1 files changed, 16 insertions, 541 deletions

diff --git a/drivers/scsi/scsi_netlink.c b/drivers/scsi/scsi_netlink.c
index 8818dd681c19..65123a21b97e 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);
+					     &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);
-
-