/scsi_dh_emc.c
> @@ -390,21 +390,21 @@ static int clariion_check_sense(struct scsi_device *sdev,
>  	return SUCCESS;
>  }
> 
> -static const struct {
> -	char *vendor;
> -	char *model;
> -} clariion_dev_list[] = {
> +const struct scsi_dh_devlist clariion_dev_list[] = {
>  	{"DGC", "RAID"},
>  	{"DGC", "DISK"},
>  	{NULL, NULL},
>  };
> 
> -static int clariion_bus_notify(struct notifier_block *, unsigned long, void *);
> +static int clariion_bus_attach(struct scsi_device *sdev);
> +static void clariion_bus_detach(struct scsi_device *sdev);
> 
>  static struct scsi_device_handler clariion_dh = {
>  	.name		= CLARIION_NAME,
>  	.module		= THIS_MODULE,
> -	.nb.notifier_call = clariion_bus_notify,
> +	.devlist	= clariion_dev_list,
> +	.attach		= clariion_bus_attach,
> +	.detach		= clariion_bus_detach,
>  	.check_sense	= clariion_check_sense,
>  	.activate	= clariion_activate,
>  };
> @@ -412,68 +412,50 @@ static struct scsi_device_handler clariion_dh = {
>  /*
>   * TODO: need some interface so we can set trespass values
>   */
> -static int clariion_bus_notify(struct notifier_block *nb,
> -				unsigned long action, void *data)
> +static int clariion_bus_attach(struct scsi_device *sdev)
>  {
> -	struct device *dev = data;
> -	struct scsi_device *sdev = to_scsi_device(dev);
>  	struct scsi_dh_data *scsi_dh_data;
>  	struct clariion_dh_data *h;
> -	int i, found = 0;
>  	unsigned long flags;
> 
> -	if (action == BUS_NOTIFY_ADD_DEVICE) {
> -		for (i = 0; clariion_dev_list[i].vendor; i++) {
> -			if (!strncmp(sdev->vendor, clariion_dev_list[i].vendor,
> -				     strlen(clariion_dev_list[i].vendor)) &&
> -			    !strncmp(sdev->model, clariion_dev_list[i].model,
> -				     strlen(clariion_dev_list[i].model))) {
> -				found = 1;
> -				break;
> -			}
> -		}
> -		if (!found)
> -			goto out;
> -
> -		scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
> -				+ sizeof(*h) , GFP_KERNEL);
> -		if (!scsi_dh_data) {
> -			sdev_printk(KERN_ERR, sdev, "Attach failed %s.\n",
> -				    CLARIION_NAME);
> -			goto out;
> -		}
> +	scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
> +			       + sizeof(*h) , GFP_KERNEL);
> +	if (!scsi_dh_data) {
> +		sdev_printk(KERN_ERR, sdev, "Attach failed %s.\n",
> +			    CLARIION_NAME);
> +		return -ENOMEM;
> +	}
> 
> -		scsi_dh_data->scsi_dh = &clariion_dh;
> -		h = (struct clariion_dh_data *) scsi_dh_data->buf;
> -		h->default_sp = CLARIION_UNBOUND_LU;
> -		h->current_sp = CLARIION_UNBOUND_LU;
> +	scsi_dh_data->scsi_dh = &clariion_dh;
> +	h = (struct clariion_dh_data *) scsi_dh_data->buf;
> +	h->default_sp = CLARIION_UNBOUND_LU;
> +	h->current_sp = CLARIION_UNBOUND_LU;
> 
> -		spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
> -		sdev->scsi_dh_data = scsi_dh_data;
> -		spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
> +	spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
> +	sdev->scsi_dh_data = scsi_dh_data;
> +	spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
> 
> -		sdev_printk(KERN_NOTICE, sdev, "Attached %s.\n", CLARIION_NAME);
> -		try_module_get(THIS_MODULE);
> +	sdev_printk(KERN_NOTICE, sdev, "Attached %s.\n", CLARIION_NAME);
> +	try_module_get(THIS_MODULE);
> 
> -	} else if (action == BUS_NOTIFY_DEL_DEVICE) {
> -		if (sdev->scsi_dh_data == NULL ||
> -				sdev->scsi_dh_data->scsi_dh != &clariion_dh)
> -			goto out;
> +	return 0;
> +}
> 
> -		spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
