Date:	Mon, 10 Sep 2012 15:07:00 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	ebiederm@...ssion.com
Cc:	netdev@...r.kernel.org, James.Bottomley@...allels.com,
	James.Smart@...lex.Com, linux-scsi@...r.kernel.org
Subject: Re: [PATCH] scsi_netlink: Remove dead and buggy code

From: ebiederm@...ssion.com (Eric W. Biederman)
Date: Fri, 07 Sep 2012 15:39:21 -0700

> 
> The scsi netlink code confuses the netlink port id with a process id,
> going so far as to read NETLINK_CREDS(skb)->pid instead of the correct
> NETLINK_CB(skb).pid.  Fortunately it does not matter because nothing
> registers to respond to scsi netlink requests.
> 
> The only interesting use of the scsi_netlink interface is
> fc_host_post_vendor_event which sends a netlink multicast message.
> 
> Since nothing registers to handle scsi netlink messages kill all of the
> registration logic, while retaining the same error handling behavior
> preserving the userspace visible behavior and removing all of the
> confused code that thought a netlink port id was a process id.
> 
> This was tested with a kernel allyesconfig build which had no problems.
> 
> Cc: James Bottomley <James.Bottomley@...allels.com>
> Cc: James Smart <James.Smart@...lex.Com>
> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>

James et al., please review and ACK.

> ---
>  drivers/scsi/scsi_netlink.c |  555 ++-----------------------------------------
>  include/scsi/scsi_netlink.h |   24 --
>  2 files changed, 15 insertions(+), 564 deletions(-)
> 
> diff --git a/drivers/scsi/scsi_netlink.c b/drivers/scsi/scsi_netlink.c
> index 8818dd6..abd43a3 100644
> --- a/drivers/scsi/scsi_netlink.c
> +++ b/drivers/scsi/scsi_netlink.c
> @@ -33,40 +33,6 @@
>  struct sock *scsi_nl_sock = NULL;
>  EXPORT_SYMBOL_GPL(scsi_nl_sock);
>  
> -static DEFINE_SPINLOCK(scsi_nl_lock);
> -static struct list_head scsi_nl_drivers;
> -
> -static u32	scsi_nl_state;
> -#define STATE_EHANDLER_BSY		0x00000001
> -
> -struct scsi_nl_transport {
> -	int (*msg_handler)(struct sk_buff *);
> -	void (*event_handler)(struct notifier_block *, unsigned long, void *);
> -	unsigned int refcnt;
> -	int flags;
> -};
> -
> -/* flags values (bit flags) */
> -#define HANDLER_DELETING		0x1
> -
> -static struct scsi_nl_transport transports[SCSI_NL_MAX_TRANSPORTS] =
> -	{ {NULL, }, };
> -
> -
> -struct scsi_nl_drvr {
> -	struct list_head next;
> -	int (*dmsg_handler)(struct Scsi_Host *shost, void *payload,
> -				 u32 len, u32 pid);
> -	void (*devt_handler)(struct notifier_block *nb,
> -				 unsigned long event, void *notify_ptr);
> -	struct scsi_host_template *hostt;
> -	u64 vendor_id;
> -	unsigned int refcnt;
> -	int flags;
> -};
> -
> -
> -
>  /**
>   * scsi_nl_rcv_msg - Receive message handler.
>   * @skb:		socket receive buffer
> @@ -81,7 +47,6 @@ scsi_nl_rcv_msg(struct sk_buff *skb)
>  {
>  	struct nlmsghdr *nlh;
>  	struct scsi_nl_hdr *hdr;
> -	unsigned long flags;
>  	u32 rlen;
>  	int err, tport;
>  
> @@ -126,22 +91,24 @@ scsi_nl_rcv_msg(struct sk_buff *skb)
>  		/*
>  		 * Deliver message to the appropriate transport
>  		 */
> -		spin_lock_irqsave(&scsi_nl_lock, flags);
> -
>  		tport = hdr->transport;
> -		if ((tport < SCSI_NL_MAX_TRANSPORTS) &&
> -		    !(transports[tport].flags & HANDLER_DELETING) &&
> -		    (transports[tport].msg_handler)) {
> -			transports[tport].refcnt++;
> -			spin_unlock_irqrestore(&scsi_nl_lock, flags);
> -			err = transports[tport].msg_handler(skb);
> -			spin_lock_irqsave(&scsi_nl_lock, flags);
> -			transports[tport].refcnt--;
> -		} else
> +		if (tport == SCSI_NL_TRANSPORT) {
> +			switch (hdr->msgtype) {
> +			case SCSI_NL_SHOST_VENDOR:
> +				/* Locate the driver that corresponds to the message */
> +				err = -ESRCH;
> +				break;
> +			default:
> +				err = -EBADR;
> +				break;
> +			}
> +			if (err)
> +				printk(KERN_WARNING "%s: Msgtype %d failed - err %d\n",
> +				       __func__, hdr->msgtype, err);
> +		}
> +		else
>  			err = -ENOENT;
>  
> -		spin_unlock_irqrestore(&scsi_nl_lock, flags);
> -
>  next_msg:
>  		if ((err) || (nlh->nlmsg_flags & NLM_F_ACK))
>  			netlink_ack(skb, nlh, err);
> @@ -150,333 +117,6 @@ next_msg:
>  	}
>  }
>  
> -
> -/**
> - * scsi_nl_rcv_event - Event handler for a netlink socket.