> -		scsi_dh_data = sdev->scsi_dh_data;
> -		sdev->scsi_dh_data = NULL;
> -		spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
> +static void clariion_bus_detach(struct scsi_device *sdev)
> +{
> +	struct scsi_dh_data *scsi_dh_data;
> +	unsigned long flags;
> 
> -		sdev_printk(KERN_NOTICE, sdev, "Dettached %s.\n",
> -			    CLARIION_NAME);
> +	spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
> +	scsi_dh_data = sdev->scsi_dh_data;
> +	sdev->scsi_dh_data = NULL;
> +	spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
> 
> -		kfree(scsi_dh_data);
> -		module_put(THIS_MODULE);
> -	}
> +	sdev_printk(KERN_NOTICE, sdev, "Detached %s.\n",
> +		    CLARIION_NAME);
> 
> -out:
> -	return 0;
> +	kfree(scsi_dh_data);
> +	module_put(THIS_MODULE);
>  }
> 
>  static int __init clariion_init(void)
> diff --git a/drivers/scsi/device_handler/scsi_dh_hp_sw.c b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
> index 12ceab7..78259bc 100644
> --- a/drivers/scsi/device_handler/scsi_dh_hp_sw.c
> +++ b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
> @@ -108,80 +108,63 @@ done:
>  	return ret;
>  }
> 
> -static const struct {
> -	char *vendor;
> -	char *model;
> -} hp_sw_dh_data_list[] = {
> +const struct scsi_dh_devlist hp_sw_dh_data_list[] = {
>  	{"COMPAQ", "MSA"},
>  	{"HP", "HSV"},
>  	{"DEC", "HSG80"},
>  	{NULL, NULL},
>  };
> 
> -static int hp_sw_bus_notify(struct notifier_block *, unsigned long, void *);
> +static int hp_sw_bus_attach(struct scsi_device *sdev);
> +static void hp_sw_bus_detach(struct scsi_device *sdev);
> 
>  static struct scsi_device_handler hp_sw_dh = {
>  	.name		= HP_SW_NAME,
>  	.module		= THIS_MODULE,
> -	.nb.notifier_call = hp_sw_bus_notify,
> +	.devlist	= hp_sw_dh_data_list,
> +	.attach		= hp_sw_bus_attach,
> +	.detach		= hp_sw_bus_detach,
>  	.activate	= hp_sw_activate,
>  };
> 
> -static int hp_sw_bus_notify(struct notifier_block *nb,
> -			    unsigned long action, void *data)
> +static int hp_sw_bus_attach(struct scsi_device *sdev)
>  {
> -	struct device *dev = data;
> -	struct scsi_device *sdev = to_scsi_device(dev);
>  	struct scsi_dh_data *scsi_dh_data;
> -	int i, found = 0;
>  	unsigned long flags;
> 
> -	if (action == BUS_NOTIFY_ADD_DEVICE) {
> -		for (i = 0; hp_sw_dh_data_list[i].vendor; i++) {
> -			if (!strncmp(sdev->vendor, hp_sw_dh_data_list[i].vendor,
> -				     strlen(hp_sw_dh_data_list[i].vendor)) &&
> -			    !strncmp(sdev->model, hp_sw_dh_data_list[i].model,
> -				     strlen(hp_sw_dh_data_list[i].model))) {
> -				found = 1;
> -				break;
> -			}
> -		}
> -		if (!found)
> -			goto out;
> -
> -		scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
> -				+ sizeof(struct hp_sw_dh_data) , GFP_KERNEL);
> -		if (!scsi_dh_data) {
> -			sdev_printk(KERN_ERR, sdev, "Attach Failed %s.\n",
> -				    HP_SW_NAME);
> -			goto out;
> -		}
> +	scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
> +			       + sizeof(struct hp_sw_dh_data) , GFP_KERNEL);
> +	if (!scsi_dh_data) {
> +		sdev_printk(KERN_ERR, sdev, "Attach Failed %s.\n",
> +			    HP_SW_NAME);
> +		return 0;
> +	}
> 
> -		scsi_dh_data->scsi_dh = &hp_sw_dh;
> -		spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
> -		sdev->scsi_dh_data = scsi_dh_data;
> -		spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
> -		try_module_get(THIS_MODULE);
> +	scsi_dh_data->scsi_dh = &hp_sw_dh;