> - * @this:		event notifier block
> - * @event:		event type
> - * @ptr:		event payload
> - *
> - **/
> -static int
> -scsi_nl_rcv_event(struct notifier_block *this, unsigned long event, void *ptr)
> -{
> -	struct netlink_notify *n = ptr;
> -	struct scsi_nl_drvr *driver;
> -	unsigned long flags;
> -	int tport;
> -
> -	if (n->protocol != NETLINK_SCSITRANSPORT)
> -		return NOTIFY_DONE;
> -
> -	spin_lock_irqsave(&scsi_nl_lock, flags);
> -	scsi_nl_state |= STATE_EHANDLER_BSY;
> -
> -	/*
> -	 * Pass event on to any transports that may be listening
> -	 */
> -	for (tport = 0; tport < SCSI_NL_MAX_TRANSPORTS; tport++) {
> -		if (!(transports[tport].flags & HANDLER_DELETING) &&
> -		    (transports[tport].event_handler)) {
> -			spin_unlock_irqrestore(&scsi_nl_lock, flags);
> -			transports[tport].event_handler(this, event, ptr);
> -			spin_lock_irqsave(&scsi_nl_lock, flags);
> -		}
> -	}
> -
> -	/*
> -	 * Pass event on to any drivers that may be listening
> -	 */
> -	list_for_each_entry(driver, &scsi_nl_drivers, next) {
> -		if (!(driver->flags & HANDLER_DELETING) &&
> -		    (driver->devt_handler)) {
> -			spin_unlock_irqrestore(&scsi_nl_lock, flags);
> -			driver->devt_handler(this, event, ptr);
> -			spin_lock_irqsave(&scsi_nl_lock, flags);
> -		}
> -	}
> -
> -	scsi_nl_state &= ~STATE_EHANDLER_BSY;
> -	spin_unlock_irqrestore(&scsi_nl_lock, flags);
> -
> -	return NOTIFY_DONE;
> -}
> -
> -static struct notifier_block scsi_netlink_notifier = {
> -	.notifier_call  = scsi_nl_rcv_event,
> -};
> -
> -
> -/*
> - * GENERIC SCSI transport receive and event handlers
> - */
> -
> -/**
> - * scsi_generic_msg_handler - receive message handler for GENERIC transport messages
> - * @skb:		socket receive buffer
> - **/
> -static int
> -scsi_generic_msg_handler(struct sk_buff *skb)
> -{
> -	struct nlmsghdr *nlh = nlmsg_hdr(skb);
> -	struct scsi_nl_hdr *snlh = NLMSG_DATA(nlh);
> -	struct scsi_nl_drvr *driver;
> -	struct Scsi_Host *shost;
> -	unsigned long flags;
> -	int err = 0, match, pid;
> -
> -	pid = NETLINK_CREDS(skb)->pid;
> -
> -	switch (snlh->msgtype) {
> -	case SCSI_NL_SHOST_VENDOR:
> -		{
> -		struct scsi_nl_host_vendor_msg *msg = NLMSG_DATA(nlh);
> -
> -		/* Locate the driver that corresponds to the message */
> -		spin_lock_irqsave(&scsi_nl_lock, flags);
> -		match = 0;
> -		list_for_each_entry(driver, &scsi_nl_drivers, next) {
> -			if (driver->vendor_id == msg->vendor_id) {
> -				match = 1;
> -				break;
> -			}
> -		}
> -
> -		if ((!match) || (!driver->dmsg_handler)) {
> -			spin_unlock_irqrestore(&scsi_nl_lock, flags);
> -			err = -ESRCH;
> -			goto rcv_exit;
> -		}
> -
> -		if (driver->flags & HANDLER_DELETING) {
> -			spin_unlock_irqrestore(&scsi_nl_lock, flags);
> -			err = -ESHUTDOWN;
> -			goto rcv_exit;
> -		}
> -
> -		driver->refcnt++;
> -		spin_unlock_irqrestore(&scsi_nl_lock, flags);
> -
> -
> -		/* if successful, scsi_host_lookup takes a shost reference */
> -		shost = scsi_host_lookup(msg->host_no);
> -		if (!shost) {
> -			err = -ENODEV;
> -			goto driver_exit;
> -		}
> -
> -		/* is this host owned by the vendor ? */
> -		if (shost->hostt != driver->hostt) {
> -			err = -EINVAL;
> -			goto vendormsg_put;
> -		}
> -
> -		/* pass message on to the driver */
> -		err = driver->dmsg_handler(shost, (void *)&msg[1],
> -					 msg->vmsg_datalen, pid);
> -
> -vendormsg_put:
> -		/* release reference by scsi_host_lookup */
> -		scsi_host_put(shost);
> -
> -driver_exit:
> -		/* release our own reference on the registration object */
> -		spin_lock_irqsave(&scsi_nl_lock, flags);
> -		driver->refcnt--;
> -		spin_unlock_irqrestore(&scsi_nl_lock, flags);
> -		break;
> -		}
> -
> -	default:
> -		err = -EBADR;
> -		break;
> -	}
> -
> -rcv_exit:
> -	if (err)
> -		printk(KERN_WARNING "%s: Msgtype %d failed - err %d\n",
> -			 __func__, snlh->msgtype, err);
> -	return err;
> -}
> -
> -
> -/**
> - * scsi_nl_add_transport -
> - *    Registers message and event handlers for a transport. Enables
> - *    receipt of netlink messages and events to a transport.
> - *
> - * @tport:		transport registering handlers
> - * @msg_handler:	receive message handler callback
> - * @event_handler:	receive event handler callback
> - **/
> -int
> -scsi_nl_add_transport(u8 tport,
> -	int (*msg_handler)(struct sk_buff *),
> -	void (*event_handler)(struct notifier_block *, unsigned long, void *))
> -{
> -	unsigned long flags;
> -	int err = 0;
> -
> -	if (tport >= SCSI_NL_MAX_TRANSPORTS)
> -		return -EINVAL;
> -
> -	spin_lock_irqsave(&scsi_nl_lock, flags);
> -
> -	if (scsi_nl_state & STATE_EHANDLER_BSY) {
> -		spin_unlock_irqrestore(&scsi_nl_lock, flags);
> -		msleep(1);
> -		spin_lock_irqsave(&scsi_nl_lock, flags);
> -	}
> -
> -	if (transports[tport].msg_handler || transports[tport].event_handler) {
> -		err = -EALREADY;
> -		goto register_out;
> -	}
> -
> -	transports[tport].msg_handler = msg_handler;
> -	transports[tport].event_handler = event_handler;
> -	transports[tport].flags = 0;
> -	transports[tport].refcnt = 0;
> -
> -register_out:
> -	spin_unlock_irqrestore(&scsi_nl_lock, flags);
> -
> -	return err;
> -}
> -EXPORT_SYMBOL_GPL(scsi_nl_add_transport);
> -
> -
> -/**
> - * scsi_nl_remove_transport -
> - *    Disable transport receiption of messages and events
> - *
> - * @tport:		transport deregistering handlers
> - *
> - **/
> -void
> -scsi_nl_remove_transport(u8 tport)
> -{
> -	unsigned long flags;
> -
> -	spin_lock_irqsave(&scsi_nl_lock, flags);
> -	if (scsi_nl_state & STATE_EHANDLER_BSY) {
> -		spin_unlock_irqrestore(&scsi_nl_lock, flags);
> -		msleep(1);
> -		spin_lock_irqsave(&scsi_nl_lock, flags);
> -	}
> -
> -	if (tport < SCSI_NL_MAX_TRANSPORTS) {
> -		transports[tport].flags |= HANDLER_DELETING;
> -
> -		while (transports[tport].refcnt != 0) {
> -			spin_unlock_irqrestore(&scsi_nl_lock, flags);
> -			schedule_timeout_uninterruptible(HZ/4);
> -			spin_lock_irqsave(&scsi_nl_lock, flags);
> -		}
> -		transports[tport].msg_handler = NULL;
> -		transports[tport].event_handler = NULL;
> -		transports[tport].flags = 0;
> -	}
> -
> -	spin_unlock_irqrestore(&scsi_nl_lock, flags);
> -
> -	return;
> -}
> -EXPORT_SYMBOL_GPL(scsi_nl_remove_transport);
> -
> -
> -/**
> - * scsi_nl_add_driver -
> - *    A driver is registering its interfaces for SCSI netlink messages
> - *
> - * @vendor_id:          A unique identification value for the driver.