> +	spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
> +	sdev->scsi_dh_data = scsi_dh_data;
> +	spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
> +	try_module_get(THIS_MODULE);
> 
> -		sdev_printk(KERN_NOTICE, sdev, "Attached %s.\n", HP_SW_NAME);
> -	} else if (action == BUS_NOTIFY_DEL_DEVICE) {
> -		if (sdev->scsi_dh_data == NULL ||
> -				sdev->scsi_dh_data->scsi_dh != &hp_sw_dh)
> -			goto out;
> +	sdev_printk(KERN_NOTICE, sdev, "Attached %s.\n", HP_SW_NAME);
> 
> -		spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
> -		scsi_dh_data = sdev->scsi_dh_data;
> -		sdev->scsi_dh_data = NULL;
> -		spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
> -		module_put(THIS_MODULE);
> +	return 0;
> +}
> 
> -		sdev_printk(KERN_NOTICE, sdev, "Dettached %s.\n", HP_SW_NAME);
> +static void hp_sw_bus_detach( struct scsi_device *sdev )
> +{
> +	struct scsi_dh_data *scsi_dh_data;
> +	unsigned long flags;
> 
> -		kfree(scsi_dh_data);
> -	}
> +	spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
> +	scsi_dh_data = sdev->scsi_dh_data;
> +	sdev->scsi_dh_data = NULL;
> +	spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
> +	module_put(THIS_MODULE);
> 
> -out:
> -	return 0;
> +	sdev_printk(KERN_NOTICE, sdev, "Detached %s\n", HP_SW_NAME);
> +
> +	kfree(scsi_dh_data);
>  }
> 
>  static int __init hp_sw_init(void)
> diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
> index 6fff077..e61cde6 100644
> --- a/drivers/scsi/device_handler/scsi_dh_rdac.c
> +++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
> @@ -569,10 +569,7 @@ static int rdac_check_sense(struct scsi_device *sdev,
>  	return SCSI_RETURN_NOT_HANDLED;
>  }
> 
> -static const struct {
> -	char *vendor;
> -	char *model;
> -} rdac_dev_list[] = {
> +const struct scsi_dh_devlist rdac_dev_list[] = {
>  	{"IBM", "1722"},
>  	{"IBM", "1724"},
>  	{"IBM", "1726"},
> @@ -590,84 +587,67 @@ static const struct {
>  	{NULL, NULL},
>  };
> 
> -static int rdac_bus_notify(struct notifier_block *, unsigned long, void *);
> +static int rdac_bus_attach(struct scsi_device *sdev);
> +static void rdac_bus_detach(struct scsi_device *sdev);
> 
>  static struct scsi_device_handler rdac_dh = {
>  	.name = RDAC_NAME,
>  	.module = THIS_MODULE,
> -	.nb.notifier_call = rdac_bus_notify,
> +	.devlist = rdac_dev_list,
>  	.prep_fn = rdac_prep_fn,
>  	.check_sense = rdac_check_sense,
> +	.attach = rdac_bus_attach,
> +	.detach = rdac_bus_detach,
>  	.activate = rdac_activate,
>  };
> 
> -/*
> - * TODO: need some interface so we can set trespass values
> - */
> -static int rdac_bus_notify(struct notifier_block *nb,
> -			    unsigned long action, void *data)
> +static int rdac_bus_attach(struct scsi_device *sdev)
>  {
> -	struct device *dev = data;
> -	struct scsi_device *sdev = to_scsi_device(dev);
>  	struct scsi_dh_data *scsi_dh_data;
>  	struct rdac_dh_data *h;
> -	int i, found = 0;
>  	unsigned long flags;
> 
> -	if (action == BUS_NOTIFY_ADD_DEVICE) {
> -		for (i = 0; rdac_dev_list[i].vendor; i++) {
> -			if (!strncmp(sdev->vendor, rdac_dev_list[i].vendor,
> -				     strlen(rdac_dev_list[i].vendor)) &&
> -			    !strncmp(sdev->model, rdac_dev_list[i].model,
> -				     strlen(rdac_dev_list[i].model))) {
> -				found = 1;
> -				break;
> -			}
> -		}
> -		if (!found)
> -			goto out;
> -
> -		scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
> -				+ sizeof(*h) , GFP_KERNEL);
> -		if (!scsi_dh_data) {
> -			sdev_printk(KERN_ERR, sdev, "Attach failed %s.\n",
> -				    RDAC_NAME);
> -			goto out;
> -		}
> -
> -		scsi_dh_data->scsi_dh = &rdac_dh;
> -		h = (struct rdac_dh_data *) scsi_dh_data->buf;
> -		h->lun = UNINITIALIZED_LUN;
> -		h->state = RDAC_STATE_ACTIVE;
> -		spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
> -		sdev->scsi_dh_data = scsi_dh_data;
> -		spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
> -		try_module_get(THIS_MODULE);
> -
> -		sdev_printk(KERN_NOTICE, sdev, "Attached %s.\n", RDAC_NAME);
> -
> -	} else if (action == BUS_NOTIFY_DEL_DEVICE) {
> -		if (sdev->scsi_dh_data == NULL ||
> -				sdev->scsi_dh_data->scsi_dh != &rdac_dh)
> -			goto out;
> -
> -		spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
> -		scsi_dh_data = sdev->scsi_dh_data;
> -		sdev->scsi_dh_data = NULL;
> -		spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
> -
> -		h = (struct rdac_dh_data *) scsi_dh_data->buf;
> -		if (h->ctlr)
> -			kref_put(&h->ctlr->kref, release_controller);
> -		kfree(scsi_dh_data);
> -		module_put(THIS_MODULE);
> -		sdev_printk(KERN_NOTICE, sdev, "Dettached %s.\n", RDAC_NAME);
> +	scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
> +			       + sizeof(*h) , GFP_KERNEL);
> +	if (!scsi_dh_data) {
> +		sdev_printk(KERN_ERR, sdev, "Attach failed %s.\n",
> +			    RDAC_NAME);
> +		return 0;
>  	}
> 
> -out:
> +	scsi_dh_data->scsi_dh = &rdac_dh;
> +	h = (struct rdac_dh_data *) scsi_dh_data->buf;
> +	h->lun = UNINITIALIZED_LUN;
> +	h->state = RDAC_STATE_ACTIVE;
> +	spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
> +	sdev->scsi_dh_data = scsi_dh_data;
> +	spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
> +	try_module_get(THIS_MODULE);
> +
> +	sdev_printk(KERN_NOTICE, sdev, "Attached %s\n", RDAC_NAME);
> +
>  	return 0;
>  }
> 
> +static void rdac_bus_detach( struct scsi_device *sdev )
> +{
> +	struct scsi_dh_data *scsi_dh_data;
> +	struct rdac_dh_data *h;
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
> +	scsi_dh_data = sdev->scsi_dh_data;
> +	sdev->scsi_dh_data = NULL;
> +	spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
> +
> +	h = (struct rdac_dh_data *) scsi_dh_data->buf;
> +	if (h->ctlr)
> +		kref_put(&h->ctlr->kref, release_controller);
> +	kfree(scsi_dh_data);
> +	module_put(THIS_MODULE);
> +	sdev_printk(KERN_NOTICE, sdev, "Detached %s\n", RDAC_NAME);
> +}
> +
>  static int __init rdac_init(void)
>  {
>  	int r;
> diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
> index 06b979f..62ce167 100644
> --- a/include/scsi/scsi_device.h
> +++ b/include/scsi/scsi_device.h
> @@ -166,15 +166,22 @@ struct scsi_device {
>  	unsigned long		sdev_data[0];
>  } __attribute__((aligned(sizeof(unsigned long))));
> 
> +struct scsi_dh_devlist {
> +	char *vendor;
> +	char *model;
> +};
> +
>  struct scsi_device_handler {
>  	/* Used by the infrastructure */
>  	struct list_head list; /* list of scsi_device_handlers */
> -	struct notifier_block nb;
> 
>  	/* Filled by the hardware handler */
>  	struct module *module;
>  	const char *name;
> +	const struct scsi_dh_devlist *devlist;
>  	int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *);
> +	int (*attach)(struct scsi_device *);
> +	void (*detach)(struct scsi_device *);
>  	int (*activate)(struct scsi_device *);
>  	int (*prep_fn)(struct scsi_device *, struct request *);
>  };


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