> - * @hostt:		address of the driver's host template. Used
> - *			to verify an shost is bound to the driver
> - * @nlmsg_handler:	receive message handler callback
> - * @nlevt_handler:	receive event handler callback
> - *
> - * Returns:
> - *   0 on Success
> - *   error result otherwise
> - **/
> -int
> -scsi_nl_add_driver(u64 vendor_id, struct scsi_host_template *hostt,
> -	int (*nlmsg_handler)(struct Scsi_Host *shost, void *payload,
> -				 u32 len, u32 pid),
> -	void (*nlevt_handler)(struct notifier_block *nb,
> -				 unsigned long event, void *notify_ptr))
> -{
> -	struct scsi_nl_drvr *driver;
> -	unsigned long flags;
> -
> -	driver = kzalloc(sizeof(*driver), GFP_KERNEL);
> -	if (unlikely(!driver)) {
> -		printk(KERN_ERR "%s: allocation failure\n", __func__);
> -		return -ENOMEM;
> -	}
> -
> -	driver->dmsg_handler = nlmsg_handler;
> -	driver->devt_handler = nlevt_handler;
> -	driver->hostt = hostt;
> -	driver->vendor_id = vendor_id;
> -
> -	spin_lock_irqsave(&scsi_nl_lock, flags);
> -	if (scsi_nl_state & STATE_EHANDLER_BSY) {
> -		spin_unlock_irqrestore(&scsi_nl_lock, flags);
> -		msleep(1);
> -		spin_lock_irqsave(&scsi_nl_lock, flags);
> -	}
> -	list_add_tail(&driver->next, &scsi_nl_drivers);
> -	spin_unlock_irqrestore(&scsi_nl_lock, flags);
> -
> -	return 0;
> -}
> -EXPORT_SYMBOL_GPL(scsi_nl_add_driver);
> -
> -
> -/**
> - * scsi_nl_remove_driver -
> - *    An driver is unregistering with the SCSI netlink messages
> - *
> - * @vendor_id:          The unique identification value for the driver.
> - **/
> -void
> -scsi_nl_remove_driver(u64 vendor_id)
> -{
> -	struct scsi_nl_drvr *driver;
> -	unsigned long flags;
> -
> -	spin_lock_irqsave(&scsi_nl_lock, flags);
> -	if (scsi_nl_state & STATE_EHANDLER_BSY) {
> -		spin_unlock_irqrestore(&scsi_nl_lock, flags);
> -		msleep(1);
> -		spin_lock_irqsave(&scsi_nl_lock, flags);
> -	}
> -
> -	list_for_each_entry(driver, &scsi_nl_drivers, next) {
> -		if (driver->vendor_id == vendor_id) {
> -			driver->flags |= HANDLER_DELETING;
> -			while (driver->refcnt != 0) {
> -				spin_unlock_irqrestore(&scsi_nl_lock, flags);
> -				schedule_timeout_uninterruptible(HZ/4);
> -				spin_lock_irqsave(&scsi_nl_lock, flags);
> -			}
> -			list_del(&driver->next);
> -			kfree(driver);
> -			spin_unlock_irqrestore(&scsi_nl_lock, flags);
> -			return;
> -		}
> -	}
> -
> -	spin_unlock_irqrestore(&scsi_nl_lock, flags);
> -
> -	printk(KERN_ERR "%s: removal of driver failed - vendor_id 0x%llx\n",
> -	       __func__, (unsigned long long)vendor_id);
> -	return;
> -}
> -EXPORT_SYMBOL_GPL(scsi_nl_remove_driver);
> -
> -
>  /**
>   * scsi_netlink_init - Called by SCSI subsystem to initialize
>   * 	the SCSI transport netlink interface
> @@ -485,36 +125,19 @@ EXPORT_SYMBOL_GPL(scsi_nl_remove_driver);
>  void
>  scsi_netlink_init(void)
>  {
> -	int error;
>  	struct netlink_kernel_cfg cfg = {
>  		.input	= scsi_nl_rcv_msg,
>  		.groups	= SCSI_NL_GRP_CNT,
>  	};
>  
> -	INIT_LIST_HEAD(&scsi_nl_drivers);
> -
> -	error = netlink_register_notifier(&scsi_netlink_notifier);
> -	if (error) {
> -		printk(KERN_ERR "%s: register of event handler failed - %d\n",
> -				__func__, error);
> -		return;
> -	}
> -
>  	scsi_nl_sock = netlink_kernel_create(&init_net, NETLINK_SCSITRANSPORT,
>  					     THIS_MODULE, &cfg);
>  	if (!scsi_nl_sock) {
>  		printk(KERN_ERR "%s: register of receive handler failed\n",
>  				__func__);
> -		netlink_unregister_notifier(&scsi_netlink_notifier);
>  		return;
>  	}
>  
> -	/* Register the entry points for the generic SCSI transport */
> -	error = scsi_nl_add_transport(SCSI_NL_TRANSPORT,
> -				scsi_generic_msg_handler, NULL);
> -	if (error)
> -		printk(KERN_ERR "%s: register of GENERIC transport handler"
> -				"  failed - %d\n", __func__, error);
>  	return;
>  }
>  
> @@ -526,158 +149,10 @@ scsi_netlink_init(void)
>  void
>  scsi_netlink_exit(void)
>  {
> -	scsi_nl_remove_transport(SCSI_NL_TRANSPORT);
> -
>  	if (scsi_nl_sock) {
>  		netlink_kernel_release(scsi_nl_sock);
> -		netlink_unregister_notifier(&scsi_netlink_notifier);
>  	}
>  
>  	return;
>  }
>  
> -
> -/*
> - * Exported Interfaces
> - */
> -
> -/**
> - * scsi_nl_send_transport_msg -
> - *    Generic function to send a single message from a SCSI transport to
> - *    a single process
> - *
> - * @pid:		receiving pid
> - * @hdr:		message payload
> - *
> - **/
> -void
> -scsi_nl_send_transport_msg(u32 pid, struct scsi_nl_hdr *hdr)
> -{
> -	struct sk_buff *skb;
> -	struct nlmsghdr	*nlh;
> -	const char *fn;
> -	char *datab;
> -	u32 len, skblen;
> -	int err;
> -
> -	if (!scsi_nl_sock) {
> -		err = -ENOENT;
> -		fn = "netlink socket";
> -		goto msg_fail;
> -	}
> -
> -	len = NLMSG_SPACE(hdr->msglen);
> -	skblen = NLMSG_SPACE(len);
> -
> -	skb = alloc_skb(skblen, GFP_KERNEL);
> -	if (!skb) {
> -		err = -ENOBUFS;
> -		fn = "alloc_skb";
> -		goto msg_fail;
> -	}
> -
> -	nlh = nlmsg_put(skb, pid, 0, SCSI_TRANSPORT_MSG, len - sizeof(*nlh), 0);
> -	if (!nlh) {
> -		err = -ENOBUFS;
> -		fn = "nlmsg_put";
> -		goto msg_fail_skb;
> -	}
> -	datab = NLMSG_DATA(nlh);
> -	memcpy(datab, hdr, hdr->msglen);
> -
> -	err = nlmsg_unicast(scsi_nl_sock, skb, pid);
> -	if (err < 0) {
> -		fn = "nlmsg_unicast";
> -		/* nlmsg_unicast already kfree_skb'd */
> -		goto msg_fail;
> -	}
> -
> -	return;
> -
> -msg_fail_skb:
> -	kfree_skb(skb);
> -msg_fail:
> -	printk(KERN_WARNING
> -		"%s: Dropped Message : pid %d Transport %d, msgtype x%x, "
> -		"msglen %d: %s : err %d\n",
> -		__func__, pid, hdr->transport, hdr->msgtype, hdr->msglen,
> -		fn, err);
> -	return;
> -}
> -EXPORT_SYMBOL_GPL(scsi_nl_send_transport_msg);
> -
> -
> -/**
> - * scsi_nl_send_vendor_msg - called to send a shost vendor unique message
> - *                      to a specific process id.
> - *
> - * @pid:		process id of the receiver
> - * @host_no:		host # sending the message
> - * @vendor_id:		unique identifier for the driver's vendor
> - * @data_len:		amount, in bytes, of vendor unique payload data
> - * @data_buf:		pointer to vendor unique data buffer
> - *
> - * Returns:
> - *   0 on successful return
> - *   otherwise, failing error code
> - *
> - * Notes:
> - *	This routine assumes no locks are held on entry.
> - */
> -int
> -scsi_nl_send_vendor_msg(u32 pid, unsigned short host_no, u64 vendor_id,
> -			 char *data_buf, u32 data_len)
> -{
> -	struct sk_buff *skb;
> -	struct nlmsghdr	*nlh;
> -	struct scsi_nl_host_vendor_msg *msg;
> -	u32 len, skblen;
> -	int err;
> -
> -	if (!scsi_nl_sock) {
> -		err = -ENOENT;
> -		goto send_vendor_fail;
> -	}
> -
> -	len = SCSI_NL_MSGALIGN(sizeof(*msg) + data_len);
> -	skblen = NLMSG_SPACE(len);
> -
> -	skb = alloc_skb(skblen, GFP_KERNEL);
> -	if (!skb) {
> -		err = -ENOBUFS;
> -		goto send_vendor_fail;
> -	}
> -
> -	nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
> -				skblen - sizeof(*nlh), 0);
> -	if (!nlh) {
> -		err = -ENOBUFS;
> -		goto send_vendor_fail_skb;
> -	}
> -	msg = NLMSG_DATA(nlh);
> -
> -	INIT_SCSI_NL_HDR(&msg->snlh, SCSI_NL_TRANSPORT,
> -				SCSI_NL_SHOST_VENDOR, len);
> -	msg->vendor_id = vendor_id;
> -	msg->host_no = host_no;
> -	msg->vmsg_datalen = data_len;	/* bytes */
> -	memcpy(&msg[1], data_buf, data_len);
> -
> -	err = nlmsg_unicast(scsi_nl_sock, skb, pid);
> -	if (err)
> -		/* nlmsg_multicast already kfree_skb'd */
> -		goto send_vendor_fail;
> -
> -	return 0;
> -
> -send_vendor_fail_skb:
> -	kfree_skb(skb);
> -send_vendor_fail:
> -	printk(KERN_WARNING
> -		"%s: Dropped SCSI Msg : host %d vendor_unique - err %d\n",
> -		__func__, host_no, err);
> -	return err;
> -}
> -EXPORT_SYMBOL(scsi_nl_send_vendor_msg);
> -
> -
> diff --git a/include/scsi/scsi_netlink.h b/include/scsi/scsi_netlink.h
> index 5cb20cc..62b4eda 100644
> --- a/include/scsi/scsi_netlink.h
> +++ b/include/scsi/scsi_netlink.h
> @@ -119,29 +119,5 @@ struct scsi_nl_host_vendor_msg {
>  	(hdr)->msglen = mlen;					\
>  	}
>  
> -
> -#ifdef __KERNEL__
> -
> -#include <scsi/scsi_host.h>
> -
> -/* Exported Kernel Interfaces */
> -int scsi_nl_add_transport(u8 tport,
> -	 int (*msg_handler)(struct sk_buff *),
> -	void (*event_handler)(struct notifier_block *, unsigned long, void *));
> -void scsi_nl_remove_transport(u8 tport);
> -
> -int scsi_nl_add_driver(u64 vendor_id, struct scsi_host_template *hostt,
> -	int (*nlmsg_handler)(struct Scsi_Host *shost, void *payload,
> -				 u32 len, u32 pid),
> -	void (*nlevt_handler)(struct notifier_block *nb,
> -				 unsigned long event, void *notify_ptr));
> -void scsi_nl_remove_driver(u64 vendor_id);
> -
> -void scsi_nl_send_transport_msg(u32 pid, struct scsi_nl_hdr *hdr);
> -int scsi_nl_send_vendor_msg(u32 pid, unsigned short host_no, u64 vendor_id,
> -			 char *data_buf, u32 data_len);
> -
> -#endif /* __KERNEL__ */
> -
>  #endif /* SCSI_NETLINK_H */
>  
> -- 
> 1.7.5.4
> 
--
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